diff --git a/dist/dde-with-observables.js b/dist/dde-with-observables.js
index 6720c35..cc578f9 100644
--- a/dist/dde-with-observables.js
+++ b/dist/dde-with-observables.js
@@ -1,31 +1,31 @@
 //deka-dom-el library is available via global namespace `dde`
 (()=> {
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-customElementRender: Mt,
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-dispatchEvent: Ut,
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-elementAttribute: dt,
-empty: Nt,
-isObservable: W,
-lifecycleToEvents: Wt,
-observable: m,
-observedAttributes: bt,
-on: x,
-registerReactivity: F,
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\ No newline at end of file
diff --git a/dist/dde.js b/dist/dde.js
index 4005c82..cea6ee4 100644
--- a/dist/dde.js
+++ b/dist/dde.js
@@ -1,25 +1,25 @@
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m=t.get(b);m.length_c&&(b.dispatchEvent(new Event("dde:connected")),m.connected=new WeakSet,m.length_c=0,m.length_d||t.delete(b),f=!0)}return f}function l(s,u){let f=!1;for(let b of s)u&&p(b).then(l),!(!t.has(b)||!t.get(b).length_d)&&((queueMicrotask||setTimeout)(C(b)),f=!0);return f}function C(s){return()=>{s.isConnected||(s.dispatchEvent(new Event("dde:disconnected")),t.delete(s))}}}
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-createElementNS: ut,
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-empty: ft,
-lifecycleToEvents: bt,
-observedAttributes: X,
-on: w,
-registerReactivity: H,
-scope: v,
-simulateSlots: it
+var A={isObservable(t){return!1},processReactiveAttribute(t,e,n,r){return n}};function z(t,e=!0){return e?Object.assign(A,t):(Object.setPrototypeOf(t,A),t)}function _(t){return A.isPrototypeOf(t)&&t!==A?t:A}function E(t){return typeof t>"u"}function O(t,e){if(!t||!(t instanceof AbortSignal))return!0;if(!t.aborted)return t.addEventListener("abort",e),function(){t.removeEventListener("abort",e)}}function k(t,e){let{observedAttributes:n=[]}=t.constructor;return n.reduce(function(r,o){return Reflect.set(r,B(o),e(t,o)),r},{})}function B(t){return t.replace(/-./g,e=>e[1].toUpperCase())}var a={setDeleteAttr:I,ssr:"",D:globalThis.document,F:globalThis.DocumentFragment,H:globalThis.HTMLElement,S:globalThis.SVGElement,M:globalThis.MutationObserver};function I(t,e,n){if(Reflect.set(t,e,n),!!E(n)){if(Reflect.deleteProperty(t,e),t instanceof a.H&&t.getAttribute(e)==="undefined")return t.removeAttribute(e);if(Reflect.get(t,e)==="undefined")return Reflect.set(t,e,"")}}var 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r(e,n,"http://www.w3.org/1999/xlink");case"textContent":return j(t,e,n);case"style":if(typeof n!="object")break;case"dataset":return N(o,n,q.bind(null,t[e]));case"ariaset":return N(o,n,(d,h)=>r("aria-"+d,h));case"classList":return V.call(c,t,n)}return K(t,e)?j(t,e,n):r(e,n)}function $(t,e){if(L.has(t))return L.get(t);let r=(t instanceof a.S?X:Q).bind(null,t,"Attribute"),o=_(e);return{setRemoveAttr:r,s:o}}function V(t,e){let n=_(this);return N(n,e,(r,o)=>t.classList.toggle(r,o===-1?void 0:!!o)),t}function dt(t){return Array.from(t.children).forEach(e=>e.remove()),t}function J(t,e,n,r){return t instanceof a.H?t[e+"Attribute"](n,r):t[e+"AttributeNS"](null,n,r)}function K(t,e){if(!Reflect.has(t,e))return!1;let n=U(t,e);return!E(n.set)}function U(t,e){if(t=Object.getPrototypeOf(t),!t)return{};let n=Object.getOwnPropertyDescriptor(t,e);return n||U(t,e)}function N(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 H(t){return Array.isArray(t)?t.filter(Boolean).join(" "):t}function Q(t,e,n,r){return t[(E(r)?"remove":"set")+e](n,H(r))}function X(t,e,n,r,o=null){return t[(E(r)?"remove":"set")+e+"NS"](o,n,H(r))}function q(t,e,n){if(Reflect.set(t,e,n),!!E(n))return Reflect.deleteProperty(t,e)}var m=a.M?Y():new Proxy({},{get(){return()=>{}}});function Y(){let t=new Map,e=!1,n=i=>function(f){for(let u of f)if(u.type==="childList"){if(p(u.addedNodes,!0)){i();continue}y(u.removedNodes,!0)&&i()}},r=new a.M(n(d));return{observe(i){let f=new a.M(n(()=>{}));return f.observe(i,{childList:!0,subtree:!0}),()=>f.disconnect()},onConnected(i,f){s();let u=c(i);u.connected.has(f)||(u.connected.add(f),u.length_c+=1)},offConnected(i,f){if(!t.has(i))return;let u=t.get(i);u.connected.has(f)&&(u.connected.delete(f),u.length_c-=1,o(i,u))},onDisconnected(i,f){s();let u=c(i);u.disconnected.has(f)||(u.disconnected.add(f),u.length_d+=1)},offDisconnected(i,f){if(!t.has(i))return;let u=t.get(i);u.disconnected.has(f)&&(u.disconnected.delete(f),u.length_d-=1,o(i,u))}};function o(i,f){f.length_c||f.length_d||(t.delete(i),d())}function c(i){if(t.has(i))return t.get(i);let f={connected:new WeakSet,length_c:0,disconnected:new WeakSet,length_d:0};return t.set(i,f),f}function s(){e||(e=!0,r.observe(a.D.body,{childList:!0,subtree:!0}))}function d(){!e||t.size||(e=!1,r.disconnect())}function h(){return new Promise(function(i){(requestIdleCallback||requestAnimationFrame)(i)})}async function l(i){t.size>30&&await h();let f=[];if(!(i instanceof Node))return f;for(let u of t.keys())u===i||!(u instanceof Node)||i.contains(u)&&f.push(u);return f}function p(i,f){let u=!1;for(let b of i){if(f&&l(b).then(p),!t.has(b))continue;let w=t.get(b);w.length_c&&(b.dispatchEvent(new Event("dde:connected")),w.connected=new WeakSet,w.length_c=0,w.length_d||t.delete(b),u=!0)}return u}function y(i,f){let u=!1;for(let b of i)f&&l(b).then(y),!(!t.has(b)||!t.get(b).length_d)&&((queueMicrotask||setTimeout)(R(b)),u=!0);return u}function R(i){return()=>{i.isConnected||(i.dispatchEvent(new Event("dde:disconnected")),t.delete(i))}}}function xt(t,e,n,r=et){g.push({scope:t,host:(...s)=>s.length?s.forEach(d=>d(t)):t}),typeof r=="function"&&(r=r.call(t,t));let o=t[x];o||tt(t);let c=n.call(t,r);return o||t.dispatchEvent(new Event("dde:connected")),e.nodeType===11&&typeof e.mode=="string"&&t.addEventListener("dde:disconnected",m.observe(e),{once:!0}),g.pop(),e.append(c)}function tt(t){return M(t.prototype,"connectedCallback",function(e,n,r){e.apply(n,r),n.dispatchEvent(new Event("dde:connected"))}),M(t.prototype,"disconnectedCallback",function(e,n,r){e.apply(n,r),(queueMicrotask||setTimeout)(()=>!n.isConnected&&n.dispatchEvent(new Event("dde:disconnected")))}),M(t.prototype,"attributeChangedCallback",function(e,n,r){let[o,,c]=r;n.dispatchEvent(new CustomEvent("dde:attributeChanged",{detail:[o,c]})),e.apply(n,r)}),t.prototype[x]=!0,t}function M(t,e,n){t[e]=new Proxy(t[e]||(()=>{}),{apply:n})}function et(t){return k(t,(e,n)=>e.getAttribute(n))}function At(t,e,n){return e||(e={}),function(o,...c){n&&(c.unshift(o),o=typeof n=="function"?n():n);let s=c.length?new CustomEvent(t,Object.assign({detail:c[0]},e)):new Event(t,e);return o.dispatchEvent(s)}}function D(t,e,n){return function(o){return o.addEventListener(t,e,n),o}}var nt=new WeakSet;D.connected=function(t,e){let{custom_element:n}=g.current,r="connected";return typeof e!="object"&&(e={}),e.once=!0,function(c){n&&(c=n);let s="dde:"+r;return c.addEventListener(s,t,e),c[x]?c:c.isConnected?(c.dispatchEvent(new Event(s)),c):(O(e.signal,()=>m.offConnected(c,t))&&m.onConnected(c,t),c)}};D.disconnected=function(t,e){let{custom_element:n}=g.current,r="disconnected";return typeof e!="object"&&(e={}),e.once=!0,function(c){n&&(c=n);let s="dde:"+r;return c.addEventListener(s,t,e),c[x]||O(e.signal,()=>m.offDisconnected(c,t))&&m.onDisconnected(c,t),c}};var P=new WeakMap;D.disconnectedAsAbort=function(t){if(P.has(t))return P.get(t);let e=new AbortController;return P.set(t,e),t(D.disconnected(()=>e.abort())),e};D.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[x]||nt.has(o)||!a.M)return o;let s=new a.M(function(h){for(let{attributeName:l,target:p}of h)p.dispatchEvent(new CustomEvent(c,{detail:[l,p.getAttribute(l)]}))});return O(e.signal,()=>s.disconnect())&&s.observe(o,{attributes:!0}),o}};
+globalThis.dde= {assign: C,
+assignAttribute: F,
+chainableAppend: Z,
+classListDeclarative: V,
+createElement: T,
+createElementNS: at,
+customElementRender: xt,
+customElementWithDDE: tt,
+dispatchEvent: At,
+el: T,
+elNS: at,
+elementAttribute: J,
+empty: dt,
+lifecycleToEvents: tt,
+observedAttributes: et,
+on: D,
+registerReactivity: z,
+scope: g,
+simulateSlots: ft
 };
 
 })();
\ No newline at end of file
diff --git a/dist/esm-with-observables.d.ts b/dist/esm-with-observables.d.ts
index 8e755e1..aba4ec8 100644
--- a/dist/esm-with-observables.d.ts
+++ b/dist/esm-with-observables.d.ts
@@ -3,6 +3,7 @@ type Action<V>= (this: { value: V, stopPropagation(): void }, ...a: any[])=> typ
 //type SymbolObservable= Symbol;
 type SymbolOnclear= symbol;
 type Actions<V>= Record<string | SymbolOnclear, Action<V>>;
+type OnListenerOptions= Pick<AddEventListenerOptions, "signal"> & { first_time?: boolean };
 interface observable{
 	_: Symbol
 	/**
@@ -40,7 +41,7 @@ interface observable{
 		...params: A[N] extends (...args: infer P)=> any ? P : never
 	): void;
 	clear(...observables: Observable<any, any>[]): void;
-	on<T>(observable: Observable<T, any>, onchange: (a: T)=> void, options?: AddEventListenerOptions): void;
+	on<T>(observable: Observable<T, any>, onchange: (a: T)=> void, options?: OnListenerOptions): void;
 	symbols: {
 		//observable: SymbolObservable;
 		onclear: SymbolOnclear;
@@ -239,6 +240,7 @@ export function customElementRender<
 	P extends any = Record<string, any>
 >(
 	custom_element: EL,
+	target: ShadowRoot | EL,
 	render: (props: P)=> SupportedElement,
 	props?: P | ((...args: any[])=> P)
 ): EL
diff --git a/dist/esm-with-observables.js b/dist/esm-with-observables.js
index 76ef113..e45d52c 100644
--- a/dist/esm-with-observables.js
+++ b/dist/esm-with-observables.js
@@ -1,4 +1,4 @@
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c.addEventListener(s,t,e),c[A]||T(e.signal,()=>O.offDisconnected(c,t))&&O.onDisconnected(c,t),c}};var H=new WeakMap;y.disconnectedAsAbort=function(t){if(H.has(t))return H.get(t);let e=new AbortController;return H.set(t,e),t(y.disconnected(()=>e.abort())),e};y.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[A]||mt.has(o)||!d.M)return o;let s=new d.M(function(p){for(let{attributeName:l,target:b}of p)b.dispatchEvent(new CustomEvent(c,{detail:[l,b.getAttribute(l)]}))});return T(e.signal,()=>s.disconnect())&&s.observe(o,{attributes:!0}),o}};var h=Symbol.for("observable");function q(t){try{return Reflect.has(t,h)}catch{return!1}}var F=[],g=new WeakMap;function E(t,e){if(typeof t!="function")return et(!1,t,e);if(q(t))return t;let n=et(!0),r=function(){let[o,...c]=g.get(r);if(g.set(r,new Set([o])),F.push(r),st(n,t()),F.pop(),!c.length)return;let s=g.get(r);for(let f of c)s.has(f)||C(f,r)};return g.set(n[h],r),g.set(r,new Set([n])),r(),n}E.action=function(t,e,...n){let r=t[h],{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))};E.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));J(e,n),o&&o.addEventListener("abort",()=>C(e,n))}};E.symbols={onclear:Symbol.for("Observable.onclear")};E.clear=function(...t){for(let n of t){Reflect.deleteProperty(n,"toJSON");let r=n[h];r.onclear.forEach(o=>o.call(r)),e(n,r),Reflect.deleteProperty(n,h)}function e(n,r){r.listeners.forEach(o=>{if(r.listeners.delete(o),!g.has(o))return;let c=g.get(o);c.delete(n),!(c.size>1)&&(n.clear(...c),g.delete(o))})}};var _="__dde_reactive";E.el=function(t,e){let n=L.mark({type:"reactive"},!0),r=n.end,o=d.D.createDocumentFragment();o.append(n,r);let{current:c}=v,s=f=>{if(!n.parentNode||!r.parentNode)return 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This maps attributes to observables (`O.observedAttributes`).
+	* Investigate `__dde_attributes` key of the element.*/let[c,s]=o,f=this[B][c];if(f)return E.action(f,"_set",s)})(t),y.disconnected(function(){/*! This removes all observables mapped to attributes (`O.observedAttributes`).
+	* Investigate `__dde_attributes` key of the element.*/E.clear(...Object.values(this[B]))})(t),n};var rt={isObservable:q,processReactiveAttribute(t,e,n,r){if(!q(n))return n;let o=c=>{if(!t.isConnected)return C(n,o);r(e,c)};return J(n,o),ot(n,o,t,e),n()}};function ot(t,e,...n){let{current:r}=v;r.prevent||r.host(function(o){o[_]||(o[_]=[],y.disconnected(()=>o[_].forEach(([[c,s]])=>C(c,s,c[h]?.host()===o)))(o)),o[_].push([[t,e],...n])})}function et(t,e,n){let r=t?()=>nt(r):(...o)=>o.length?st(r,...o):nt(r);return ct(r,e,n)}var At=Object.assign(Object.create(null),{stopPropagation(){this.skip=!0}}),I=class extends Error{constructor(){super();let[e,...n]=this.stack.split(`
+`),r=e.slice(e.indexOf("@"),e.indexOf(".js:")+4);this.stack=n.find(o=>!o.includes(r))}};function ct(t,e,n){let r=[];Z(n)!=="[object Object]"&&(n={});let{onclear:o}=E.symbols;n[o]&&(r.push(n[o]),Reflect.deleteProperty(n,o));let{host:c}=v;return Reflect.defineProperty(t,h,{value:{value:e,actions:n,onclear:r,host:c,listeners:new Set,defined:new I},enumerable:!1,writable:!1,configurable:!0}),t.toJSON=()=>t(),Object.setPrototypeOf(t[h],At),t}function Ot(){return F[F.length-1]}function nt(t){if(!t[h])return;let{value:e,listeners:n}=t[h],r=Ot();return r&&n.add(r),g.has(r)&&g.get(r).add(t),e}function st(t,e,n){if(!t[h])return;let r=t[h];if(!(!n&&r.value===e))return r.value=e,r.listeners.forEach(o=>o(e)),e}function J(t,e){if(t[h])return t[h].listeners.add(e)}function C(t,e,n){let r=t[h];if(!r)return;let o=r.listeners.delete(e);if(n&&!r.listeners.size){if(E.clear(t),!g.has(r))return o;let c=g.get(r);if(!g.has(c))return o;g.get(c).forEach(s=>C(s,c,!0))}return o}$(rt);export{E as O,k as assign,Q as assignAttribute,ft as chainableAppend,dt as classListDeclarative,L as createElement,Nt as createElementNS,Ut as customElementRender,gt as customElementWithDDE,It as dispatchEvent,L as el,Nt as elNS,pt as elementAttribute,Pt as empty,q as isObservable,gt as lifecycleToEvents,E as observable,Et as observedAttributes,y as on,$ as registerReactivity,v as scope,Lt as simulateSlots};
diff --git a/dist/esm.d.ts b/dist/esm.d.ts
index 8e755e1..aba4ec8 100644
--- a/dist/esm.d.ts
+++ b/dist/esm.d.ts
@@ -3,6 +3,7 @@ type Action<V>= (this: { value: V, stopPropagation(): void }, ...a: any[])=> typ
 //type SymbolObservable= Symbol;
 type SymbolOnclear= symbol;
 type Actions<V>= Record<string | SymbolOnclear, Action<V>>;
+type OnListenerOptions= Pick<AddEventListenerOptions, "signal"> & { first_time?: boolean };
 interface observable{
 	_: Symbol
 	/**
@@ -40,7 +41,7 @@ interface observable{
 		...params: A[N] extends (...args: infer P)=> any ? P : never
 	): void;
 	clear(...observables: Observable<any, any>[]): void;
-	on<T>(observable: Observable<T, any>, onchange: (a: T)=> void, options?: AddEventListenerOptions): void;
+	on<T>(observable: Observable<T, any>, onchange: (a: T)=> void, options?: OnListenerOptions): void;
 	symbols: {
 		//observable: SymbolObservable;
 		onclear: SymbolOnclear;
@@ -239,6 +240,7 @@ export function customElementRender<
 	P extends any = Record<string, any>
 >(
 	custom_element: EL,
+	target: ShadowRoot | EL,
 	render: (props: P)=> SupportedElement,
 	props?: P | ((...args: any[])=> P)
 ): EL
diff --git a/dist/esm.js b/dist/esm.js
index 450f448..6fbed7e 100644
--- a/dist/esm.js
+++ b/dist/esm.js
@@ -1 +1 @@
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x="__dde_lifecycleToEvents";var g=[{get scope(){return a.D.body},host:t=>t?t(a.D.body):a.D.body,custom_element:!1,prevent:!0}],v={get current(){return g[g.length-1]},get host(){return this.current.host},preventDefault(){let{current:t}=this;return t.prevent=!0,t},get state(){return[...g]},push(t={}){return g.push(Object.assign({},this.current,{prevent:!1},t))},pushRoot(){return g.push(g[0])},pop(){if(g.length!==1)return g.pop()}};function k(...t){return this.appendOriginal(...t),this}function I(t){return t.append===k||(t.appendOriginal=t.append,t.append=k),t}var O;function L(t,e,...n){let r=D(this),o=0,c,i;switch((Object(e)!==e||r.isObservable(e))&&(e={textContent:e}),!0){case typeof t=="function":{o=1,v.push({scope:t,host:(...h)=>h.length?(o===1?n.unshift(...h):h.forEach(l=>l(i)),void 0):i}),c=t(e||void 0);let d=c instanceof a.F;if(c.nodeName==="#comment")break;let p=L.mark({type:"component",name:t.name,host:d?"this":"parentElement"});c.prepend(p),d&&(i=p);break}case 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