From 5c038f0427f231d5305b32ce8be99fe35f84e82e Mon Sep 17 00:00:00 2001
From: Jan Andrle <andrle.jan@centrum.cz>
Date: Wed, 8 Nov 2023 18:53:22 +0100
Subject: [PATCH] :hammer: mainly types + :boom: ddePublicElementTagNameMap

---
 dist/dde-with-signals.js            | 16 ++++-----
 dist/esm-with-signals.d.ts          | 54 +++++++++++++++++++++++++++--
 dist/esm-with-signals.js            |  8 ++---
 dist/esm.d.ts                       | 38 ++++++++++++++++++--
 docs/elements.html                  | 14 ++++----
 docs/index.html                     |  4 +--
 docs_src/types.d.ts                 |  6 ++++
 examples/components/webComponent.js | 37 ++++++++------------
 examples/index.js                   |  2 +-
 index.d.ts                          | 38 ++++++++++++++++++--
 signals.d.ts                        | 16 ++++++++-
 src/signals-lib.js                  | 16 +++++++--
 12 files changed, 195 insertions(+), 54 deletions(-)

diff --git a/dist/dde-with-signals.js b/dist/dde-with-signals.js
index fe68e7e..6b84714 100644
--- a/dist/dde-with-signals.js
+++ b/dist/dde-with-signals.js
@@ -1,22 +1,22 @@
 //deka-dom-el library is available via global namespace `dde`
 (()=> {
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n="attributeChanged";return typeof e!="object"&&(e={}),function(r){let c="dde:"+n;if(r.addEventListener(c,t,e),r.__dde_lifecycleToEvents||ot.has(r))return r;let s=new MutationObserver(function(d){for(let{attributeName:l,target:x}of d)x.dispatchEvent(new CustomEvent(c,{detail:[l,x.getAttribute(l)]}))});return C(e.signal,()=>s.disconnect())&&s.observe(r,{attributes:!0}),r}};function ct(){let t=new Map,e=!1,n=new MutationObserver(function(i){for(let u of i)if(u.type==="childList"){if(l(u.addedNodes,!0)){s();continue}x(u.removedNodes,!0)&&s()}});return{onConnected(i,u){c();let f=r(i);f.connected.has(u)||(f.connected.add(u),f.length_c+=1)},offConnected(i,u){if(!t.has(i))return;let f=t.get(i);f.connected.has(u)&&(f.connected.delete(u),f.length_c-=1,o(i,f))},onDisconnected(i,u){c();let f=r(i);f.disconnected.has(u)||(f.disconnected.add(u),f.length_d+=1)},offDisconnected(i,u){if(!t.has(i))return;let f=t.get(i);f.disconnected.has(u)&&(f.disconnected.delete(u),f.length_d-=1,o(i,f))}};function o(i,u){u.length_c||u.length_d||(t.delete(i),s())}function r(i){if(t.has(i))return t.get(i);let u={connected:new WeakSet,length_c:0,disconnected:new WeakSet,length_d:0};return t.set(i,u),u}function c(){e||(e=!0,n.observe(document.body,{childList:!0,subtree:!0}))}function s(){!e||t.size||(e=!1,n.disconnect())}function a(){return new Promise(function(i){(requestIdleCallback||requestAnimationFrame)(i)})}async function d(i){t.size>30&&await a();let u=[];if(!(i instanceof Node))return u;for(let f of t.keys())f===i||!(f instanceof Node)||i.contains(f)&&u.push(f);return u}function l(i,u){let f=!1;for(let b of i){if(u&&d(b).then(l),!t.has(b))continue;let S=t.get(b);S.length_c&&(b.dispatchEvent(new Event("dde:connected")),S.connected=new WeakSet,S.length_c=0,S.length_d||t.delete(b),f=!0)}return f}function x(i,u){let f=!1;for(let b of i)u&&d(b).then(x),!(!t.has(b)||!t.get(b).length_d)&&(b.dispatchEvent(new Event("dde:disconnected")),t.delete(b),f=!0);return f}}var p=Symbol.for("Signal");function D(t){try{return Reflect.has(t,p)}catch{return!1}}var T=[],h=new WeakMap;function g(t,e){if(typeof t!="function")return V(t,e);if(D(t))return t;let n=V(),o=function(){let[r,...c]=h.get(o);if(h.set(o,new Set([r])),T.push(o),n(t()),T.pop(),!c.length)return;let s=h.get(o);for(let a of c)s.has(a)||O(a,o)};return h.set(n[p],o),h.set(o,new Set([n])),o(),n}g.action=function(t,e,...n){let o=t[p],{actions:r}=o;if(!r||!Reflect.has(r,e))throw new Error(`'${t}' has no action with name '${e}'!`);if(r[e].apply(o,n),o.skip)return Reflect.deleteProperty(o,"skip");o.listeners.forEach(c=>c(o.value))};g.on=function t(e,n,o={}){let{signal:r}=o;if(!(r&&r.aborted)){if(Array.isArray(e))return e.forEach(c=>t(c,n,o));z(e,n),r&&r.addEventListener("abort",()=>O(e,n))}};g.symbols={signal:p,onclear:Symbol.for("Signal.onclear")};var A="__dde_attributes";g.attribute=function(t,e=void 0){let n=g(e),o;return E.host(r=>{if(o=r,r instanceof HTMLElement?r.hasAttribute(t)&&n(r.getAttribute(t)):r.hasAttributeNS(null,t)&&n(r.getAttributeNS(null,t)),r[A]){r[A][t]=n;return}return r[A]={[t]:n},m.attributeChanged(function({detail:s}){/*! This maps attributes to signals (`S.attribute`).
+* Investigate `__dde_attributes` key of the element.*/let[a,d]=s,l=r[A][a];if(l)return l(d)})(r),m.disconnected(function(){/*! This removes all signals mapped to attributes (`S.attribute`).
+* Investigate `__dde_attributes` key of the element.*/g.clear(...Object.values(r[A])),o=null})(r),r}),new Proxy(n,{apply(r,c,s){if(!s.length)return r();if(!o)return;let a=s[0];return o instanceof HTMLElement?o.setAttribute(t,a):o.setAttributeNS(null,t,a)}})};g.clear=function(...t){for(let n of t){Reflect.deleteProperty(n,"toJSON");let o=n[p];o.onclear.forEach(r=>r.call(o)),e(n,o),Reflect.deleteProperty(n,p)}function e(n,o){o.listeners.forEach(r=>{if(o.listeners.delete(r),!h.has(r))return;let c=h.get(r);c.delete(n),!(c.size>1)&&(g.clear(...c),h.delete(r))})}};var k="__dde_reactive";g.el=function(t,e){let n=v.mark({type:"reactive"},!1),o=n.end,r=document.createDocumentFragment();r.append(n,o);let{current:c}=E,s=a=>{if(!n.parentNode||!o.parentNode)return O(t,s);E.push(c);let d=e(a);E.pop(),Array.isArray(d)||(d=[d]);let l=n;for(;(l=n.nextSibling)!==o;)l.remove();n.after(...d)};return z(t,s),Q(t,s,n,e),s(t()),r};var K={isSignal:D,processReactiveAttribute(t,e,n,o){if(!D(n))return n;let r=c=>o(e,c);return z(n,r),Q(n,r,t,e),n()}};function Q(t,e,...n){let{current:o}=E;o.prevent||o.host(function(r){r[k]||(r[k]=[],m.disconnected(()=>r[k].forEach(([[c,s]])=>O(c,s,c[p]?.host()===r)))(r)),r[k].push([[t,e],...n])})}function V(t,e){let n=(...o)=>o.length?at(n,...o):ft(n);return it(n,t,e)}var st=Object.assign(Object.create(null),{stopPropagation(){this.skip=!0}}),$=class extends Error{constructor(){super();let[e,...n]=this.stack.split(`
+`),o=e.slice(e.indexOf("@"),e.indexOf(".js:")+4);this.stack=n.find(r=>!r.includes(o))}};function it(t,e,n){let o=[];F(n)!=="[object Object]"&&(n={});let{onclear:r}=g.symbols;n[r]&&(o.push(n[r]),Reflect.deleteProperty(n,r));let{host:c}=E;return Reflect.defineProperty(t,p,{value:{value:e,actions:n,onclear:o,host:c,listeners:new Set,defined:new $},enumerable:!1,writable:!1,configurable:!0}),t.toJSON=()=>t(),Object.setPrototypeOf(t[p],st),t}function ut(){return T[T.length-1]}function ft(t){if(!t[p])return;let{value:e,listeners:n}=t[p],o=ut();return o&&n.add(o),h.has(o)&&h.get(o).add(t),e}function at(t,e,n){if(!t[p])return;let o=t[p];if(!(!n&&o.value===e))return o.value=e,o.listeners.forEach(r=>r(e)),e}function z(t,e){if(t[p])return t[p].listeners.add(e)}function O(t,e,n){let o=t[p];if(!o)return;let r=o.listeners.delete(e);if(n&&!o.listeners.size){if(g.clear(t),!h.has(o))return r;let c=h.get(o);if(!h.has(c))return r;h.get(c).forEach(s=>O(s,c,!0))}return r}M(K);
 globalThis.dde= {S: g,
 assign: N,
 assignAttribute: I,
 classListDeclarative: Y,
-createElement: m,
+createElement: v,
 createElementNS: bt,
 dispatchEvent: xt,
-el: m,
+el: v,
 elNS: bt,
 empty: _t,
 isSignal: D,
-on: v,
-registerReactivity: W,
+on: m,
+registerReactivity: M,
 scope: E
 };
 
diff --git a/dist/esm-with-signals.d.ts b/dist/esm-with-signals.d.ts
index 1484306..250b8a3 100644
--- a/dist/esm-with-signals.d.ts
+++ b/dist/esm-with-signals.d.ts
@@ -1,9 +1,14 @@
 type CustomElementTagNameMap= { '#text': Text, '#comment': Comment }
+declare global {
+	interface ddePublicElementTagNameMap{
+	}
+}
 type SupportedElement=
 	  HTMLElementTagNameMap[keyof HTMLElementTagNameMap]
 	| SVGElementTagNameMap[keyof SVGElementTagNameMap]
 	| MathMLElementTagNameMap[keyof MathMLElementTagNameMap]
-	| CustomElementTagNameMap[keyof CustomElementTagNameMap];
+	| CustomElementTagNameMap[keyof CustomElementTagNameMap]
+	| ddePublicElementTagNameMap[keyof ddePublicElementTagNameMap];
 declare global {
 	type ddeComponentAttributes= Record<any, any> | undefined | string;
 	type ddeElementModifier<El extends SupportedElement | DocumentFragment>= (element: El)=> El;
@@ -36,7 +41,7 @@ type AttrsModified= {
  */
 type ElementAttributes<T extends SupportedElement>= Omit<T,keyof AttrsModified> & AttrsModified;
 export function assign<El extends SupportedElement>(element: El, ...attrs_array: Partial<ElementAttributes<El>>[]): El
-type ExtendedHTMLElementTagNameMap= HTMLElementTagNameMap & CustomElementTagNameMap
+type ExtendedHTMLElementTagNameMap= HTMLElementTagNameMap & CustomElementTagNameMap & ddePublicElementTagNameMap
 export function el<TAG extends keyof ExtendedHTMLElementTagNameMap>(
 	tag_name: TAG,
 	attrs?: string | Partial<ElementAttributes<ExtendedHTMLElementTagNameMap[TAG]>>,
@@ -81,6 +86,7 @@ export function elNS(
 export function dispatchEvent(element: SupportedElement, name: keyof DocumentEventMap): void;
 export function dispatchEvent(element: SupportedElement, name: string, data: any): void;
 interface On{
+	/** Listens to the DOM event. See {@link Document.addEventListener} */
 	<
 		EE extends ddeElementModifier<SupportedElement>,
 		El extends ( EE extends ddeElementModifier<infer El> ? El : never ),
@@ -89,6 +95,7 @@ interface On{
 			listener: (this: El, ev: DocumentEventMap[Event]) => any,
 			options?: AddEventListenerOptions
 		) : EE;
+	/** Listens to the element is connected to the live DOM. In case of custom elements uses [`connectedCallback`](https://developer.mozilla.org/en-US/docs/Web/API/Web_components/Using_custom_elements#custom_element_lifecycle_callbacks), or {@link MutationObserver} else where */
 	connected<
 		EE extends ddeElementModifier<SupportedElement>,
 		El extends ( EE extends ddeElementModifier<infer El> ? El : never )
@@ -96,6 +103,7 @@ interface On{
 			listener: (el: El) => any,
 			options?: AddEventListenerOptions
 		) : EE;
+	/** Listens to the element is disconnected from the live DOM. In case of custom elements uses [`disconnectedCallback`](https://developer.mozilla.org/en-US/docs/Web/API/Web_components/Using_custom_elements#custom_element_lifecycle_callbacks), or {@link MutationObserver} else where */
 	disconnected<
 		EE extends ddeElementModifier<SupportedElement>,
 		El extends ( EE extends ddeElementModifier<infer El> ? El : never )
@@ -103,10 +111,36 @@ interface On{
 			listener: (el: El) => any,
 			options?: AddEventListenerOptions
 		) : EE;
+	/** Listens to the element attribute changes. In case of custom elements uses [`attributeChangedCallback`](https://developer.mozilla.org/en-US/docs/Web/API/Web_components/Using_custom_elements#custom_element_lifecycle_callbacks), or {@link MutationObserver} else where */
+	attributeChanged<
+		EE extends ddeElementModifier<SupportedElement>,
+		El extends ( EE extends ddeElementModifier<infer El> ? El : never )
+		>(
+			listener: (el: El) => any,
+			options?: AddEventListenerOptions
+		) : EE;
 }
 export const on: On;
+type Scope= { scope: Node | Function | Object, host: ddeElementModifier<any>, prevent: boolean }
+/** Current scope created last time the `el(Function)` was invoke. (Or {@link scope.push}) */
 export const scope: {
+	current: Scope,
+	/** Stops all automatizations. E. g. signals used as attributes in current scope
+	 * registers removing these listeners (and clean signal if no other listeners are detected)
+	 * on `disconnected` event. */
+	preventDefault<T extends boolean>(prevent: T): T,
+	/**
+	 * This represents reference to the current host element — `scope.host()`.
+	 * It can be also used to register Modifier (function to be called when component is initized)
+	 * — `scope.host(on.connected(console.log))`.
+	 * */
 	host: ddeElementModifier<any>,
+	
+	state: Scope[],
+	/** Adds new child scope. All attributes are inherited by default. */
+	push(scope: Partial<Scope>): ReturnType<Array<Scope>["push"]>
+	/** Removes last/current child scope. */
+	pop(): ReturnType<Array<Scope>["pop"]>
 };
 /*
  * TODO TypeScript HACK (better way?)
@@ -430,6 +464,10 @@ interface S {
 	 *		by `S.clear`.
 	 * */
 	<V, A extends Actions<V>>(value: V, actions?: A): Signal<V, A>;
+	/**
+	 * Computations signal. This creates a signal which is computed from other signals.
+	 * */
+	<V>(computation: ()=> V): Signal<V, {}>
 	action<S extends Signal<any, Actions<any>>, A extends (S extends Signal<any, infer A> ? A : never), N extends keyof A>(
 		signal: S,
 		name: N,
@@ -441,7 +479,17 @@ interface S {
 		signal: SymbolSignal;
 		onclear: SymbolOnclear;
 	}
-	el<S extends any, T extends HTMLElement>(signal: Signal<S, any>, el: (v: S)=> T): T;
+	/**
+	 * Reactive element, which is rendered based on the given signal.
+	 * ```js
+	 * S.el(signal, value=> value ? el("b", "True") : el("i", "False"));
+	 * S.el(listS, list=> list.map(li=> el("li", li)));
+	 * ```
+	 * */
+	el<S extends any>(signal: Signal<S, any>, el: (v: S)=> Element | Element[]): DocumentFragment;
+
+	/** Mirrors element attributes for current host (both way).  */
+	attribute<T>(name: string, initial?: T): Signal<T, {}>
 }
 export const S: S;
 declare global {
diff --git a/dist/esm-with-signals.js b/dist/esm-with-signals.js
index d2ff843..9291246 100644
--- a/dist/esm-with-signals.js
+++ b/dist/esm-with-signals.js
@@ -1,4 +1,4 @@
-var y={isSignal(t){return!1},processReactiveAttribute(t,e,n,r){return n}};function W(t,e=!0){return e?Object.assign(y,t):(Object.setPrototypeOf(t,y),t)}function R(t){return y.isPrototypeOf(t)&&t!==y?t:y}function _(t){return typeof t>"u"}function F(t){let e=typeof t;return e!=="object"?e:t===null?"null":Object.prototype.toString.call(t)}function C(t,e){if(!t||!(t instanceof AbortSignal))return!0;if(!t.aborted)return t.addEventListener("abort",e),function(){t.removeEventListener("abort",e)}}var U={setDeleteAttr:X};function X(t,e,n){if(Reflect.set(t,e,n),!!_(n)){if(Reflect.deleteProperty(t,e),t instanceof HTMLElement&&t.getAttribute(e)==="undefined")return t.removeAttribute(e);if(Reflect.get(t,e)==="undefined")return Reflect.set(t,e,"")}}var w=[{scope:document.body,host:t=>t?t(document.body):document.body,prevent:!0}],E={get current(){return w[w.length-1]},get host(){return this.current.host},preventDefault(){let{current:t}=this;return t.prevent=!0,t},get state(){return[...w]},push(t={}){return w.push(Object.assign({},this.current,{prevent:!1},t))},pop(){return w.pop()}},L;function m(t,e,...n){let r=R(this),o=0,c,s;switch((Object(e)!==e||r.isSignal(e))&&(e={textContent:e}),!0){case typeof t=="function":{o=1,E.push({scope:t,host:h=>h?(o===1?n.unshift(h):h(s),void 0):s}),c=t(e||void 0);let d=c instanceof DocumentFragment,a=m.mark({type:"component",name:t.name,host:d?"this":c.nodeName==="#comment"?"previousLater":"parentElement"});c.prepend(a),d&&(s=a);break}case t==="#text":c=N.call(this,document.createTextNode(""),e);break;case(t==="<>"||!t):c=N.call(this,document.createDocumentFragment(),e);break;case L:c=N.call(this,document.createElementNS(L,t),e);break;case!c:c=N.call(this,document.createElement(t),e)}return rt(c),s||(s=c),n.forEach(d=>d(s)),o&&E.pop(),o=2,c}m.mark=function(t,e=!1){t=Object.entries(t).map(([o,c])=>o+`="${c}"`).join(" ");let n=e?"":"/",r=document.createComment(`<dde:mark ${t}${n}>`);return e||(r.end=document.createComment("</dde:mark>")),r};m.later=function(){let t=m.mark({type:"later"});return t.append=t.prepend=function(...e){return t.after(...e),t},t};function bt(t){let e=this;return function(...r){L=t;let o=m.call(e,...r);return L=void 0,o}}var{setDeleteAttr:q}=U,j=new WeakMap;function N(t,...e){if(!e.length)return t;j.set(t,J(t,this));for(let[n,r]of Object.entries(Object.assign({},...e)))I.call(this,t,n,r);return j.delete(t),t}function I(t,e,n){let{setRemoveAttr:r,s:o}=J(t,this),c=this;n=o.processReactiveAttribute(t,e,n,(d,a)=>I.call(c,t,d,a));let[s]=e;if(s==="=")return r(e.slice(1),n);if(s===".")return B(t,e.slice(1),n);if(/(aria|data)([A-Z])/.test(e))return e=e.replace(/([a-z])([A-Z])/g,"$1-$2").toLowerCase(),r(e,n);switch(e==="className"&&(e="class"),e){case"xlink:href":return r(e,n,"http://www.w3.org/1999/xlink");case"textContent":return q(t,e,n);case"style":if(typeof n!="object")break;case"dataset":return M(o,n,B.bind(null,t[e]));case"ariaset":return M(o,n,(d,a)=>r("aria-"+d,a));case"classList":return Y.call(c,t,n)}return tt(t,e)?q(t,e,n):r(e,n)}function J(t,e){if(j.has(t))return j.get(t);let r=(t instanceof SVGElement?nt:et).bind(null,t,"Attribute"),o=R(e);return{setRemoveAttr:r,s:o}}function Y(t,e){let n=R(this);return M(n,e,(r,o)=>t.classList.toggle(r,o===-1?void 0:!!o)),t}function _t(t){return Array.from(t.children).forEach(e=>e.remove()),t}function tt(t,e){if(!Reflect.has(t,e))return!1;let n=Z(t,e);return!_(n.set)}function Z(t,e){if(t=Object.getPrototypeOf(t),!t)return{};let n=Object.getOwnPropertyDescriptor(t,e);return n||Z(t,e)}function M(t,e,n){if(!(typeof e!="object"||e===null))return Object.entries(e).forEach(function([o,c]){o&&(c=t.processReactiveAttribute(e,o,c,n),n(o,c))})}function G(t){return Array.isArray(t)?t.filter(Boolean).join(" "):t}function et(t,e,n,r){return t[(_(r)?"remove":"set")+e](n,G(r))}function nt(t,e,n,r,o=null){return t[(_(r)?"remove":"set")+e+"NS"](o,n,G(r))}function B(t,e,n){if(Reflect.set(t,e,n),!!_(n))return Reflect.deleteProperty(t,e)}function H(...t){return this.appendOrig(...t),this}function rt(t){return t.append===H||(t.appendOrig=t.append,t.append=H),t}function xt(t,e,...n){let r=n.length?new CustomEvent(e,{detail:n[0]}):new Event(e);return t.dispatchEvent(r)}function v(t,e,n){return function(o){return o.addEventListener(t,e,n),o}}var P=ct(),ot=new WeakSet;v.connected=function(t,e){let n="connected";return typeof e!="object"&&(e={}),e.once=!0,function(o){let c="dde:"+n;return o.addEventListener(c,t,e),o.__dde_lifecycleToEvents?o:o.isConnected?(o.dispatchEvent(new Event(c)),o):(C(e.signal,()=>P.offConnected(o,t))&&P.onConnected(o,t),o)}};v.disconnected=function(t,e){let n="disconnected";return typeof e!="object"&&(e={}),e.once=!0,function(o){let c="dde:"+n;return o.addEventListener(c,t,e),o.__dde_lifecycleToEvents||C(e.signal,()=>P.offDisconnected(o,t))&&P.onDisconnected(o,t),o}};v.attributeChanged=function(t,e){let n="attributeChanged";return typeof e!="object"&&(e={}),function(o){let c="dde:"+n;if(o.addEventListener(c,t,e),o.__dde_lifecycleToEvents||ot.has(o))return o;let s=new MutationObserver(function(a){for(let{attributeName:h,target:x}of a)x.dispatchEvent(new CustomEvent(c,{detail:[h,x.getAttribute(h)]}))});return C(e.signal,()=>s.disconnect())&&s.observe(o,{attributes:!0}),o}};function ct(){let t=new Map,e=!1,n=new MutationObserver(function(i){for(let u of i)if(u.type==="childList"){if(h(u.addedNodes,!0)){s();continue}x(u.removedNodes,!0)&&s()}});return{onConnected(i,u){c();let f=o(i);f.connected.has(u)||(f.connected.add(u),f.length_c+=1)},offConnected(i,u){if(!t.has(i))return;let f=t.get(i);f.connected.has(u)&&(f.connected.delete(u),f.length_c-=1,r(i,f))},onDisconnected(i,u){c();let f=o(i);f.disconnected.has(u)||(f.disconnected.add(u),f.length_d+=1)},offDisconnected(i,u){if(!t.has(i))return;let f=t.get(i);f.disconnected.has(u)&&(f.disconnected.delete(u),f.length_d-=1,r(i,f))}};function r(i,u){u.length_c||u.length_d||(t.delete(i),s())}function o(i){if(t.has(i))return t.get(i);let u={connected:new WeakSet,length_c:0,disconnected:new WeakSet,length_d:0};return t.set(i,u),u}function c(){e||(e=!0,n.observe(document.body,{childList:!0,subtree:!0}))}function s(){!e||t.size||(e=!1,n.disconnect())}function d(){return new Promise(function(i){(requestIdleCallback||requestAnimationFrame)(i)})}async function a(i){t.size>30&&await d();let u=[];if(!(i instanceof Node))return u;for(let f of t.keys())f===i||!(f instanceof Node)||i.contains(f)&&u.push(f);return u}function h(i,u){let f=!1;for(let b of i){if(u&&a(b).then(h),!t.has(b))continue;let S=t.get(b);S.length_c&&(b.dispatchEvent(new Event("dde:connected")),S.connected=new WeakSet,S.length_c=0,S.length_d||t.delete(b),f=!0)}return f}function x(i,u){let f=!1;for(let b of i)u&&a(b).then(x),!(!t.has(b)||!t.get(b).length_d)&&(b.dispatchEvent(new Event("dde:disconnected")),t.delete(b),f=!0);return f}}var p=Symbol.for("Signal");function D(t){try{return Reflect.has(t,p)}catch{return!1}}var T=[],l=new WeakMap;function g(t,e){if(typeof t!="function")return V(t,e);if(D(t))return t;let n=V(),r=function(){let[o,...c]=l.get(r);if(l.set(r,new Set([o])),T.push(r),n(t()),T.pop(),!c.length)return;let s=l.get(r);for(let d of c)s.has(d)||O(d,r)};return l.set(n[p],r),l.set(r,new Set([n])),r(),n}g.action=function(t,e,...n){let r=t[p],{actions:o}=r;if(!o||!Reflect.has(o,e))throw new Error(`'${t}' has no action with name '${e}'!`);if(o[e].apply(r,n),r.skip)return Reflect.deleteProperty(r,"skip");r.listeners.forEach(c=>c(r.value))};g.on=function t(e,n,r={}){let{signal:o}=r;if(!(o&&o.aborted)){if(Array.isArray(e))return e.forEach(c=>t(c,n,r));z(e,n),o&&o.addEventListener("abort",()=>O(e,n))}};g.symbols={signal:p,onclear:Symbol.for("Signal.onclear")};var A="__dde_attributes";g.attribute=function(t,e=void 0){let n=g(e);return E.host(r=>{if(r instanceof 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-`),r=e.slice(e.indexOf("@"),e.indexOf(".js:")+4);this.stack=n.find(o=>!o.includes(r))}};function it(t,e,n){let r=[];F(n)!=="[object Object]"&&(n={});let{onclear:o}=g.symbols;n[o]&&(r.push(n[o]),Reflect.deleteProperty(n,o));let{host:c}=E;return Reflect.defineProperty(t,p,{value:{value:e,actions:n,onclear:r,host:c,listeners:new Set,defined:new $},enumerable:!1,writable:!1,configurable:!0}),t.toJSON=()=>t(),Object.setPrototypeOf(t[p],st),t}function ut(){return T[T.length-1]}function ft(t){if(!t[p])return;let{value:e,listeners:n}=t[p],r=ut();return r&&n.add(r),l.has(r)&&l.get(r).add(t),e}function at(t,e,n){if(!t[p])return;let r=t[p];if(!(!n&&r.value===e))return r.value=e,r.listeners.forEach(o=>o(e)),e}function z(t,e){if(t[p])return t[p].listeners.add(e)}function O(t,e,n){let r=t[p];if(!r)return;let o=r.listeners.delete(e);if(n&&!r.listeners.size){if(g.clear(t),!l.has(r))return o;let c=l.get(r);if(!l.has(c))return o;l.get(c).forEach(s=>O(s,c,!0))}return o}W(K);export{g as S,N as assign,I as assignAttribute,Y as classListDeclarative,m as createElement,bt as createElementNS,xt as dispatchEvent,m as el,bt as elNS,_t as empty,D as isSignal,v as on,W as registerReactivity,E as scope};
+var y={isSignal(t){return!1},processReactiveAttribute(t,e,n,o){return n}};function M(t,e=!0){return e?Object.assign(y,t):(Object.setPrototypeOf(t,y),t)}function R(t){return y.isPrototypeOf(t)&&t!==y?t:y}function _(t){return typeof t>"u"}function F(t){let e=typeof t;return e!=="object"?e:t===null?"null":Object.prototype.toString.call(t)}function C(t,e){if(!t||!(t instanceof AbortSignal))return!0;if(!t.aborted)return t.addEventListener("abort",e),function(){t.removeEventListener("abort",e)}}var U={setDeleteAttr:X};function X(t,e,n){if(Reflect.set(t,e,n),!!_(n)){if(Reflect.deleteProperty(t,e),t instanceof HTMLElement&&t.getAttribute(e)==="undefined")return t.removeAttribute(e);if(Reflect.get(t,e)==="undefined")return Reflect.set(t,e,"")}}var w=[{scope:document.body,host:t=>t?t(document.body):document.body,prevent:!0}],E={get current(){return w[w.length-1]},get host(){return this.current.host},preventDefault(){let{current:t}=this;return t.prevent=!0,t},get state(){return[...w]},push(t={}){return w.push(Object.assign({},this.current,{prevent:!1},t))},pop(){return w.pop()}},L;function v(t,e,...n){let o=R(this),r=0,c,s;switch((Object(e)!==e||o.isSignal(e))&&(e={textContent:e}),!0){case typeof t=="function":{r=1,E.push({scope:t,host:l=>l?(r===1?n.unshift(l):l(s),void 0):s}),c=t(e||void 0);let a=c instanceof DocumentFragment,d=v.mark({type:"component",name:t.name,host:a?"this":c.nodeName==="#comment"?"previousLater":"parentElement"});c.prepend(d),a&&(s=d);break}case t==="#text":c=N.call(this,document.createTextNode(""),e);break;case(t==="<>"||!t):c=N.call(this,document.createDocumentFragment(),e);break;case L:c=N.call(this,document.createElementNS(L,t),e);break;case!c:c=N.call(this,document.createElement(t),e)}return rt(c),s||(s=c),n.forEach(a=>a(s)),r&&E.pop(),r=2,c}v.mark=function(t,e=!1){t=Object.entries(t).map(([r,c])=>r+`="${c}"`).join(" ");let n=e?"":"/",o=document.createComment(`<dde:mark ${t}${n}>`);return e||(o.end=document.createComment("</dde:mark>")),o};v.later=function(){let t=v.mark({type:"later"});return t.append=t.prepend=function(...e){return t.after(...e),t},t};function bt(t){let e=this;return function(...o){L=t;let r=v.call(e,...o);return L=void 0,r}}var{setDeleteAttr:q}=U,j=new WeakMap;function N(t,...e){if(!e.length)return t;j.set(t,J(t,this));for(let[n,o]of Object.entries(Object.assign({},...e)))I.call(this,t,n,o);return j.delete(t),t}function I(t,e,n){let{setRemoveAttr:o,s:r}=J(t,this),c=this;n=r.processReactiveAttribute(t,e,n,(a,d)=>I.call(c,t,a,d));let[s]=e;if(s==="=")return o(e.slice(1),n);if(s===".")return H(t,e.slice(1),n);if(/(aria|data)([A-Z])/.test(e))return e=e.replace(/([a-z])([A-Z])/g,"$1-$2").toLowerCase(),o(e,n);switch(e==="className"&&(e="class"),e){case"xlink:href":return o(e,n,"http://www.w3.org/1999/xlink");case"textContent":return q(t,e,n);case"style":if(typeof n!="object")break;case"dataset":return W(r,n,H.bind(null,t[e]));case"ariaset":return W(r,n,(a,d)=>o("aria-"+a,d));case"classList":return Y.call(c,t,n)}return tt(t,e)?q(t,e,n):o(e,n)}function J(t,e){if(j.has(t))return j.get(t);let o=(t instanceof SVGElement?nt:et).bind(null,t,"Attribute"),r=R(e);return{setRemoveAttr:o,s:r}}function Y(t,e){let n=R(this);return W(n,e,(o,r)=>t.classList.toggle(o,r===-1?void 0:!!r)),t}function _t(t){return Array.from(t.children).forEach(e=>e.remove()),t}function tt(t,e){if(!Reflect.has(t,e))return!1;let n=Z(t,e);return!_(n.set)}function Z(t,e){if(t=Object.getPrototypeOf(t),!t)return{};let n=Object.getOwnPropertyDescriptor(t,e);return n||Z(t,e)}function W(t,e,n){if(!(typeof e!="object"||e===null))return Object.entries(e).forEach(function([r,c]){r&&(c=t.processReactiveAttribute(e,r,c,n),n(r,c))})}function G(t){return Array.isArray(t)?t.filter(Boolean).join(" "):t}function et(t,e,n,o){return t[(_(o)?"remove":"set")+e](n,G(o))}function nt(t,e,n,o,r=null){return t[(_(o)?"remove":"set")+e+"NS"](r,n,G(o))}function H(t,e,n){if(Reflect.set(t,e,n),!!_(n))return Reflect.deleteProperty(t,e)}function B(...t){return this.appendOrig(...t),this}function rt(t){return t.append===B||(t.appendOrig=t.append,t.append=B),t}function xt(t,e,...n){let o=n.length?new CustomEvent(e,{detail:n[0]}):new Event(e);return t.dispatchEvent(o)}function m(t,e,n){return function(r){return r.addEventListener(t,e,n),r}}var P=ct(),ot=new WeakSet;m.connected=function(t,e){let n="connected";return typeof e!="object"&&(e={}),e.once=!0,function(r){let c="dde:"+n;return r.addEventListener(c,t,e),r.__dde_lifecycleToEvents?r:r.isConnected?(r.dispatchEvent(new Event(c)),r):(C(e.signal,()=>P.offConnected(r,t))&&P.onConnected(r,t),r)}};m.disconnected=function(t,e){let n="disconnected";return typeof e!="object"&&(e={}),e.once=!0,function(r){let c="dde:"+n;return r.addEventListener(c,t,e),r.__dde_lifecycleToEvents||C(e.signal,()=>P.offDisconnected(r,t))&&P.onDisconnected(r,t),r}};m.attributeChanged=function(t,e){let n="attributeChanged";return typeof e!="object"&&(e={}),function(r){let c="dde:"+n;if(r.addEventListener(c,t,e),r.__dde_lifecycleToEvents||ot.has(r))return r;let s=new MutationObserver(function(d){for(let{attributeName:l,target:x}of d)x.dispatchEvent(new CustomEvent(c,{detail:[l,x.getAttribute(l)]}))});return C(e.signal,()=>s.disconnect())&&s.observe(r,{attributes:!0}),r}};function ct(){let t=new Map,e=!1,n=new MutationObserver(function(i){for(let u of i)if(u.type==="childList"){if(l(u.addedNodes,!0)){s();continue}x(u.removedNodes,!0)&&s()}});return{onConnected(i,u){c();let f=r(i);f.connected.has(u)||(f.connected.add(u),f.length_c+=1)},offConnected(i,u){if(!t.has(i))return;let f=t.get(i);f.connected.has(u)&&(f.connected.delete(u),f.length_c-=1,o(i,f))},onDisconnected(i,u){c();let f=r(i);f.disconnected.has(u)||(f.disconnected.add(u),f.length_d+=1)},offDisconnected(i,u){if(!t.has(i))return;let f=t.get(i);f.disconnected.has(u)&&(f.disconnected.delete(u),f.length_d-=1,o(i,f))}};function o(i,u){u.length_c||u.length_d||(t.delete(i),s())}function r(i){if(t.has(i))return t.get(i);let u={connected:new WeakSet,length_c:0,disconnected:new WeakSet,length_d:0};return t.set(i,u),u}function c(){e||(e=!0,n.observe(document.body,{childList:!0,subtree:!0}))}function s(){!e||t.size||(e=!1,n.disconnect())}function a(){return new Promise(function(i){(requestIdleCallback||requestAnimationFrame)(i)})}async function d(i){t.size>30&&await a();let u=[];if(!(i instanceof Node))return u;for(let f of t.keys())f===i||!(f instanceof Node)||i.contains(f)&&u.push(f);return u}function l(i,u){let f=!1;for(let b of i){if(u&&d(b).then(l),!t.has(b))continue;let S=t.get(b);S.length_c&&(b.dispatchEvent(new Event("dde:connected")),S.connected=new WeakSet,S.length_c=0,S.length_d||t.delete(b),f=!0)}return f}function x(i,u){let f=!1;for(let b of i)u&&d(b).then(x),!(!t.has(b)||!t.get(b).length_d)&&(b.dispatchEvent(new Event("dde:disconnected")),t.delete(b),f=!0);return f}}var p=Symbol.for("Signal");function D(t){try{return Reflect.has(t,p)}catch{return!1}}var T=[],h=new WeakMap;function g(t,e){if(typeof t!="function")return V(t,e);if(D(t))return t;let n=V(),o=function(){let[r,...c]=h.get(o);if(h.set(o,new Set([r])),T.push(o),n(t()),T.pop(),!c.length)return;let s=h.get(o);for(let a of c)s.has(a)||O(a,o)};return h.set(n[p],o),h.set(o,new Set([n])),o(),n}g.action=function(t,e,...n){let o=t[p],{actions:r}=o;if(!r||!Reflect.has(r,e))throw new Error(`'${t}' has no action with name '${e}'!`);if(r[e].apply(o,n),o.skip)return Reflect.deleteProperty(o,"skip");o.listeners.forEach(c=>c(o.value))};g.on=function t(e,n,o={}){let{signal:r}=o;if(!(r&&r.aborted)){if(Array.isArray(e))return e.forEach(c=>t(c,n,o));z(e,n),r&&r.addEventListener("abort",()=>O(e,n))}};g.symbols={signal:p,onclear:Symbol.for("Signal.onclear")};var A="__dde_attributes";g.attribute=function(t,e=void 0){let n=g(e),o;return E.host(r=>{if(o=r,r instanceof HTMLElement?r.hasAttribute(t)&&n(r.getAttribute(t)):r.hasAttributeNS(null,t)&&n(r.getAttributeNS(null,t)),r[A]){r[A][t]=n;return}return r[A]={[t]:n},m.attributeChanged(function({detail:s}){/*! This maps attributes to signals (`S.attribute`).
+* Investigate `__dde_attributes` key of the element.*/let[a,d]=s,l=r[A][a];if(l)return l(d)})(r),m.disconnected(function(){/*! This removes all signals mapped to attributes (`S.attribute`).
+* Investigate `__dde_attributes` key of the element.*/g.clear(...Object.values(r[A])),o=null})(r),r}),new Proxy(n,{apply(r,c,s){if(!s.length)return r();if(!o)return;let a=s[0];return o instanceof HTMLElement?o.setAttribute(t,a):o.setAttributeNS(null,t,a)}})};g.clear=function(...t){for(let n of t){Reflect.deleteProperty(n,"toJSON");let o=n[p];o.onclear.forEach(r=>r.call(o)),e(n,o),Reflect.deleteProperty(n,p)}function e(n,o){o.listeners.forEach(r=>{if(o.listeners.delete(r),!h.has(r))return;let c=h.get(r);c.delete(n),!(c.size>1)&&(g.clear(...c),h.delete(r))})}};var k="__dde_reactive";g.el=function(t,e){let n=v.mark({type:"reactive"},!1),o=n.end,r=document.createDocumentFragment();r.append(n,o);let{current:c}=E,s=a=>{if(!n.parentNode||!o.parentNode)return O(t,s);E.push(c);let d=e(a);E.pop(),Array.isArray(d)||(d=[d]);let l=n;for(;(l=n.nextSibling)!==o;)l.remove();n.after(...d)};return z(t,s),Q(t,s,n,e),s(t()),r};var K={isSignal:D,processReactiveAttribute(t,e,n,o){if(!D(n))return n;let r=c=>o(e,c);return z(n,r),Q(n,r,t,e),n()}};function Q(t,e,...n){let{current:o}=E;o.prevent||o.host(function(r){r[k]||(r[k]=[],m.disconnected(()=>r[k].forEach(([[c,s]])=>O(c,s,c[p]?.host()===r)))(r)),r[k].push([[t,e],...n])})}function V(t,e){let n=(...o)=>o.length?at(n,...o):ft(n);return it(n,t,e)}var st=Object.assign(Object.create(null),{stopPropagation(){this.skip=!0}}),$=class extends Error{constructor(){super();let[e,...n]=this.stack.split(`
+`),o=e.slice(e.indexOf("@"),e.indexOf(".js:")+4);this.stack=n.find(r=>!r.includes(o))}};function it(t,e,n){let o=[];F(n)!=="[object Object]"&&(n={});let{onclear:r}=g.symbols;n[r]&&(o.push(n[r]),Reflect.deleteProperty(n,r));let{host:c}=E;return Reflect.defineProperty(t,p,{value:{value:e,actions:n,onclear:o,host:c,listeners:new Set,defined:new $},enumerable:!1,writable:!1,configurable:!0}),t.toJSON=()=>t(),Object.setPrototypeOf(t[p],st),t}function ut(){return T[T.length-1]}function ft(t){if(!t[p])return;let{value:e,listeners:n}=t[p],o=ut();return o&&n.add(o),h.has(o)&&h.get(o).add(t),e}function at(t,e,n){if(!t[p])return;let o=t[p];if(!(!n&&o.value===e))return o.value=e,o.listeners.forEach(r=>r(e)),e}function z(t,e){if(t[p])return t[p].listeners.add(e)}function O(t,e,n){let o=t[p];if(!o)return;let r=o.listeners.delete(e);if(n&&!o.listeners.size){if(g.clear(t),!h.has(o))return r;let c=h.get(o);if(!h.has(c))return r;h.get(c).forEach(s=>O(s,c,!0))}return r}M(K);export{g as S,N as assign,I as assignAttribute,Y as classListDeclarative,v as createElement,bt as createElementNS,xt as dispatchEvent,v as el,bt as elNS,_t as empty,D as isSignal,m as on,M as registerReactivity,E as scope};
diff --git a/dist/esm.d.ts b/dist/esm.d.ts
index fde91c8..ec6d7ee 100644
--- a/dist/esm.d.ts
+++ b/dist/esm.d.ts
@@ -1,9 +1,14 @@
 type CustomElementTagNameMap= { '#text': Text, '#comment': Comment }
+declare global {
+	interface ddePublicElementTagNameMap{
+	}
+}
 type SupportedElement=
 	  HTMLElementTagNameMap[keyof HTMLElementTagNameMap]
 	| SVGElementTagNameMap[keyof SVGElementTagNameMap]
 	| MathMLElementTagNameMap[keyof MathMLElementTagNameMap]
-	| CustomElementTagNameMap[keyof CustomElementTagNameMap];
+	| CustomElementTagNameMap[keyof CustomElementTagNameMap]
+	| ddePublicElementTagNameMap[keyof ddePublicElementTagNameMap];
 declare global {
 	type ddeComponentAttributes= Record<any, any> | undefined | string;
 	type ddeElementModifier<El extends SupportedElement | DocumentFragment>= (element: El)=> El;
@@ -36,7 +41,7 @@ type AttrsModified= {
  */
 type ElementAttributes<T extends SupportedElement>= Omit<T,keyof AttrsModified> & AttrsModified;
 export function assign<El extends SupportedElement>(element: El, ...attrs_array: Partial<ElementAttributes<El>>[]): El
-type ExtendedHTMLElementTagNameMap= HTMLElementTagNameMap & CustomElementTagNameMap
+type ExtendedHTMLElementTagNameMap= HTMLElementTagNameMap & CustomElementTagNameMap & ddePublicElementTagNameMap
 export function el<TAG extends keyof ExtendedHTMLElementTagNameMap>(
 	tag_name: TAG,
 	attrs?: string | Partial<ElementAttributes<ExtendedHTMLElementTagNameMap[TAG]>>,
@@ -81,6 +86,7 @@ export function elNS(
 export function dispatchEvent(element: SupportedElement, name: keyof DocumentEventMap): void;
 export function dispatchEvent(element: SupportedElement, name: string, data: any): void;
 interface On{
+	/** Listens to the DOM event. See {@link Document.addEventListener} */
 	<
 		EE extends ddeElementModifier<SupportedElement>,
 		El extends ( EE extends ddeElementModifier<infer El> ? El : never ),
@@ -89,6 +95,7 @@ interface On{
 			listener: (this: El, ev: DocumentEventMap[Event]) => any,
 			options?: AddEventListenerOptions
 		) : EE;
+	/** Listens to the element is connected to the live DOM. In case of custom elements uses [`connectedCallback`](https://developer.mozilla.org/en-US/docs/Web/API/Web_components/Using_custom_elements#custom_element_lifecycle_callbacks), or {@link MutationObserver} else where */
 	connected<
 		EE extends ddeElementModifier<SupportedElement>,
 		El extends ( EE extends ddeElementModifier<infer El> ? El : never )
@@ -96,6 +103,7 @@ interface On{
 			listener: (el: El) => any,
 			options?: AddEventListenerOptions
 		) : EE;
+	/** Listens to the element is disconnected from the live DOM. In case of custom elements uses [`disconnectedCallback`](https://developer.mozilla.org/en-US/docs/Web/API/Web_components/Using_custom_elements#custom_element_lifecycle_callbacks), or {@link MutationObserver} else where */
 	disconnected<
 		EE extends ddeElementModifier<SupportedElement>,
 		El extends ( EE extends ddeElementModifier<infer El> ? El : never )
@@ -103,10 +111,36 @@ interface On{
 			listener: (el: El) => any,
 			options?: AddEventListenerOptions
 		) : EE;
+	/** Listens to the element attribute changes. In case of custom elements uses [`attributeChangedCallback`](https://developer.mozilla.org/en-US/docs/Web/API/Web_components/Using_custom_elements#custom_element_lifecycle_callbacks), or {@link MutationObserver} else where */
+	attributeChanged<
+		EE extends ddeElementModifier<SupportedElement>,
+		El extends ( EE extends ddeElementModifier<infer El> ? El : never )
+		>(
+			listener: (el: El) => any,
+			options?: AddEventListenerOptions
+		) : EE;
 }
 export const on: On;
+type Scope= { scope: Node | Function | Object, host: ddeElementModifier<any>, prevent: boolean }
+/** Current scope created last time the `el(Function)` was invoke. (Or {@link scope.push}) */
 export const scope: {
+	current: Scope,
+	/** Stops all automatizations. E. g. signals used as attributes in current scope
+	 * registers removing these listeners (and clean signal if no other listeners are detected)
+	 * on `disconnected` event. */
+	preventDefault<T extends boolean>(prevent: T): T,
+	/**
+	 * This represents reference to the current host element — `scope.host()`.
+	 * It can be also used to register Modifier (function to be called when component is initized)
+	 * — `scope.host(on.connected(console.log))`.
+	 * */
 	host: ddeElementModifier<any>,
+	
+	state: Scope[],
+	/** Adds new child scope. All attributes are inherited by default. */
+	push(scope: Partial<Scope>): ReturnType<Array<Scope>["push"]>
+	/** Removes last/current child scope. */
+	pop(): ReturnType<Array<Scope>["pop"]>
 };
 /*
  * TODO TypeScript HACK (better way?)
diff --git a/docs/elements.html b/docs/elements.html
index bf25588..9f6c143 100644
--- a/docs/elements.html
+++ b/docs/elements.html
@@ -1,4 +1,4 @@
-<!DOCTYPE html><html><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1"><link rel="stylesheet" href="elements.css"><meta name="description" content="Basic concepts of elements modifications and creations."><!--<dde:mark type="component" name="metaTwitter" host="this"/>--><meta name="twitter:card" content="summary_large_image"><meta name="twitter:url" content="https://github.com/jaandrle/deka-dom-el"><meta name="twitter:title" content="deka-dom-el"><meta name="twitter:description" content="A low-code library that simplifies the creation of native DOM elements/components using small wrappers and tweaks."><meta name="twitter:creator" content="@jaandrle"><!--<dde:mark type="component" name="metaFacebook" host="this"/>--><meta name="og:url" content="https://github.com/jaandrle/deka-dom-el"><meta name="og:title" content="deka-dom-el"><meta name="og:description" content="A low-code library that simplifies the creation of native DOM elements/components using small wrappers and tweaks."><meta name="og:creator" content="@jaandrle"><title>`deka-dom-el` — Elements</title><script src="https://flems.io/flems.html" type="text/javascript" charset="utf-8"></script></head><body><!--<dde:mark type="component" name="page" host="this"/>--><!--<dde:mark type="component" name="header" host="this"/>--><header><h1>`deka-dom-el` — Elements</h1><p>Basic concepts of elements modifications and creations.</p></header><nav><a href="https://github.com/jaandrle/deka-dom-el"><svg class="icon" viewbox="0 0 32 32"><!--<dde:mark type="component" name="iconGitHub" host="parentElement"/>--><path d="M 16,0.395c -8.836,0 -16,7.163 -16,16c 0,7.069 4.585,13.067 10.942,15.182c 0.8,0.148 1.094,-0.347 1.094,-0.77c 0,-0.381 -0.015,-1.642 -0.022,-2.979c -4.452,0.968 -5.391,-1.888 -5.391,-1.888c -0.728,-1.849 -1.776,-2.341 -1.776,-2.341c -1.452,-0.993 0.11,-0.973 0.11,-0.973c 1.606,0.113 2.452,1.649 2.452,1.649c 1.427,2.446 3.743,1.739 4.656,1.33c 0.143,-1.034 0.558,-1.74 1.016,-2.14c -3.554,-0.404 -7.29,-1.777 -7.29,-7.907c 0,-1.747 0.625,-3.174 1.649,-4.295c -0.166,-0.403 -0.714,-2.03 0.155,-4.234c 0,0 1.344,-0.43 4.401,1.64c 1.276,-0.355 2.645,-0.532 4.005,-0.539c 1.359,0.006 2.729,0.184 4.008,0.539c 3.054,-2.07 4.395,-1.64 4.395,-1.64c 0.871,2.204 0.323,3.831 0.157,4.234c 1.026,1.12 1.647,2.548 1.647,4.295c 0,6.145 -3.743,7.498 -7.306,7.895c 0.574,0.497 1.085,1.47 1.085,2.963c 0,2.141 -0.019,3.864 -0.019,4.391c 0,0.426 0.288,0.925 1.099,0.768c 6.354,-2.118 10.933,-8.113 10.933,-15.18c 0,-8.837 -7.164,-16 -16,-16Z"></path></svg>GitHub</a><a href="./" title="Introducing a&nbsp;library and motivations.">1. Introduction</a><a href="elements" title="Basic concepts of elements modifications and creations." class="current">2. Elements</a></nav><main><h2>Native JavaScript DOM elements creations</h2><p>Let’s go through all patterns we would like to use and what needs to be improved for better experience.</p><h3>Creating element(s) (with custom attributes)</h3><p>You can create a native DOM element by using the <a href="https://developer.mozilla.org/en-US/docs/Web/API/Document/createElement" title="MDN documentation for document.createElement()"><code>document.createElement()</code></a>. It is also possible to provide a&nbsp;some attribute(s) declaratively using <code>Object.assign()</code>. More precisely, this way you can sets some <a href="https://developer.mozilla.org/en-US/docs/Glossary/IDL" title="MDN page about Interface Description Language"><abbr title="Interface Description Language">IDL</abbr></a>.</p><!--<dde:mark type="component" name="example" host="this"/>--><div id="code-zxdx3" class="example"><pre><code class="language-javascript">document.body.append(
+<!DOCTYPE html><html><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1"><link rel="stylesheet" href="elements.css"><meta name="description" content="Basic concepts of elements modifications and creations."><!--<dde:mark type="component" name="metaTwitter" host="this"/>--><meta name="twitter:card" content="summary_large_image"><meta name="twitter:url" content="https://github.com/jaandrle/deka-dom-el"><meta name="twitter:title" content="deka-dom-el"><meta name="twitter:description" content="A low-code library that simplifies the creation of native DOM elements/components using small wrappers and tweaks."><meta name="twitter:creator" content="@jaandrle"><!--<dde:mark type="component" name="metaFacebook" host="this"/>--><meta name="og:url" content="https://github.com/jaandrle/deka-dom-el"><meta name="og:title" content="deka-dom-el"><meta name="og:description" content="A low-code library that simplifies the creation of native DOM elements/components using small wrappers and tweaks."><meta name="og:creator" content="@jaandrle"><title>`deka-dom-el` — Elements</title><script src="https://flems.io/flems.html" type="text/javascript" charset="utf-8"></script></head><body><!--<dde:mark type="component" name="page" host="this"/>--><!--<dde:mark type="component" name="header" host="this"/>--><header><h1>`deka-dom-el` — Elements</h1><p>Basic concepts of elements modifications and creations.</p></header><nav><a href="https://github.com/jaandrle/deka-dom-el"><svg class="icon" viewbox="0 0 32 32"><!--<dde:mark type="component" name="iconGitHub" host="parentElement"/>--><path d="M 16,0.395c -8.836,0 -16,7.163 -16,16c 0,7.069 4.585,13.067 10.942,15.182c 0.8,0.148 1.094,-0.347 1.094,-0.77c 0,-0.381 -0.015,-1.642 -0.022,-2.979c -4.452,0.968 -5.391,-1.888 -5.391,-1.888c -0.728,-1.849 -1.776,-2.341 -1.776,-2.341c -1.452,-0.993 0.11,-0.973 0.11,-0.973c 1.606,0.113 2.452,1.649 2.452,1.649c 1.427,2.446 3.743,1.739 4.656,1.33c 0.143,-1.034 0.558,-1.74 1.016,-2.14c -3.554,-0.404 -7.29,-1.777 -7.29,-7.907c 0,-1.747 0.625,-3.174 1.649,-4.295c -0.166,-0.403 -0.714,-2.03 0.155,-4.234c 0,0 1.344,-0.43 4.401,1.64c 1.276,-0.355 2.645,-0.532 4.005,-0.539c 1.359,0.006 2.729,0.184 4.008,0.539c 3.054,-2.07 4.395,-1.64 4.395,-1.64c 0.871,2.204 0.323,3.831 0.157,4.234c 1.026,1.12 1.647,2.548 1.647,4.295c 0,6.145 -3.743,7.498 -7.306,7.895c 0.574,0.497 1.085,1.47 1.085,2.963c 0,2.141 -0.019,3.864 -0.019,4.391c 0,0.426 0.288,0.925 1.099,0.768c 6.354,-2.118 10.933,-8.113 10.933,-15.18c 0,-8.837 -7.164,-16 -16,-16Z"></path></svg>GitHub</a><a href="./" title="Introducing a&nbsp;library and motivations.">1. Introduction</a><a href="elements" title="Basic concepts of elements modifications and creations." class="current">2. Elements</a></nav><main><h2>Native JavaScript DOM elements creations</h2><p>Let’s go through all patterns we would like to use and what needs to be improved for better experience.</p><h3>Creating element(s) (with custom attributes)</h3><p>You can create a native DOM element by using the <a href="https://developer.mozilla.org/en-US/docs/Web/API/Document/createElement" title="MDN documentation for document.createElement()"><code>document.createElement()</code></a>. It is also possible to provide a&nbsp;some attribute(s) declaratively using <code>Object.assign()</code>. More precisely, this way you can sets some <a href="https://developer.mozilla.org/en-US/docs/Glossary/IDL" title="MDN page about Interface Description Language"><abbr title="Interface Description Language">IDL</abbr></a>.</p><!--<dde:mark type="component" name="example" host="this"/>--><div id="code-m4hdt" class="example"><pre><code class="language-javascript">document.body.append(
 	document.createElement("div")
 );
 console.log(
@@ -12,7 +12,7 @@ document.body.append(
 		{ textContent: "Element’s text content.", style: "color: coral;" }
 	)
 );
-</code></pre></div><script>Flems(document.getElementById("code-zxdx3"), JSON.parse("{\"files\":[{\"name\":\".js\",\"content\":\"document.body.append(\\n\\tdocument.createElement(\\\"div\\\")\\n);\\nconsole.log(\\n\\t\\\"Emty div is generated inside <body>:\\\",\\n\\tdocument.body.innerHTML.includes(\\\"<div></div>\\\")\\n);\\n\\ndocument.body.append(\\n\\tObject.assign(\\n\\t\\tdocument.createElement(\\\"p\\\"),\\n\\t\\t{ textContent: \\\"Element’s text content.\\\", style: \\\"color: coral;\\\" }\\n\\t)\\n);\\n\"}],\"toolbar\":false}"));</script><p>To make this easier, you can use the <code>el</code> function. Internally in basic examples, it is wrapper around <code>assign(document.createElement(…), { … })</code>.</p><!--<dde:mark type="component" name="example" host="this"/>--><div id="code-98ya3" class="example"><pre><code class="language-javascript">import { el, assign } from "https://cdn.jsdelivr.net/gh/jaandrle/deka-dom-el/dist/esm-with-signals.js";
+</code></pre></div><script>Flems(document.getElementById("code-m4hdt"), JSON.parse("{\"files\":[{\"name\":\".js\",\"content\":\"document.body.append(\\n\\tdocument.createElement(\\\"div\\\")\\n);\\nconsole.log(\\n\\t\\\"Emty div is generated inside <body>:\\\",\\n\\tdocument.body.innerHTML.includes(\\\"<div></div>\\\")\\n);\\n\\ndocument.body.append(\\n\\tObject.assign(\\n\\t\\tdocument.createElement(\\\"p\\\"),\\n\\t\\t{ textContent: \\\"Element’s text content.\\\", style: \\\"color: coral;\\\" }\\n\\t)\\n);\\n\"}],\"toolbar\":false}"));</script><p>To make this easier, you can use the <code>el</code> function. Internally in basic examples, it is wrapper around <code>assign(document.createElement(…), { … })</code>.</p><!--<dde:mark type="component" name="example" host="this"/>--><div id="code-5855d" class="example"><pre><code class="language-javascript">import { el, assign } from "https://cdn.jsdelivr.net/gh/jaandrle/deka-dom-el/dist/esm-with-signals.js";
 const color= "lightcoral";
 document.body.append(
 	el("p", { textContent: "Hello (first time)", style: { color } })
@@ -23,7 +23,7 @@ document.body.append(
 		{ textContent: "Hello (second time)", style: { color } }
 	)
 );
-</code></pre></div><script>Flems(document.getElementById("code-98ya3"), JSON.parse("{\"files\":[{\"name\":\".js\",\"content\":\"import { el, assign } from \\\"https://cdn.jsdelivr.net/gh/jaandrle/deka-dom-el/dist/esm-with-signals.js\\\";\\nconst color= \\\"lightcoral\\\";\\ndocument.body.append(\\n\\tel(\\\"p\\\", { textContent: \\\"Hello (first time)\\\", style: { color } })\\n);\\ndocument.body.append(\\n\\tassign(\\n\\t\\tdocument.createElement(\\\"p\\\"),\\n\\t\\t{ textContent: \\\"Hello (second time)\\\", style: { color } }\\n\\t)\\n);\\n\"}],\"toolbar\":false}"));</script><p>The <code>assign</code> function provides improved behaviour of <code>Object.assign()</code>. You can declaratively sets any IDL and attribute of the given element. Function prefers IDL and fallback to the <code>element.setAttribute</code> if there is no writable property in the element prototype.</p><p>You can study all JavaScript elements interfaces to the corresponding HTML elements. All HTML elements inherits from <a href="https://developer.mozilla.org/en-US/docs/Web/API/HTMLElement">HTMLElement</a>. To see all available IDLs for example for paragraphs, see <a href="https://developer.mozilla.org/en-US/docs/Web/API/HTMLParagraphElement">HTMLParagraphElement</a>. Moreover, the <code>assign</code> provides a&nbsp;way to sets declaratively some convenient properties:</p><ul><li>It is possible to sets <code>data-*</code>/<code>aria-*</code> attributes using object notation.</li><li>In opposite, it is also possible to sets <code>data-*</code>/<code>aria-*</code> attribute using camelCase notation.</li><li>You can use string or object as a&nbsp;value for <code>style</code> property.</li><li><code>className</code> (IDL – preffered)/<code>class</code> are ways to add CSS class to the element. You can use string (similarly to <code>class="…"</code> syntax in  HTML) or array of strings. This is handy to concat conditional classes.</li><li>Use <code>classList</code> to toggle specific classes. This will be handy later when the reactivity via signals is beeing introduced.</li><li>The <code>assign</code> also accepts the <code>undefined</code> as a&nbsp;value for any property to remove it from the element declaratively. Also for some IDL the corresponding attribute is removed as it can be confusing. <em>For example, natievly the element’s <code>id</code> is removed by setting the IDL to an empty string.</em></li></ul><p>For processing, the <code>assign</code> internally uses <code>assignAttribute</code> and <code>classListDeclarative</code>.</p><!--<dde:mark type="component" name="example" host="this"/>--><div id="code-bfx2a" class="example"><pre><code class="language-javascript">import { assignAttribute, classListDeclarative } from "https://cdn.jsdelivr.net/gh/jaandrle/deka-dom-el/dist/esm-with-signals.js";
+</code></pre></div><script>Flems(document.getElementById("code-5855d"), JSON.parse("{\"files\":[{\"name\":\".js\",\"content\":\"import { el, assign } from \\\"https://cdn.jsdelivr.net/gh/jaandrle/deka-dom-el/dist/esm-with-signals.js\\\";\\nconst color= \\\"lightcoral\\\";\\ndocument.body.append(\\n\\tel(\\\"p\\\", { textContent: \\\"Hello (first time)\\\", style: { color } })\\n);\\ndocument.body.append(\\n\\tassign(\\n\\t\\tdocument.createElement(\\\"p\\\"),\\n\\t\\t{ textContent: \\\"Hello (second time)\\\", style: { color } }\\n\\t)\\n);\\n\"}],\"toolbar\":false}"));</script><p>The <code>assign</code> function provides improved behaviour of <code>Object.assign()</code>. You can declaratively sets any IDL and attribute of the given element. Function prefers IDL and fallback to the <code>element.setAttribute</code> if there is no writable property in the element prototype.</p><p>You can study all JavaScript elements interfaces to the corresponding HTML elements. All HTML elements inherits from <a href="https://developer.mozilla.org/en-US/docs/Web/API/HTMLElement">HTMLElement</a>. To see all available IDLs for example for paragraphs, see <a href="https://developer.mozilla.org/en-US/docs/Web/API/HTMLParagraphElement">HTMLParagraphElement</a>. Moreover, the <code>assign</code> provides a&nbsp;way to sets declaratively some convenient properties:</p><ul><li>It is possible to sets <code>data-*</code>/<code>aria-*</code> attributes using object notation.</li><li>In opposite, it is also possible to sets <code>data-*</code>/<code>aria-*</code> attribute using camelCase notation.</li><li>You can use string or object as a&nbsp;value for <code>style</code> property.</li><li><code>className</code> (IDL – preffered)/<code>class</code> are ways to add CSS class to the element. You can use string (similarly to <code>class="…"</code> syntax in  HTML) or array of strings. This is handy to concat conditional classes.</li><li>Use <code>classList</code> to toggle specific classes. This will be handy later when the reactivity via signals is beeing introduced.</li><li>The <code>assign</code> also accepts the <code>undefined</code> as a&nbsp;value for any property to remove it from the element declaratively. Also for some IDL the corresponding attribute is removed as it can be confusing. <em>For example, natievly the element’s <code>id</code> is removed by setting the IDL to an empty string.</em></li></ul><p>For processing, the <code>assign</code> internally uses <code>assignAttribute</code> and <code>classListDeclarative</code>.</p><!--<dde:mark type="component" name="example" host="this"/>--><div id="code-5f8sp" class="example"><pre><code class="language-javascript">import { assignAttribute, classListDeclarative } from "https://cdn.jsdelivr.net/gh/jaandrle/deka-dom-el/dist/esm-with-signals.js";
 const paragraph= document.createElement("p");
 
 assignAttribute(paragraph, "textContent", "Hello, world!");
@@ -48,7 +48,7 @@ console.log(paragraph.outerHTML);
 document.body.append(
 	paragraph
 );
-</code></pre></div><script>Flems(document.getElementById("code-bfx2a"), JSON.parse("{\"files\":[{\"name\":\".js\",\"content\":\"import { assignAttribute, classListDeclarative } from \\\"https://cdn.jsdelivr.net/gh/jaandrle/deka-dom-el/dist/esm-with-signals.js\\\";\\nconst paragraph= document.createElement(\\\"p\\\");\\n\\nassignAttribute(paragraph, \\\"textContent\\\", \\\"Hello, world!\\\");\\nassignAttribute(paragraph, \\\"style\\\", { color: \\\"navy\\\" });\\n\\nassignAttribute(paragraph, \\\"dataTest1\\\", \\\"v1\\\");\\nassignAttribute(paragraph, \\\"dataset\\\", { test2: \\\"v2\\\" });\\n\\nassignAttribute(paragraph, \\\"ariaLabel\\\", \\\"v1\\\");\\nassignAttribute(paragraph, \\\"ariaset\\\", { role: \\\"none\\\" });\\n\\n\\nclassListDeclarative(paragraph, {\\n\\tclassAdd: true,\\n\\tclassRemove: false,\\n\\tclassAdd1: 1,\\n\\tclassRemove1: 0,\\n\\tclassToggle: -1\\n});\\n\\nconsole.log(paragraph.outerHTML);\\ndocument.body.append(\\n\\tparagraph\\n);\\n\"}],\"toolbar\":false}"));</script><h3>Native JavaScript templating</h3><p>By default, the native JS has no good way to define HTML template using DOM API:</p><!--<dde:mark type="component" name="example" host="this"/>--><div id="code-0enam" class="example"><pre><code class="language-javascript">document.body.append(
+</code></pre></div><script>Flems(document.getElementById("code-5f8sp"), JSON.parse("{\"files\":[{\"name\":\".js\",\"content\":\"import { assignAttribute, classListDeclarative } from \\\"https://cdn.jsdelivr.net/gh/jaandrle/deka-dom-el/dist/esm-with-signals.js\\\";\\nconst paragraph= document.createElement(\\\"p\\\");\\n\\nassignAttribute(paragraph, \\\"textContent\\\", \\\"Hello, world!\\\");\\nassignAttribute(paragraph, \\\"style\\\", { color: \\\"navy\\\" });\\n\\nassignAttribute(paragraph, \\\"dataTest1\\\", \\\"v1\\\");\\nassignAttribute(paragraph, \\\"dataset\\\", { test2: \\\"v2\\\" });\\n\\nassignAttribute(paragraph, \\\"ariaLabel\\\", \\\"v1\\\");\\nassignAttribute(paragraph, \\\"ariaset\\\", { role: \\\"none\\\" });\\n\\n\\nclassListDeclarative(paragraph, {\\n\\tclassAdd: true,\\n\\tclassRemove: false,\\n\\tclassAdd1: 1,\\n\\tclassRemove1: 0,\\n\\tclassToggle: -1\\n});\\n\\nconsole.log(paragraph.outerHTML);\\ndocument.body.append(\\n\\tparagraph\\n);\\n\"}],\"toolbar\":false}"));</script><h3>Native JavaScript templating</h3><p>By default, the native JS has no good way to define HTML template using DOM API:</p><!--<dde:mark type="component" name="example" host="this"/>--><div id="code-48dwd" class="example"><pre><code class="language-javascript">document.body.append(
 	document.createElement("div"),
 	document.createElement("span"),
 	document.createElement("main")
@@ -59,7 +59,7 @@ const template= document.createElement("main").append(
 	document.createElement("span"),
 );
 console.log(typeof template==="undefined");
-</code></pre></div><script>Flems(document.getElementById("code-0enam"), JSON.parse("{\"files\":[{\"name\":\".js\",\"content\":\"document.body.append(\\n\\tdocument.createElement(\\\"div\\\"),\\n\\tdocument.createElement(\\\"span\\\"),\\n\\tdocument.createElement(\\\"main\\\")\\n);\\nconsole.log(document.body.innerHTML.includes(\\\"<div></div><span></span><main></main>\\\"));\\nconst template= document.createElement(\\\"main\\\").append(\\n\\tdocument.createElement(\\\"div\\\"),\\n\\tdocument.createElement(\\\"span\\\"),\\n);\\nconsole.log(typeof template===\\\"undefined\\\");\\n\"}],\"toolbar\":false}"));</script><p>This library therefore overwrites the <code>append</code> method of created elements to always return parent element.</p><!--<dde:mark type="component" name="example" host="this"/>--><div id="code-dvz29" class="example"><pre><code class="language-javascript">import { el } from "https://cdn.jsdelivr.net/gh/jaandrle/deka-dom-el/dist/esm-with-signals.js";
+</code></pre></div><script>Flems(document.getElementById("code-48dwd"), JSON.parse("{\"files\":[{\"name\":\".js\",\"content\":\"document.body.append(\\n\\tdocument.createElement(\\\"div\\\"),\\n\\tdocument.createElement(\\\"span\\\"),\\n\\tdocument.createElement(\\\"main\\\")\\n);\\nconsole.log(document.body.innerHTML.includes(\\\"<div></div><span></span><main></main>\\\"));\\nconst template= document.createElement(\\\"main\\\").append(\\n\\tdocument.createElement(\\\"div\\\"),\\n\\tdocument.createElement(\\\"span\\\"),\\n);\\nconsole.log(typeof template===\\\"undefined\\\");\\n\"}],\"toolbar\":false}"));</script><p>This library therefore overwrites the <code>append</code> method of created elements to always return parent element.</p><!--<dde:mark type="component" name="example" host="this"/>--><div id="code-k8b3j" class="example"><pre><code class="language-javascript">import { el } from "https://cdn.jsdelivr.net/gh/jaandrle/deka-dom-el/dist/esm-with-signals.js";
 document.head.append(
 	el("style").append(
 		"tr, td{ border: 1px solid red; padding: 1em; }",
@@ -83,7 +83,7 @@ document.body.append(
 		)
 	)
 );
-</code></pre></div><script>Flems(document.getElementById("code-dvz29"), JSON.parse("{\"files\":[{\"name\":\".js\",\"content\":\"import { el } from \\\"https://cdn.jsdelivr.net/gh/jaandrle/deka-dom-el/dist/esm-with-signals.js\\\";\\ndocument.head.append(\\n\\tel(\\\"style\\\").append(\\n\\t\\t\\\"tr, td{ border: 1px solid red; padding: 1em; }\\\",\\n\\t\\t\\\"table{ border-collapse: collapse; }\\\"\\n\\t)\\n);\\ndocument.body.append(\\n\\tel(\\\"p\\\", \\\"Example of a complex template. Using for example nesting lists:\\\"),\\n\\tel(\\\"ul\\\").append(\\n\\t\\tel(\\\"li\\\", \\\"List item 1\\\"),\\n\\t\\tel(\\\"li\\\").append(\\n\\t\\t\\tel(\\\"ul\\\").append(\\n\\t\\t\\t\\tel(\\\"li\\\", \\\"Nested list item 1\\\"),\\n\\t\\t\\t)\\n\\t\\t)\\n\\t),\\n\\tel(\\\"table\\\").append(\\n\\t\\tel(\\\"tr\\\").append(\\n\\t\\t\\tel(\\\"td\\\", \\\"Row 1 – Col 1\\\"),\\n\\t\\t\\tel(\\\"td\\\", \\\"Row 1 – Col 2\\\")\\n\\t\\t)\\n\\t)\\n);\\n\"}],\"toolbar\":false}"));</script><h2>Creating advanced (reactive) templates and components</h2><h3>Basic components</h3><p>You can use functions for encapsulation (repeating) logic. The <code>el</code> accepts function as first argument. In that case, the function should return dom elements and the second argument for <code>el</code> is argument for given element.</p><!--<dde:mark type="component" name="example" host="this"/>--><div id="code-4r8hj" class="example"><pre><code class="language-javascript">import { el } from "https://cdn.jsdelivr.net/gh/jaandrle/deka-dom-el/dist/esm-with-signals.js";
+</code></pre></div><script>Flems(document.getElementById("code-k8b3j"), JSON.parse("{\"files\":[{\"name\":\".js\",\"content\":\"import { el } from \\\"https://cdn.jsdelivr.net/gh/jaandrle/deka-dom-el/dist/esm-with-signals.js\\\";\\ndocument.head.append(\\n\\tel(\\\"style\\\").append(\\n\\t\\t\\\"tr, td{ border: 1px solid red; padding: 1em; }\\\",\\n\\t\\t\\\"table{ border-collapse: collapse; }\\\"\\n\\t)\\n);\\ndocument.body.append(\\n\\tel(\\\"p\\\", \\\"Example of a complex template. Using for example nesting lists:\\\"),\\n\\tel(\\\"ul\\\").append(\\n\\t\\tel(\\\"li\\\", \\\"List item 1\\\"),\\n\\t\\tel(\\\"li\\\").append(\\n\\t\\t\\tel(\\\"ul\\\").append(\\n\\t\\t\\t\\tel(\\\"li\\\", \\\"Nested list item 1\\\"),\\n\\t\\t\\t)\\n\\t\\t)\\n\\t),\\n\\tel(\\\"table\\\").append(\\n\\t\\tel(\\\"tr\\\").append(\\n\\t\\t\\tel(\\\"td\\\", \\\"Row 1 – Col 1\\\"),\\n\\t\\t\\tel(\\\"td\\\", \\\"Row 1 – Col 2\\\")\\n\\t\\t)\\n\\t)\\n);\\n\"}],\"toolbar\":false}"));</script><h2>Creating advanced (reactive) templates and components</h2><h3>Basic components</h3><p>You can use functions for encapsulation (repeating) logic. The <code>el</code> accepts function as first argument. In that case, the function should return dom elements and the second argument for <code>el</code> is argument for given element.</p><!--<dde:mark type="component" name="example" host="this"/>--><div id="code-4qwvd" class="example"><pre><code class="language-javascript">import { el } from "https://cdn.jsdelivr.net/gh/jaandrle/deka-dom-el/dist/esm-with-signals.js";
 document.head.append(
 	el("style").append(
 		".class1{ font-weight: bold; }",
@@ -100,4 +100,4 @@ function component({ className, textContent }){
 		el("p", textContent)
 	);
 }
-</code></pre></div><script>Flems(document.getElementById("code-4r8hj"), JSON.parse("{\"files\":[{\"name\":\".js\",\"content\":\"import { el } from \\\"https://cdn.jsdelivr.net/gh/jaandrle/deka-dom-el/dist/esm-with-signals.js\\\";\\ndocument.head.append(\\n\\tel(\\\"style\\\").append(\\n\\t\\t\\\".class1{ font-weight: bold; }\\\",\\n\\t\\t\\\".class2{ color: purple; }\\\"\\n\\t)\\n);\\ndocument.body.append(\\n\\tel(component, { className: \\\"class2\\\", textContent: \\\"Hello World!\\\" }),\\n\\tcomponent({ className: \\\"class2\\\", textContent: \\\"Hello World!\\\" })\\n);\\n\\nfunction component({ className, textContent }){\\n\\treturn el(\\\"div\\\", { className: [ \\\"class1\\\", className ] }).append(\\n\\t\\tel(\\\"p\\\", textContent)\\n\\t);\\n}\\n\"}],\"toolbar\":false}"));</script><p>It is nice to use similar naming convention as native DOM API.</p></main></body></html>
\ No newline at end of file
+</code></pre></div><script>Flems(document.getElementById("code-4qwvd"), JSON.parse("{\"files\":[{\"name\":\".js\",\"content\":\"import { el } from \\\"https://cdn.jsdelivr.net/gh/jaandrle/deka-dom-el/dist/esm-with-signals.js\\\";\\ndocument.head.append(\\n\\tel(\\\"style\\\").append(\\n\\t\\t\\\".class1{ font-weight: bold; }\\\",\\n\\t\\t\\\".class2{ color: purple; }\\\"\\n\\t)\\n);\\ndocument.body.append(\\n\\tel(component, { className: \\\"class2\\\", textContent: \\\"Hello World!\\\" }),\\n\\tcomponent({ className: \\\"class2\\\", textContent: \\\"Hello World!\\\" })\\n);\\n\\nfunction component({ className, textContent }){\\n\\treturn el(\\\"div\\\", { className: [ \\\"class1\\\", className ] }).append(\\n\\t\\tel(\\\"p\\\", textContent)\\n\\t);\\n}\\n\"}],\"toolbar\":false}"));</script><p>It is nice to use similar naming convention as native DOM API.</p></main></body></html>
\ No newline at end of file
diff --git a/docs/index.html b/docs/index.html
index aa1353d..a6b813e 100644
--- a/docs/index.html
+++ b/docs/index.html
@@ -1,4 +1,4 @@
-<!DOCTYPE html><html><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1"><link rel="stylesheet" href="index.css"><meta name="description" content="Introducing a&nbsp;library and motivations."><!--<dde:mark type="component" name="metaTwitter" host="this"/>--><meta name="twitter:card" content="summary_large_image"><meta name="twitter:url" content="https://github.com/jaandrle/deka-dom-el"><meta name="twitter:title" content="deka-dom-el"><meta name="twitter:description" content="A low-code library that simplifies the creation of native DOM elements/components using small wrappers and tweaks."><meta name="twitter:creator" content="@jaandrle"><!--<dde:mark type="component" name="metaFacebook" host="this"/>--><meta name="og:url" content="https://github.com/jaandrle/deka-dom-el"><meta name="og:title" content="deka-dom-el"><meta name="og:description" content="A low-code library that simplifies the creation of native DOM elements/components using small wrappers and tweaks."><meta name="og:creator" content="@jaandrle"><title>`deka-dom-el` — Introduction</title><script src="https://flems.io/flems.html" type="text/javascript" charset="utf-8"></script></head><body><!--<dde:mark type="component" name="page" host="this"/>--><!--<dde:mark type="component" name="header" host="this"/>--><header><h1>`deka-dom-el` — Introduction</h1><p>Introducing a&nbsp;library and motivations.</p></header><nav><a href="https://github.com/jaandrle/deka-dom-el"><svg class="icon" viewbox="0 0 32 32"><!--<dde:mark type="component" name="iconGitHub" host="parentElement"/>--><path d="M 16,0.395c -8.836,0 -16,7.163 -16,16c 0,7.069 4.585,13.067 10.942,15.182c 0.8,0.148 1.094,-0.347 1.094,-0.77c 0,-0.381 -0.015,-1.642 -0.022,-2.979c -4.452,0.968 -5.391,-1.888 -5.391,-1.888c -0.728,-1.849 -1.776,-2.341 -1.776,-2.341c -1.452,-0.993 0.11,-0.973 0.11,-0.973c 1.606,0.113 2.452,1.649 2.452,1.649c 1.427,2.446 3.743,1.739 4.656,1.33c 0.143,-1.034 0.558,-1.74 1.016,-2.14c -3.554,-0.404 -7.29,-1.777 -7.29,-7.907c 0,-1.747 0.625,-3.174 1.649,-4.295c -0.166,-0.403 -0.714,-2.03 0.155,-4.234c 0,0 1.344,-0.43 4.401,1.64c 1.276,-0.355 2.645,-0.532 4.005,-0.539c 1.359,0.006 2.729,0.184 4.008,0.539c 3.054,-2.07 4.395,-1.64 4.395,-1.64c 0.871,2.204 0.323,3.831 0.157,4.234c 1.026,1.12 1.647,2.548 1.647,4.295c 0,6.145 -3.743,7.498 -7.306,7.895c 0.574,0.497 1.085,1.47 1.085,2.963c 0,2.141 -0.019,3.864 -0.019,4.391c 0,0.426 0.288,0.925 1.099,0.768c 6.354,-2.118 10.933,-8.113 10.933,-15.18c 0,-8.837 -7.164,-16 -16,-16Z"></path></svg>GitHub</a><a href="./" title="Introducing a&nbsp;library and motivations." class="current">1. Introduction</a><a href="elements" title="Basic concepts of elements modifications and creations.">2. Elements</a></nav><main><p>The library tries to provide pure JavaScript tool(s) to create reactive interfaces. </p><!--<dde:mark type="component" name="example" host="this"/>--><div id="code-pzi4k" class="example"><pre><code class="language-javascript">import { el, S } from "https://cdn.jsdelivr.net/gh/jaandrle/deka-dom-el/dist/esm-with-signals.js";
+<!DOCTYPE html><html><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1"><link rel="stylesheet" href="index.css"><meta name="description" content="Introducing a&nbsp;library and motivations."><!--<dde:mark type="component" name="metaTwitter" host="this"/>--><meta name="twitter:card" content="summary_large_image"><meta name="twitter:url" content="https://github.com/jaandrle/deka-dom-el"><meta name="twitter:title" content="deka-dom-el"><meta name="twitter:description" content="A low-code library that simplifies the creation of native DOM elements/components using small wrappers and tweaks."><meta name="twitter:creator" content="@jaandrle"><!--<dde:mark type="component" name="metaFacebook" host="this"/>--><meta name="og:url" content="https://github.com/jaandrle/deka-dom-el"><meta name="og:title" content="deka-dom-el"><meta name="og:description" content="A low-code library that simplifies the creation of native DOM elements/components using small wrappers and tweaks."><meta name="og:creator" content="@jaandrle"><title>`deka-dom-el` — Introduction</title><script src="https://flems.io/flems.html" type="text/javascript" charset="utf-8"></script></head><body><!--<dde:mark type="component" name="page" host="this"/>--><!--<dde:mark type="component" name="header" host="this"/>--><header><h1>`deka-dom-el` — Introduction</h1><p>Introducing a&nbsp;library and motivations.</p></header><nav><a href="https://github.com/jaandrle/deka-dom-el"><svg class="icon" viewbox="0 0 32 32"><!--<dde:mark type="component" name="iconGitHub" host="parentElement"/>--><path d="M 16,0.395c -8.836,0 -16,7.163 -16,16c 0,7.069 4.585,13.067 10.942,15.182c 0.8,0.148 1.094,-0.347 1.094,-0.77c 0,-0.381 -0.015,-1.642 -0.022,-2.979c -4.452,0.968 -5.391,-1.888 -5.391,-1.888c -0.728,-1.849 -1.776,-2.341 -1.776,-2.341c -1.452,-0.993 0.11,-0.973 0.11,-0.973c 1.606,0.113 2.452,1.649 2.452,1.649c 1.427,2.446 3.743,1.739 4.656,1.33c 0.143,-1.034 0.558,-1.74 1.016,-2.14c -3.554,-0.404 -7.29,-1.777 -7.29,-7.907c 0,-1.747 0.625,-3.174 1.649,-4.295c -0.166,-0.403 -0.714,-2.03 0.155,-4.234c 0,0 1.344,-0.43 4.401,1.64c 1.276,-0.355 2.645,-0.532 4.005,-0.539c 1.359,0.006 2.729,0.184 4.008,0.539c 3.054,-2.07 4.395,-1.64 4.395,-1.64c 0.871,2.204 0.323,3.831 0.157,4.234c 1.026,1.12 1.647,2.548 1.647,4.295c 0,6.145 -3.743,7.498 -7.306,7.895c 0.574,0.497 1.085,1.47 1.085,2.963c 0,2.141 -0.019,3.864 -0.019,4.391c 0,0.426 0.288,0.925 1.099,0.768c 6.354,-2.118 10.933,-8.113 10.933,-15.18c 0,-8.837 -7.164,-16 -16,-16Z"></path></svg>GitHub</a><a href="./" title="Introducing a&nbsp;library and motivations." class="current">1. Introduction</a><a href="elements" title="Basic concepts of elements modifications and creations.">2. Elements</a></nav><main><p>The library tries to provide pure JavaScript tool(s) to create reactive interfaces. </p><!--<dde:mark type="component" name="example" host="this"/>--><div id="code-duj4w" class="example"><pre><code class="language-javascript">import { el, S } from "https://cdn.jsdelivr.net/gh/jaandrle/deka-dom-el/dist/esm-with-signals.js";
 const clicks= S(0);
 document.body.append(
 	el().append(
@@ -12,4 +12,4 @@ document.body.append(
 		})
 	)
 );
-</code></pre></div><script>Flems(document.getElementById("code-pzi4k"), JSON.parse("{\"files\":[{\"name\":\".js\",\"content\":\"import { el, S } from \\\"https://cdn.jsdelivr.net/gh/jaandrle/deka-dom-el/dist/esm-with-signals.js\\\";\\nconst clicks= S(0);\\ndocument.body.append(\\n\\tel().append(\\n\\t\\tel(\\\"p\\\", S(()=>\\n\\t\\t\\t\\\"Hello World \\\"+\\\"🎉\\\".repeat(clicks())\\n\\t\\t)),\\n\\t\\tel(\\\"button\\\", {\\n\\t\\t\\ttype: \\\"button\\\",\\n\\t\\t\\tonclick: ()=> clicks(clicks()+1),\\n\\t\\t\\ttextContent: \\\"Fire\\\"\\n\\t\\t})\\n\\t)\\n);\\n\"}],\"toolbar\":false}"));</script></main></body></html>
\ No newline at end of file
+</code></pre></div><script>Flems(document.getElementById("code-duj4w"), JSON.parse("{\"files\":[{\"name\":\".js\",\"content\":\"import { el, S } from \\\"https://cdn.jsdelivr.net/gh/jaandrle/deka-dom-el/dist/esm-with-signals.js\\\";\\nconst clicks= S(0);\\ndocument.body.append(\\n\\tel().append(\\n\\t\\tel(\\\"p\\\", S(()=>\\n\\t\\t\\t\\\"Hello World \\\"+\\\"🎉\\\".repeat(clicks())\\n\\t\\t)),\\n\\t\\tel(\\\"button\\\", {\\n\\t\\t\\ttype: \\\"button\\\",\\n\\t\\t\\tonclick: ()=> clicks(clicks()+1),\\n\\t\\t\\ttextContent: \\\"Fire\\\"\\n\\t\\t})\\n\\t)\\n);\\n\"}],\"toolbar\":false}"));</script></main></body></html>
\ No newline at end of file
diff --git a/docs_src/types.d.ts b/docs_src/types.d.ts
index 13168fb..2d831f0 100644
--- a/docs_src/types.d.ts
+++ b/docs_src/types.d.ts
@@ -19,3 +19,9 @@ export type PageAttrs= {
 	registerClientFile: registerClientFile
 }
 
+import type { CustomHTMLTestElement } from "../examples/components/webComponent.js";
+declare global{
+	interface ddePublicElementTagNameMap{
+		["custom-test"]: CustomHTMLTestElement;
+	}
+}
diff --git a/examples/components/webComponent.js b/examples/components/webComponent.js
index 5232a3d..d845970 100644
--- a/examples/components/webComponent.js
+++ b/examples/components/webComponent.js
@@ -1,11 +1,17 @@
-import { el, scope } from "../../index.js";
+import { el, on, scope } from "../../index.js";
 import { S } from "../../signals.js";
 const { hasOwnProperty }= Object.prototype;
 
+/**
+ * @typedef CustomHTMLTestElementInterface
+ * @type {object}
+ * @property {string} name
+ * */
 /**
  * Compatible with `npx-wca test/components/webComponent.js`
  * */
 export class CustomHTMLTestElement extends HTMLElement{
+	static tagName= "custom-test";
 	static get observedAttributes(){
 		return [ "name", "pre-name" ];
 	}
@@ -28,16 +34,18 @@ export class CustomHTMLTestElement extends HTMLElement{
 			el("#text", { textContent: name }),
 			el("#text", { textContent: test }),
 			el("#text", { textContent: preName }),
+			el("button", { type: "button", textContent: "pre-name", onclick: ()=> preName("Ahoj") })
 		);
 	}
+	
+	get name(){ return this.getAttribute("name"); }
+	set name(value){ this.setAttribute("name", value); }
+	get preName(){ return this.getAttribute("pre-name"); }
+	set preName(value){ this.setAttribute("pre-name", value); }
 }
 // https://gist.github.com/WebReflection/ec9f6687842aa385477c4afca625bbf4
-customElementsAssign(
-	CustomHTMLTestElement,
-	reflectObservedAttributes,
-	lifecycleToEvents,
-);
-customElements.define("custom-test", CustomHTMLTestElement);
+lifecycleToEvents(CustomHTMLTestElement)
+customElements.define(CustomHTMLTestElement.tagName, CustomHTMLTestElement);
 
 function customElementRender(_this, render){
 	scope.push({ scope: _this, host: (...a)=> a.length ? a[0](_this) : _this });
@@ -45,21 +53,6 @@ function customElementRender(_this, render){
 	scope.pop();
 	return out;
 }
-/** @returns {HTMLElement} */
-function customElementsAssign(class_base, ...automatize){
-	automatize.forEach(a=> a(class_base));
-}
-function reflectObservedAttributes(c){
-	for(const name of c.observedAttributes){
-		const name_camel= name.replace(/([a-z])-([a-z])/g, (_, l, r)=> l+r.toUpperCase());
-		if(hasOwnProperty.call(c.prototype, name_camel))
-			continue;
-		Reflect.defineProperty(c.prototype, name_camel, {
-			get(){ return this.getAttribute(name); },
-			set(value){ this.setAttribute(name, value); }
-		});
-	}
-}
 function lifecycleToEvents(class_declaration){
 	for (const name of [ "connected", "disconnected" ])
 		wrapMethod(class_declaration.prototype, name+"Callback", function(target, thisArg, detail){
diff --git a/examples/index.js b/examples/index.js
index 4bfe947..5ba917c 100644
--- a/examples/index.js
+++ b/examples/index.js
@@ -8,5 +8,5 @@ document.body.append(
 	el("h1", "Experiments:"),
 	el(fullNameComponent),
 	el(todosComponent),
-	el(customElements.getName(CustomHTMLTestElement), { name: "attr" })
+	el(CustomHTMLTestElement.tagName, { name: "attr" })
 );
diff --git a/index.d.ts b/index.d.ts
index c53d3dc..2e5e334 100644
--- a/index.d.ts
+++ b/index.d.ts
@@ -1,9 +1,14 @@
 type CustomElementTagNameMap= { '#text': Text, '#comment': Comment }
+declare global {
+	interface ddePublicElementTagNameMap{
+	}
+}
 type SupportedElement=
 	  HTMLElementTagNameMap[keyof HTMLElementTagNameMap]
 	| SVGElementTagNameMap[keyof SVGElementTagNameMap]
 	| MathMLElementTagNameMap[keyof MathMLElementTagNameMap]
-	| CustomElementTagNameMap[keyof CustomElementTagNameMap];
+	| CustomElementTagNameMap[keyof CustomElementTagNameMap]
+	| ddePublicElementTagNameMap[keyof ddePublicElementTagNameMap];
 declare global {
 	type ddeComponentAttributes= Record<any, any> | undefined | string;
 	type ddeElementModifier<El extends SupportedElement | DocumentFragment>= (element: El)=> El;
@@ -37,7 +42,7 @@ type AttrsModified= {
 type ElementAttributes<T extends SupportedElement>= Omit<T,keyof AttrsModified> & AttrsModified;
 export function assign<El extends SupportedElement>(element: El, ...attrs_array: Partial<ElementAttributes<El>>[]): El
 
-type ExtendedHTMLElementTagNameMap= HTMLElementTagNameMap & CustomElementTagNameMap
+type ExtendedHTMLElementTagNameMap= HTMLElementTagNameMap & CustomElementTagNameMap & ddePublicElementTagNameMap
 export function el<TAG extends keyof ExtendedHTMLElementTagNameMap>(
 	tag_name: TAG,
 	attrs?: string | Partial<ElementAttributes<ExtendedHTMLElementTagNameMap[TAG]>>,
@@ -86,6 +91,7 @@ export function elNS(
 export function dispatchEvent(element: SupportedElement, name: keyof DocumentEventMap): void;
 export function dispatchEvent(element: SupportedElement, name: string, data: any): void;
 interface On{
+	/** Listens to the DOM event. See {@link Document.addEventListener} */
 	<
 		EE extends ddeElementModifier<SupportedElement>,
 		El extends ( EE extends ddeElementModifier<infer El> ? El : never ),
@@ -94,6 +100,7 @@ interface On{
 			listener: (this: El, ev: DocumentEventMap[Event]) => any,
 			options?: AddEventListenerOptions
 		) : EE;
+	/** Listens to the element is connected to the live DOM. In case of custom elements uses [`connectedCallback`](https://developer.mozilla.org/en-US/docs/Web/API/Web_components/Using_custom_elements#custom_element_lifecycle_callbacks), or {@link MutationObserver} else where */
 	connected<
 		EE extends ddeElementModifier<SupportedElement>,
 		El extends ( EE extends ddeElementModifier<infer El> ? El : never )
@@ -101,6 +108,7 @@ interface On{
 			listener: (el: El) => any,
 			options?: AddEventListenerOptions
 		) : EE;
+	/** Listens to the element is disconnected from the live DOM. In case of custom elements uses [`disconnectedCallback`](https://developer.mozilla.org/en-US/docs/Web/API/Web_components/Using_custom_elements#custom_element_lifecycle_callbacks), or {@link MutationObserver} else where */
 	disconnected<
 		EE extends ddeElementModifier<SupportedElement>,
 		El extends ( EE extends ddeElementModifier<infer El> ? El : never )
@@ -108,11 +116,37 @@ interface On{
 			listener: (el: El) => any,
 			options?: AddEventListenerOptions
 		) : EE;
+	/** Listens to the element attribute changes. In case of custom elements uses [`attributeChangedCallback`](https://developer.mozilla.org/en-US/docs/Web/API/Web_components/Using_custom_elements#custom_element_lifecycle_callbacks), or {@link MutationObserver} else where */
+	attributeChanged<
+		EE extends ddeElementModifier<SupportedElement>,
+		El extends ( EE extends ddeElementModifier<infer El> ? El : never )
+		>(
+			listener: (el: El) => any,
+			options?: AddEventListenerOptions
+		) : EE;
 }
 export const on: On;
 
+type Scope= { scope: Node | Function | Object, host: ddeElementModifier<any>, prevent: boolean }
+/** Current scope created last time the `el(Function)` was invoke. (Or {@link scope.push}) */
 export const scope: {
+	current: Scope,
+	/** Stops all automatizations. E. g. signals used as attributes in current scope
+	 * registers removing these listeners (and clean signal if no other listeners are detected)
+	 * on `disconnected` event. */
+	preventDefault<T extends boolean>(prevent: T): T,
+	/**
+	 * This represents reference to the current host element — `scope.host()`.
+	 * It can be also used to register Modifier (function to be called when component is initized)
+	 * — `scope.host(on.connected(console.log))`.
+	 * */
 	host: ddeElementModifier<any>,
+	
+	state: Scope[],
+	/** Adds new child scope. All attributes are inherited by default. */
+	push(scope: Partial<Scope>): ReturnType<Array<Scope>["push"]>
+	/** Removes last/current child scope. */
+	pop(): ReturnType<Array<Scope>["pop"]>
 };
 
 /*
diff --git a/signals.d.ts b/signals.d.ts
index 27ca041..4d99776 100644
--- a/signals.d.ts
+++ b/signals.d.ts
@@ -30,6 +30,10 @@ interface S {
 	 *		by `S.clear`.
 	 * */
 	<V, A extends Actions<V>>(value: V, actions?: A): Signal<V, A>;
+	/**
+	 * Computations signal. This creates a signal which is computed from other signals.
+	 * */
+	<V>(computation: ()=> V): Signal<V, {}>
 	action<S extends Signal<any, Actions<any>>, A extends (S extends Signal<any, infer A> ? A : never), N extends keyof A>(
 		signal: S,
 		name: N,
@@ -41,7 +45,17 @@ interface S {
 		signal: SymbolSignal;
 		onclear: SymbolOnclear;
 	}
-	el<S extends any, T extends HTMLElement>(signal: Signal<S, any>, el: (v: S)=> T): T;
+	/**
+	 * Reactive element, which is rendered based on the given signal.
+	 * ```js
+	 * S.el(signal, value=> value ? el("b", "True") : el("i", "False"));
+	 * S.el(listS, list=> list.map(li=> el("li", li)));
+	 * ```
+	 * */
+	el<S extends any>(signal: Signal<S, any>, el: (v: S)=> Element | Element[]): DocumentFragment;
+
+	/** Mirrors element attributes for current host (both way).  */
+	attribute<T>(name: string, initial?: T): Signal<T, {}>
 }
 export const S: S;
 declare global {
diff --git a/src/signals-lib.js b/src/signals-lib.js
index 8598c71..920a627 100644
--- a/src/signals-lib.js
+++ b/src/signals-lib.js
@@ -67,7 +67,9 @@ import { scope } from "./dom.js";
 const key_attributes= "__dde_attributes";
 S.attribute= function(name, initial= undefined){
 	const out= S(initial);
+	let host;
 	scope.host(element=> {
+		host= element;
 		if(element instanceof HTMLElement){
 			if(element.hasAttribute(name)) out(element.getAttribute(name));
 		} else {
@@ -83,16 +85,26 @@ S.attribute= function(name, initial= undefined){
 			 * Investigate `__dde_attributes` key of the element.*/
 			const [ name, value ]= detail;
 			const curr= element[key_attributes][name];
-			if(curr) curr(value);
+			if(curr) return curr(value);
 		})(element);
 		on.disconnected(function(){
 			/*! This removes all signals mapped to attributes (`S.attribute`).
 			 * Investigate `__dde_attributes` key of the element.*/
 			S.clear(...Object.values(element[key_attributes]));
+			host= null;
 		})(element);
 		return element;
 	});
-	return out;
+	return new Proxy(out, {
+		apply(target, _, args){
+			if(!args.length) return target();
+			if(!host) return;
+			const value= args[0];
+			if(host instanceof HTMLElement)
+				return host.setAttribute(name, value);
+			return host.setAttributeNS(null, name, value);
+		}
+	});
 };
 S.clear= function(...signals){
 	for(const signal of signals){