diff --git a/dist/dde-with-observables.js b/dist/dde-with-observables.js
index f6eb9fd..ab373da 100644
--- a/dist/dde-with-observables.js
+++ b/dist/dde-with-observables.js
@@ -1,30 +1,30 @@
 //deka-dom-el library is available via global namespace `dde`
 (()=> {
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+assign: w,
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-createElement: w,
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+createElement: R,
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-dispatchEvent: Tt,
-el: w,
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+dispatchEvent: Mt,
+el: R,
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 empty: St,
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+isObservable: T,
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+on: x,
+registerReactivity: F,
+scope: v,
 simulateSlots: Rt
 };
 
diff --git a/dist/dde.js b/dist/dde.js
index bc6f3ec..ffa2ece 100644
--- a/dist/dde.js
+++ b/dist/dde.js
@@ -1,24 +1,24 @@
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diff --git a/dist/esm-with-observables.js b/dist/esm-with-observables.js
index dba3aee..62191a3 100644
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diff --git a/dist/esm.js b/dist/esm.js
index b977011..28a238c 100644
--- a/dist/esm.js
+++ b/dist/esm.js
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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 L(...t){return this.appendOriginal(...t),this}function B(t){return t.append===L||(t.appendOriginal=t.append,t.append=L),t}var C;function N(t,e,...n){let c=_(this),r=0,o,s;switch((Object(e)!==e||c.isObservable(e))&&(e={textContent:e}),!0){case typeof t=="function":{r=1,v.push({scope:t,host:(...b)=>b.length?(r===1?n.unshift(...b):b.forEach(h=>h(s)),void 0):s}),o=t(e||void 0);let d=o instanceof a.F;if(o.nodeName==="#comment")break;let l=N.mark({type:"component",name:t.name,host:d?"this":"parentElement"});o.prepend(l),d&&(s=l);break}case t==="#text":o=A.call(this,a.D.createTextNode(""),e);break;case(t==="<>"||!t):o=A.call(this,a.D.createDocumentFragment(),e);break;case!!C:o=A.call(this,a.D.createElementNS(C,t),e);break;case!o:o=A.call(this,a.D.createElement(t),e)}return B(o),s||(s=o),n.forEach(d=>d(s)),r&&v.pop(),r=2,o}function st(t,e=t,n=void 0){let c=Symbol.for("default"),r=Array.from(e.querySelectorAll("slot")).reduce((s,d)=>Reflect.set(s,d.name||c,d)&&s,{}),o=Reflect.has(r,c);if(t.append=new Proxy(t.append,{apply(s,d,l){if(!l.length)return t;let b=a.D.createDocumentFragment();for(let h of l){if(!h||!h.slot){o&&b.appendChild(h);continue}let i=h.slot,f=r[i];G(h,"remove","slot"),f&&(I(f,h,n),Reflect.deleteProperty(r,i))}return o&&(r[c].replaceWith(b),Reflect.deleteProperty(r,c)),t.append=s,t}}),t!==e){let s=Array.from(t.childNodes);s.forEach(d=>d.remove()),t.append(...s)}return e}function I(t,e,n){n&&n(t,e);try{t.replaceWith(A(e,{className:[e.className,t.className],dataset:{...t.dataset}}))}catch{t.replaceWith(e)}}N.mark=function(t,e=!1){t=Object.entries(t).map(([r,o])=>r+`="${o}"`).join(" ");let n=e?"":"/",c=a.D.createComment(`<dde:mark ${t}${a.ssr}${n}>`);return e||(c.end=a.D.createComment("</dde:mark>")),c};function it(t){let e=this;return function(...c){C=t;let r=N.call(e,...c);return C=void 0,r}}var D=new WeakMap,{setDeleteAttr:M}=a;function A(t,...e){if(!e.length)return t;D.set(t,F(t,this));for(let[n,c]of Object.entries(Object.assign({},...e)))j.call(this,t,n,c);return D.delete(t),t}function j(t,e,n){let{setRemoveAttr:c,s:r}=F(t,this),o=this;n=r.processReactiveAttribute(t,e,n,(d,l)=>j.call(o,t,d,l));let[s]=e;if(s==="=")return c(e.slice(1),n);if(s===".")return W(t,e.slice(1),n);if(/(aria|data)([A-Z])/.test(e))return e=e.replace(/([a-z])([A-Z])/g,"$1-$2").toLowerCase(),c(e,n);switch(e==="className"&&(e="class"),e){case"xlink:href":return c(e,n,"http://www.w3.org/1999/xlink");case"textContent":return M(t,e,n);case"style":if(typeof n!="object")break;case"dataset":return S(r,n,W.bind(null,t[e]));case"ariaset":return S(r,n,(d,l)=>c("aria-"+d,l));case"classList":return Z.call(o,t,n)}return V(t,e)?M(t,e,n):c(e,n)}function F(t,e){if(D.has(t))return D.get(t);let c=(t instanceof a.S?K:J).bind(null,t,"Attribute"),r=_(e);return{setRemoveAttr:c,s:r}}function Z(t,e){let n=_(this);return S(n,e,(c,r)=>t.classList.toggle(c,r===-1?void 0:!!r)),t}function ft(t){return Array.from(t.children).forEach(e=>e.remove()),t}function G(t,e,n,c){return t instanceof a.H?t[e+"Attribute"](n,c):t[e+"AttributeNS"](null,n,c)}function V(t,e){if(!Reflect.has(t,e))return!1;let n=$(t,e);return!E(n.set)}function $(t,e){if(t=Object.getPrototypeOf(t),!t)return{};let n=Object.getOwnPropertyDescriptor(t,e);return n||$(t,e)}function S(t,e,n){if(!(typeof e!="object"||e===null))return Object.entries(e).forEach(function([r,o]){r&&(o=t.processReactiveAttribute(e,r,o,n),n(r,o))})}function k(t){return Array.isArray(t)?t.filter(Boolean).join(" "):t}function J(t,e,n,c){return t[(E(c)?"remove":"set")+e](n,k(c))}function K(t,e,n,c,r=null){return t[(E(c)?"remove":"set")+e+"NS"](r,n,k(c))}function W(t,e,n){if(Reflect.set(t,e,n),!!E(n))return Reflect.deleteProperty(t,e)}function pt(t,e,n=Q){v.push({scope:t,host:(...r)=>r.length?r.forEach(o=>o(t)):t,custom_element:t}),typeof n=="function"&&(n=n.call(t,t));let c=e.call(t,n);return v.pop(),c}function lt(t){for(let n of["connected","disconnected"])U(t.prototype,n+"Callback",function(c,r,o){c.apply(r,o),r.dispatchEvent(new Event("dde:"+n))});let e="attributeChanged";return U(t.prototype,e+"Callback",function(n,c,r){let[o,,s]=r;c.dispatchEvent(new CustomEvent("dde:"+e,{detail:[o,s]})),n.apply(c,r)}),t.prototype.__dde_lifecycleToEvents=!0,t}function U(t,e,n){t[e]=new Proxy(t[e]||(()=>{}),{apply:n})}function Q(t){return T(t,(e,n)=>e.getAttribute(n))}function vt(t,e,n){return e||(e={}),function(r,...o){n&&(o.unshift(r),r=typeof n=="function"?n():n);let s=o.length?new CustomEvent(t,Object.assign({detail:o[0]},e)):new Event(t,e);return r.dispatchEvent(s)}}function y(t,e,n){return function(r){return r.addEventListener(t,e,n),r}}var R=a.M?Y():new Proxy({},{get(){return()=>{}}}),X=new WeakSet;y.connected=function(t,e){let{custom_element:n}=v.current,c="connected";return typeof e!="object"&&(e={}),e.once=!0,function(o){n&&(o=n);let s="dde:"+c;return o.addEventListener(s,t,e),o.__dde_lifecycleToEvents?o:o.isConnected?(o.dispatchEvent(new Event(s)),o):(w(e.signal,()=>R.offConnected(o,t))&&R.onConnected(o,t),o)}};y.disconnected=function(t,e){let{custom_element:n}=v.current,c="disconnected";return typeof e!="object"&&(e={}),e.once=!0,function(o){n&&(o=n);let s="dde:"+c;return o.addEventListener(s,t,e),o.__dde_lifecycleToEvents||w(e.signal,()=>R.offDisconnected(o,t))&&R.onDisconnected(o,t),o}};var P=new WeakMap;y.disconnectedAsAbort=function(t){if(P.has(t))return P.get(t);let e=new AbortController;return P.set(t,e),t(y.disconnected(()=>e.abort())),e};y.attributeChanged=function(t,e){let n="attributeChanged";return typeof e!="object"&&(e={}),function(r){let o="dde:"+n;if(r.addEventListener(o,t,e),r.__dde_lifecycleToEvents||X.has(r)||!a.M)return r;let s=new a.M(function(l){for(let{attributeName:b,target:h}of l)h.dispatchEvent(new CustomEvent(o,{detail:[b,h.getAttribute(b)]}))});return w(e.signal,()=>s.disconnect())&&s.observe(r,{attributes:!0}),r}};function Y(){let t=new Map,e=!1,n=new a.M(function(i){for(let f of i)if(f.type==="childList"){if(b(f.addedNodes,!0)){s();continue}h(f.removedNodes,!0)&&s()}});return{onConnected(i,f){o();let u=r(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,c(i,u))},onDisconnected(i,f){o();let u=r(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,c(i,u))}};function c(i,f){f.length_c||f.length_d||(t.delete(i),s())}function r(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 o(){e||(e=!0,n.observe(a.D.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 l(i,f){t.size>30&&await d();let u=[];if(!(i instanceof Node))return u;for(let p of t.keys())p===i||!(p instanceof Node)||f(p)||i.contains(p)&&u.push(p);return u}function b(i,f){let u=!1;for(let p of i){if(f&&l(p,O=>!O.isConnectedd).then(b),!t.has(p))continue;let x=t.get(p);x.length_c&&(p.dispatchEvent(new Event("dde:connected")),x.connected=new WeakSet,x.length_c=0,x.length_d||t.delete(p),u=!0)}return u}function h(i,f){let u=!1;for(let p of i)f&&l(p,O=>O.isConnectedd).then(h),!(!t.has(p)||!t.get(p).length_d)&&(p.dispatchEvent(new Event("dde:disconnected")),t.delete(p),u=!0);return u}}export{A as assign,j as assignAttribute,B as chainableAppend,Z as classListDeclarative,N as createElement,it as createElementNS,pt as customElementRender,lt as customElementWithDDE,vt as dispatchEvent,N as el,it as elNS,G as elementAttribute,ft as empty,lt as lifecycleToEvents,Q as observedAttributes,y as on,q as registerReactivity,v as scope,st as simulateSlots};
diff --git a/jsdom.d.ts b/jsdom.d.ts
index a623a93..95172b3 100644
--- a/jsdom.d.ts
+++ b/jsdom.d.ts
@@ -1,5 +1,13 @@
 import { el, assign, on } from "./index.d";
 export * from "./index.d";
+type JSDOM= {
+	window: Window,
+	document: Document,
+	HTMLElement: typeof HTMLElement,
+	SVGElement: typeof SVGElement,
+	DocumentFragment: typeof DocumentFragment,
+	MutationObserver?: typeof MutationObserver
+};
 export function register(dom: JSDOM): Promise<{
 	el: typeof el,
 	assign: typeof assign,
diff --git a/jsdom.js b/jsdom.js
index cb513e2..f71ab97 100644
--- a/jsdom.js
+++ b/jsdom.js
@@ -1,23 +1,25 @@
 //TODO: https://www.npmjs.com/package/html-element
-import { enviroment } from './src/dom-common.js';
-enviroment.ssr= " ssr";
-const { setDeleteAttr }= enviroment;
+import { enviroment as env } from './src/dom-common.js';
+env.ssr= " ssr";
+const { setDeleteAttr }= env;
 /** @param {HTMLElement} obj */
-enviroment.setDeleteAttr= function(obj, prop, value){
+env.setDeleteAttr= function(obj, prop, value){
 	if("value"===prop) return obj.setAttribute(prop, value);
 	if("checked"!==prop) return setDeleteAttr(obj, prop, value);
 	if(value) return obj.setAttribute(prop, "");
 	obj.removeAttribute(prop);
 };
-const keys= [ "HTMLElement", "SVGElement", "DocumentFragment", "MutationObserver", "document" ];
+const keys= { H: "HTMLElement", S: "SVGElement", F: "DocumentFragment", M: "MutationObserver", D: "document" };
+let env_bk= {};
 let dom_last;
 
-export function register(dom, keys_aditional= []){
+export function register(dom){
 	if(dom_last!==dom){
-		keys.push(...keys_aditional);
 		const w= dom.window;
-		keys.forEach(key=> globalThis[key]= w[key]);
-		globalThis.window= w;
+		Object.entries(keys).forEach(([ kE, kW ])=> {
+			env_bk[kE]= env[kE];
+			env[kE]= w[kW];
+		});
 		w.console= globalThis.console;
 	}
 	dom_last= dom;
@@ -28,8 +30,8 @@ export function unregister(){
 	if(!dom_last)
 		return false;
 	
-	keys.forEach(key=> Reflect.deleteProperty(globalThis, key));
-	Reflect.deleteProperty(globalThis, "window");
+	Object.assign(env, env_bk);
+	env_bk= {};
 	dom_last= undefined;
 	return true;
 }
diff --git a/package.json b/package.json
index 197408d..0ae939c 100644
--- a/package.json
+++ b/package.json
@@ -59,7 +59,7 @@
 	"size-limit": [
 		{
 			"path": "./index.js",
-			"limit": "9.9 kB",
+			"limit": "10 kB",
 			"gzip": false,
 			"brotli": false
 
diff --git a/src/dom-common.js b/src/dom-common.js
index 75c5cbb..fa7d2a0 100644
--- a/src/dom-common.js
+++ b/src/dom-common.js
@@ -1,4 +1,12 @@
-export const enviroment= { setDeleteAttr, ssr: "" };
+export const enviroment= {
+	setDeleteAttr,
+	ssr: "",
+	D: globalThis.document,
+	F: globalThis.DocumentFragment,
+	H: globalThis.HTMLElement,
+	S: globalThis.SVGElement,
+	M: globalThis.MutationObserver,
+};
 import { isUndef } from './helpers.js';
 function setDeleteAttr(obj, prop, val){
 	/* Issue
@@ -13,7 +21,7 @@ function setDeleteAttr(obj, prop, val){
 	Reflect.set(obj, prop, val);
 	if(!isUndef(val)) return;
 	Reflect.deleteProperty(obj, prop);
-	if(obj instanceof HTMLElement && obj.getAttribute(prop)==="undefined")
+	if(obj instanceof enviroment.H && obj.getAttribute(prop)==="undefined")
 		return obj.removeAttribute(prop);
 	if(Reflect.get(obj, prop)==="undefined")
 		return Reflect.set(obj, prop, "");
diff --git a/src/dom.js b/src/dom.js
index 9682d7b..163695d 100644
--- a/src/dom.js
+++ b/src/dom.js
@@ -1,10 +1,10 @@
 import { observables } from "./observables-common.js";
-import { enviroment } from './dom-common.js';
+import { enviroment as env } from './dom-common.js';
 
 /** @type {{ scope: object, prevent: boolean, host: function }[]} */
 const scopes= [ {
-	scope: document.body,
-	host: c=> c ? c(document.body) : document.body,
+	get scope(){ return  env.D.body; },
+	host: c=> c ? c(env.D.body) : env.D.body,
 	custom_element: false,
 	prevent: true,
 } ];
@@ -43,7 +43,7 @@ export function createElement(tag, attributes, ...addons){
 			scoped= 1;
 			scope.push({ scope: tag, host: (...c)=> c.length ? (scoped===1 ? addons.unshift(...c) : c.forEach(c=> c(el_host)), undefined) : el_host });
 			el= tag(attributes || undefined);
-			const is_fragment= el instanceof DocumentFragment;
+			const is_fragment= el instanceof env.F;
 			if(el.nodeName==="#comment") break;
 			const el_mark= createElement.mark({
 				type: "component",
@@ -54,10 +54,10 @@ export function createElement(tag, attributes, ...addons){
 			if(is_fragment) el_host= el_mark;
 			break;
 		}
-		case tag==="#text":      el= assign.call(this, document.createTextNode(""), attributes); break;
-		case tag==="<>" || !tag: el= assign.call(this, document.createDocumentFragment(), attributes); break;
-		case Boolean(namespace): el= assign.call(this, document.createElementNS(namespace, tag), attributes); break;
-		case !el:                el= assign.call(this, document.createElement(tag), attributes);
+		case tag==="#text":      el= assign.call(this, env.D.createTextNode(""), attributes); break;
+		case tag==="<>" || !tag: el= assign.call(this, env.D.createDocumentFragment(), attributes); break;
+		case Boolean(namespace): el= assign.call(this, env.D.createElementNS(namespace, tag), attributes); break;
+		case !el:                el= assign.call(this, env.D.createElement(tag), attributes);
 	}
 	chainableAppend(el);
 	if(!el_host) el_host= el;
@@ -76,7 +76,7 @@ export function simulateSlots(element, root= element, mapper= undefined){
 		apply(orig, _, els){
 			if(!els.length) return element;
 
-			const d= document.createDocumentFragment();
+			const d= env.D.createDocumentFragment();
 			for(const el of els){
 				if(!el || !el.slot){ if(has_d) d.appendChild(el); continue; }
 				const name= el.slot;
@@ -113,8 +113,8 @@ function simulateSlotReplace(slot, element, mapper){
 createElement.mark= function(attrs, is_open= false){
 	attrs= Object.entries(attrs).map(([ n, v ])=> n+`="${v}"`).join(" ");
 	const end= is_open ? "" : "/";
-	const out= document.createComment(`<dde:mark ${attrs}${enviroment.ssr}${end}>`);
-	if(!is_open) out.end= document.createComment("</dde:mark>");
+	const out= env.D.createComment(`<dde:mark ${attrs}${env.ssr}${end}>`);
+	if(!is_open) out.end= env.D.createComment("</dde:mark>");
 	return out;
 };
 export { createElement as el };
@@ -131,8 +131,8 @@ export function createElementNS(ns){
 }
 export { createElementNS as elNS };
 
-const { setDeleteAttr }= enviroment;
 const assign_context= new WeakMap();
+const { setDeleteAttr }= env;
 export function assign(element, ...attributes){
 	if(!attributes.length) return element;
 	assign_context.set(element, assignContext(element, this));
@@ -175,7 +175,7 @@ export function assignAttribute(element, key, value){
 }
 function assignContext(element, _this){
 	if(assign_context.has(element)) return assign_context.get(element);
-	const is_svg= element instanceof SVGElement;
+	const is_svg= element instanceof env.S;
 	const setRemoveAttr= (is_svg ? setRemoveNS : setRemove).bind(null, element, "Attribute");
 	const s= observables(_this);
 	return { setRemoveAttr, s };
@@ -192,7 +192,7 @@ export function empty(el){
 	return el;
 }
 export function elementAttribute(element, op, key, value){
-	if(element instanceof HTMLElement)
+	if(element instanceof env.H)
 		return element[op+"Attribute"](key, value);
 	return element[op+"AttributeNS"](null, key, value);
 }
diff --git a/src/events.js b/src/events.js
index 45fb47a..0d6cbd3 100644
--- a/src/events.js
+++ b/src/events.js
@@ -1,4 +1,5 @@
 export { registerReactivity } from './observables-common.js';
+import { enviroment as env } from './dom-common.js';
 
 export function dispatchEvent(name, options, host){
 	if(!options) options= {};
@@ -18,7 +19,9 @@ export function on(event, listener, options){
 	};
 }
 
-const c_ch_o= connectionsChangesObserverConstructor();
+const c_ch_o= env.M ? connectionsChangesObserverConstructor() : new Proxy({}, {
+	get(){ return ()=> {}; }
+});
 const els_attribute_store= new WeakSet();
 import { scope } from "./dom.js";
 import { onAbort } from './helpers.js';
@@ -77,7 +80,9 @@ on.attributeChanged= function(listener, options){
 		if(element.__dde_lifecycleToEvents || els_attribute_store.has(element))
 			return element;
 		
-		const observer= new MutationObserver(function(mutations){
+		if(!env.M) return element;
+		
+		const observer= new env.M(function(mutations){
 			for(const { attributeName, target } of mutations)
 				target.dispatchEvent(
 					new CustomEvent(event, { detail: [ attributeName, target.getAttribute(attributeName) ] }));
@@ -92,7 +97,7 @@ on.attributeChanged= function(listener, options){
 function connectionsChangesObserverConstructor(){
 	const store= new Map();
 	let is_observing= false;
-	const observer= new MutationObserver(function(mutations){
+	const observer= new env.M(function(mutations){
 		for(const mutation of mutations){
 			if(mutation.type!=="childList") continue;
 			if(observerAdded(mutation.addedNodes, true)){
@@ -155,7 +160,7 @@ function connectionsChangesObserverConstructor(){
 	function start(){
 		if(is_observing) return;
 		is_observing= true;
-		observer.observe(document.body, { childList: true, subtree: true });
+		observer.observe(env.D.body, { childList: true, subtree: true });
 	}
 	function stop(){
 		if(!is_observing || store.size) return;
diff --git a/src/observables-lib.js b/src/observables-lib.js
index e2e141d..c2fbb2c 100644
--- a/src/observables-lib.js
+++ b/src/observables-lib.js
@@ -86,12 +86,13 @@ observable.clear= function(...observables){
 	}
 };
 const key_reactive= "__dde_reactive";
-import { el, elementAttribute } from "./dom.js";
+import { enviroment as env } from "./dom-common.js";
+import { el } from "./dom.js";
 import { scope } from "./dom.js";
 observable.el= function(o, map){
 	const mark_start= el.mark({ type: "reactive" }, false);
 	const mark_end= mark_start.end;
-	const out= document.createDocumentFragment();
+	const out= env.D.createDocumentFragment();
 	out.append(mark_start, mark_end);
 	const { current }= scope;
 	const reRenderReactiveElement= v=> {