diff --git a/.eslintignore b/.eslintignore
index d21b895c0..00d3b279c 100644
--- a/.eslintignore
+++ b/.eslintignore
@@ -8,3 +8,6 @@ _site-dev
 _site
 docs/_merged_*
 patches/
+
+/docs/_assets/scoped-custom-element-registry.min.js
+/docs/_assets/scoped-custom-element-registry.min.js.map
diff --git a/.prettierignore b/.prettierignore
index bc9266d1b..6a88a053a 100644
--- a/.prettierignore
+++ b/.prettierignore
@@ -4,3 +4,6 @@ bundlesize/
 _site
 _site-dev
 .history
+
+/docs/_assets/scoped-custom-element-registry.min.js
+/docs/_assets/scoped-custom-element-registry.min.js.map
diff --git a/docs/_assets/scoped-custom-element-registry.min.js b/docs/_assets/scoped-custom-element-registry.min.js
new file mode 100644
index 000000000..56089818f
--- /dev/null
+++ b/docs/_assets/scoped-custom-element-registry.min.js
@@ -0,0 +1,37 @@
+(function(){
+/*
+
+ Copyright (c) 2020 The Polymer Project Authors. All rights reserved.
+ This code may only be used under the BSD style license found at
+ http://polymer.github.io/LICENSE.txt
+ The complete set of authors may be found at
+ http://polymer.github.io/AUTHORS.txt
+ The complete set of contributors may be found at
+ http://polymer.github.io/CONTRIBUTORS.txt
+ Code distributed by Google as part of the polymer project is also
+ subject to an additional IP rights grant found at
+ http://polymer.github.io/PATENTS.txt
+*/
+'use strict';function g(b){var c=0;return function(){return c<b.length?{done:!1,value:b[c++]}:{done:!0}}}function h(b){var c="undefined"!=typeof Symbol&&Symbol.iterator&&b[Symbol.iterator];return c?c.call(b):{next:g(b)}}function l(b){if(!(b instanceof Array)){b=h(b);for(var c,a=[];!(c=b.next()).done;)a.push(c.value);b=a}return b}var m="function"==typeof Object.create?Object.create:function(b){function c(){}c.prototype=b;return new c};
+function n(b){b=["object"==typeof globalThis&&globalThis,b,"object"==typeof window&&window,"object"==typeof self&&self,"object"==typeof global&&global];for(var c=0;c<b.length;++c){var a=b[c];if(a&&a.Math==Math)return a}throw Error("Cannot find global object");}
+var p=n(this),q=function(){function b(){function a(){}new a;Reflect.construct(a,[],function(){});return new a instanceof a}if("undefined"!=typeof Reflect&&Reflect.construct){if(b())return Reflect.construct;var c=Reflect.construct;return function(a,d,e){a=c(a,d);e&&Reflect.setPrototypeOf(a,e.prototype);return a}}return function(a,d,e){void 0===e&&(e=a);e=m(e.prototype||Object.prototype);return Function.prototype.apply.call(a,e,d)||e}}(),r;
+if("function"==typeof Object.setPrototypeOf)r=Object.setPrototypeOf;else{var t;a:{var u={a:!0},v={};try{v.__proto__=u;t=v.a;break a}catch(b){}t=!1}r=t?function(b,c){b.__proto__=c;if(b.__proto__!==c)throw new TypeError(b+" is not extensible");return b}:null}var w=r;
+if(!ShadowRoot.prototype.createElement){var x=window.HTMLElement,y=window.customElements.define,z=window.customElements.get,A=window.customElements,B=new WeakMap,C=new WeakMap,D=new WeakMap,E=new WeakMap;window.CustomElementRegistry=function(){this.l=new Map;this.o=new Map;this.i=new Map;this.h=new Map};window.CustomElementRegistry.prototype.define=function(b,c){b=b.toLowerCase();if(void 0!==this.j(b))throw new DOMException("Failed to execute 'define' on 'CustomElementRegistry': the name \""+b+'" has already been used with this registry');
+if(void 0!==this.o.get(c))throw new DOMException("Failed to execute 'define' on 'CustomElementRegistry': this constructor has already been used with this registry");var a=c.prototype.attributeChangedCallback,d=new Set(c.observedAttributes||[]);F(c,d,a);a={g:c,connectedCallback:c.prototype.connectedCallback,disconnectedCallback:c.prototype.disconnectedCallback,adoptedCallback:c.prototype.adoptedCallback,attributeChangedCallback:a,formAssociated:c.formAssociated,formAssociatedCallback:c.prototype.formAssociatedCallback,
+formDisabledCallback:c.prototype.formDisabledCallback,formResetCallback:c.prototype.formResetCallback,formStateRestoreCallback:c.prototype.formStateRestoreCallback,observedAttributes:d};this.l.set(b,a);this.o.set(c,a);d=z.call(A,b);d||(d=G(b),y.call(A,b,d));this===window.customElements&&(D.set(c,a),a.s=d);if(d=this.h.get(b)){this.h.delete(b);d=h(d);for(var e=d.next();!e.done;e=d.next())e=e.value,C.delete(e),H(e,a,!0)}a=this.i.get(b);void 0!==a&&(a.resolve(c),this.i.delete(b));return c};window.CustomElementRegistry.prototype.upgrade=
+function(){I.push(this);A.upgrade.apply(A,arguments);I.pop()};window.CustomElementRegistry.prototype.get=function(b){var c;return null==(c=this.l.get(b))?void 0:c.g};window.CustomElementRegistry.prototype.j=function(b){return this.l.get(b)};window.CustomElementRegistry.prototype.whenDefined=function(b){var c=this.j(b);if(void 0!==c)return Promise.resolve(c.g);var a=this.i.get(b);void 0===a&&(a={},a.promise=new Promise(function(d){return a.resolve=d}),this.i.set(b,a));return a.promise};window.CustomElementRegistry.prototype.m=
+function(b,c,a){var d=this.h.get(c);d||this.h.set(c,d=new Set);a?d.add(b):d.delete(b)};var J;window.HTMLElement=function(){var b=J;if(b)return J=void 0,b;var c=D.get(this.constructor);if(!c)throw new TypeError("Illegal constructor (custom element class must be registered with global customElements registry to be newable)");b=Reflect.construct(x,[],c.s);Object.setPrototypeOf(b,this.constructor.prototype);B.set(b,c);return b};window.HTMLElement.prototype=x.prototype;var G=function(b){function c(){var a=
+Reflect.construct(x,[],this.constructor);Object.setPrototypeOf(a,HTMLElement.prototype);a:{var d=a.getRootNode();if(!(d===document||d instanceof ShadowRoot)){d=I[I.length-1];if(d instanceof CustomElementRegistry){var e=d;break a}d=d.getRootNode();d===document||d instanceof ShadowRoot||(d=(null==(e=E.get(d))?void 0:e.getRootNode())||document)}e=d.customElements}e=e||window.customElements;(d=e.j(b))?H(a,d):C.set(a,e);return a}p.Object.defineProperty(c,"formAssociated",{configurable:!0,enumerable:!0,
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+B.get(this);if(a&&a.formAssociated){var d;null==a||null==(d=a.formAssociatedCallback)||d.apply(this,arguments)}};c.prototype.formDisabledCallback=function(){var a=B.get(this);if(null==a?0:a.formAssociated){var d;null==a||null==(d=a.formDisabledCallback)||d.apply(this,arguments)}};c.prototype.formResetCallback=function(){var a=B.get(this);if(null==a?0:a.formAssociated){var d;null==a||null==(d=a.formResetCallback)||d.apply(this,arguments)}};c.prototype.formStateRestoreCallback=function(){var a=B.get(this);
+if(null==a?0:a.formAssociated){var d;null==a||null==(d=a.formStateRestoreCallback)||d.apply(this,arguments)}};return c},F=function(b,c,a){if(0!==c.size&&void 0!==a){var d=b.prototype.setAttribute;d&&(b.prototype.setAttribute=function(f,k){f=f.toLowerCase();if(c.has(f)){var T=this.getAttribute(f);d.call(this,f,k);a.call(this,f,T,k)}else d.call(this,f,k)});var e=b.prototype.removeAttribute;e&&(b.prototype.removeAttribute=function(f){f=f.toLowerCase();if(c.has(f)){var k=this.getAttribute(f);e.call(this,
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+Element.prototype.attachShadow;Element.prototype.attachShadow=function(b){var c=L.apply(this,arguments);b.customElements&&(c.customElements=b.customElements);return c};var I=[document],M=function(b,c,a){var d=(a?Object.getPrototypeOf(a):b.prototype)[c];b.prototype[c]=function(){I.push(this);var e=d.apply(a||this,arguments);void 0!==e&&E.set(e,this);I.pop();return e}};M(ShadowRoot,"createElement",document);M(ShadowRoot,"importNode",document);M(Element,"insertAdjacentHTML");var N=function(b){var c=
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+}});var RadioNodeList=function(b){var c=q(Array,[].concat(l(b)),this.constructor);c.h=b;return c},Q=RadioNodeList,R=Array;Q.prototype=m(R.prototype);Q.prototype.constructor=Q;if(w)w(Q,R);else for(var S in R)if("prototype"!=S)if(Object.defineProperties){var U=Object.getOwnPropertyDescriptor(R,S);U&&Object.defineProperty(Q,S,U)}else Q[S]=R[S];Q.u=R.prototype;p.Object.defineProperty(RadioNodeList.prototype,"value",{configurable:!0,enumerable:!0,get:function(){var b;return(null==(b=this.h.find(function(c){return!0===
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+{get:function(){var b=V.get.call(this,[]),c=[];b=h(b);for(var a=b.next();!a.done;a=b.next()){a=a.value;var d=B.get(a);d&&!0!==d.formAssociated||c.push(a)}return new HTMLFormControlsCollection(c)}})}};
+}).call(typeof globalThis === 'object' ? globalThis : window);
+
+//# sourceMappingURL=scoped-custom-element-registry.min.js.map
diff --git a/docs/_assets/scoped-custom-element-registry.min.js.map b/docs/_assets/scoped-custom-element-registry.min.js.map
new file mode 100644
index 000000000..985c48e11
--- /dev/null
+++ b/docs/_assets/scoped-custom-element-registry.min.js.map
@@ -0,0 +1 @@
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* @license\n * Copyright (c) 2020 The Polymer Project Authors. All rights reserved.\n * This code may only be used under the BSD style license found at\n * http://polymer.github.io/LICENSE.txt\n * The complete set of authors may be found at\n * http://polymer.github.io/AUTHORS.txt\n * The complete set of contributors may be found at\n * http://polymer.github.io/CONTRIBUTORS.txt\n * Code distributed by Google as part of the polymer project is also\n * subject to an additional IP rights grant found at\n * http://polymer.github.io/PATENTS.txt\n */\nif (!ShadowRoot.prototype.createElement) {\n  const NativeHTMLElement = window.HTMLElement;\n  const nativeDefine = window.customElements.define;\n  const nativeGet = window.customElements.get;\n  const nativeRegistry = window.customElements;\n\n  const definitionForElement = new WeakMap();\n  const pendingRegistryForElement = new WeakMap();\n  const globalDefinitionForConstructor = new WeakMap();\n  // TBD: This part of the spec proposal is unclear:\n  // > Another option for looking up registries is to store an element's\n  // > originating registry with the element. The Chrome DOM team was concerned\n  // > about the small additional memory overhead on all elements. Looking up the\n  // > root avoids this.\n  const scopeForElement = new WeakMap();\n\n  // Constructable CE registry class, which uses the native CE registry to\n  // register stand-in elements that can delegate out to CE classes registered\n  // in scoped registries\n  window.CustomElementRegistry = class {\n    constructor() {\n      this._definitionsByTag = new Map();\n      this._definitionsByClass = new Map();\n      this._whenDefinedPromises = new Map();\n      this._awaitingUpgrade = new Map();\n    }\n\n    define(tagName, elementClass) {\n      tagName = tagName.toLowerCase();\n      if (this._getDefinition(tagName) !== undefined) {\n        throw new DOMException(\n          `Failed to execute 'define' on 'CustomElementRegistry': the name \"${tagName}\" has already been used with this registry`\n        );\n      }\n      if (this._definitionsByClass.get(elementClass) !== undefined) {\n        throw new DOMException(\n          `Failed to execute 'define' on 'CustomElementRegistry': this constructor has already been used with this registry`\n        );\n      }\n      // Since observedAttributes can't change, we approximate it by patching\n      // set/removeAttribute on the user's class\n      const attributeChangedCallback =\n        elementClass.prototype.attributeChangedCallback;\n      const observedAttributes = new Set(elementClass.observedAttributes || []);\n      patchAttributes(\n        elementClass,\n        observedAttributes,\n        attributeChangedCallback\n      );\n      // Register the definition\n      const definition = {\n        elementClass,\n        connectedCallback: elementClass.prototype.connectedCallback,\n        disconnectedCallback: elementClass.prototype.disconnectedCallback,\n        adoptedCallback: elementClass.prototype.adoptedCallback,\n        attributeChangedCallback,\n        'formAssociated': elementClass['formAssociated'],\n        'formAssociatedCallback':\n          elementClass.prototype['formAssociatedCallback'],\n        'formDisabledCallback': elementClass.prototype['formDisabledCallback'],\n        'formResetCallback': elementClass.prototype['formResetCallback'],\n        'formStateRestoreCallback':\n          elementClass.prototype['formStateRestoreCallback'],\n        observedAttributes,\n      };\n      this._definitionsByTag.set(tagName, definition);\n      this._definitionsByClass.set(elementClass, definition);\n      // Register a stand-in class which will handle the registry lookup & delegation\n      let standInClass = nativeGet.call(nativeRegistry, tagName);\n      if (!standInClass) {\n        standInClass = createStandInElement(tagName);\n        nativeDefine.call(nativeRegistry, tagName, standInClass);\n      }\n      if (this === window.customElements) {\n        globalDefinitionForConstructor.set(elementClass, definition);\n        definition.standInClass = standInClass;\n      }\n      // Upgrade any elements created in this scope before define was called\n      const awaiting = this._awaitingUpgrade.get(tagName);\n      if (awaiting) {\n        this._awaitingUpgrade.delete(tagName);\n        for (const element of awaiting) {\n          pendingRegistryForElement.delete(element);\n          customize(element, definition, true);\n        }\n      }\n      // Flush whenDefined callbacks\n      const info = this._whenDefinedPromises.get(tagName);\n      if (info !== undefined) {\n        info.resolve(elementClass);\n        this._whenDefinedPromises.delete(tagName);\n      }\n      return elementClass;\n    }\n\n    upgrade() {\n      creationContext.push(this);\n      nativeRegistry.upgrade.apply(nativeRegistry, arguments);\n      creationContext.pop();\n    }\n\n    get(tagName) {\n      const definition = this._definitionsByTag.get(tagName);\n      return definition?.elementClass;\n    }\n\n    _getDefinition(tagName) {\n      return this._definitionsByTag.get(tagName);\n    }\n\n    whenDefined(tagName) {\n      const definition = this._getDefinition(tagName);\n      if (definition !== undefined) {\n        return Promise.resolve(definition.elementClass);\n      }\n      let info = this._whenDefinedPromises.get(tagName);\n      if (info === undefined) {\n        info = {};\n        info.promise = new Promise((r) => (info.resolve = r));\n        this._whenDefinedPromises.set(tagName, info);\n      }\n      return info.promise;\n    }\n\n    _upgradeWhenDefined(element, tagName, shouldUpgrade) {\n      let awaiting = this._awaitingUpgrade.get(tagName);\n      if (!awaiting) {\n        this._awaitingUpgrade.set(tagName, (awaiting = new Set()));\n      }\n      if (shouldUpgrade) {\n        awaiting.add(element);\n      } else {\n        awaiting.delete(element);\n      }\n    }\n  };\n\n  // User extends this HTMLElement, which returns the CE being upgraded\n  let upgradingInstance;\n  window.HTMLElement = function HTMLElement() {\n    // Upgrading case: the StandInElement constructor was run by the browser's\n    // native custom elements and we're in the process of running the\n    // \"constructor-call trick\" on the natively constructed instance, so just\n    // return that here\n    let instance = upgradingInstance;\n    if (instance) {\n      upgradingInstance = undefined;\n      return instance;\n    }\n    // Construction case: we need to construct the StandInElement and return\n    // it; note the current spec proposal only allows new'ing the constructor\n    // of elements registered with the global registry\n    const definition = globalDefinitionForConstructor.get(this.constructor);\n    if (!definition) {\n      throw new TypeError(\n        'Illegal constructor (custom element class must be registered with global customElements registry to be newable)'\n      );\n    }\n    instance = Reflect.construct(\n      NativeHTMLElement,\n      [],\n      definition.standInClass\n    );\n    Object.setPrototypeOf(instance, this.constructor.prototype);\n    definitionForElement.set(instance, definition);\n    return instance;\n  };\n  window.HTMLElement.prototype = NativeHTMLElement.prototype;\n\n  // Helpers to return the scope for a node where its registry would be located\n  const isValidScope = (node) =>\n    node === document || node instanceof ShadowRoot;\n  const registryForNode = (node) => {\n    // TODO: the algorithm for finding the scope is a bit up in the air; assigning\n    // a one-time scope at creation time would require walking every tree ever\n    // created, which is avoided for now\n    let scope = node.getRootNode();\n    // If we're not attached to the document (i.e. in a disconnected tree or\n    // fragment), we need to get the scope from the creation context; that should\n    // be a Document or ShadowRoot, unless it was created via innerHTML\n    if (!isValidScope(scope)) {\n      const context = creationContext[creationContext.length - 1];\n      // When upgrading via registry.upgrade(), the registry itself is put on the\n      // creationContext stack\n      if (context instanceof CustomElementRegistry) {\n        return context;\n      }\n      // Otherwise, get the root node of the element this was created from\n      scope = context.getRootNode();\n      // The creation context wasn't a Document or ShadowRoot or in one; this\n      // means we're being innerHTML'ed into a disconnected element; for now, we\n      // hope that root node was created imperatively, where we stash _its_\n      // scopeForElement. Beyond that, we'd need more costly tracking.\n      if (!isValidScope(scope)) {\n        scope = scopeForElement.get(scope)?.getRootNode() || document;\n      }\n    }\n    return scope.customElements;\n  };\n\n  // Helper to create stand-in element for each tagName registered that delegates\n  // out to the registry for the given element\n  const createStandInElement = (tagName) => {\n    return class ScopedCustomElementBase {\n      static get ['formAssociated']() {\n        return true;\n      }\n      constructor() {\n        // Create a raw HTMLElement first\n        const instance = Reflect.construct(\n          NativeHTMLElement,\n          [],\n          this.constructor\n        );\n        // We need to install the minimum HTMLElement prototype so that\n        // scopeForNode can use DOM API to determine our construction scope;\n        // upgrade will eventually install the full CE prototype\n        Object.setPrototypeOf(instance, HTMLElement.prototype);\n        // Get the node's scope, and its registry (falls back to global registry)\n        const registry = registryForNode(instance) || window.customElements;\n        const definition = registry._getDefinition(tagName);\n        if (definition) {\n          customize(instance, definition);\n        } else {\n          pendingRegistryForElement.set(instance, registry);\n        }\n        return instance;\n      }\n\n      connectedCallback() {\n        const definition = definitionForElement.get(this);\n        if (definition) {\n          // Delegate out to user callback\n          definition.connectedCallback &&\n            definition.connectedCallback.apply(this, arguments);\n        } else {\n          // Register for upgrade when defined (only when connected, so we don't leak)\n          pendingRegistryForElement\n            .get(this)\n            ._upgradeWhenDefined(this, tagName, true);\n        }\n      }\n\n      disconnectedCallback() {\n        const definition = definitionForElement.get(this);\n        if (definition) {\n          // Delegate out to user callback\n          definition.disconnectedCallback &&\n            definition.disconnectedCallback.apply(this, arguments);\n        } else {\n          // Un-register for upgrade when defined (so we don't leak)\n          pendingRegistryForElement\n            .get(this)\n            ._upgradeWhenDefined(this, tagName, false);\n        }\n      }\n\n      adoptedCallback() {\n        const definition = definitionForElement.get(this);\n        definition?.adoptedCallback?.apply(this, arguments);\n      }\n\n      // Form-associated custom elements lifecycle methods\n      ['formAssociatedCallback']() {\n        const definition = definitionForElement.get(this);\n        if (definition && definition['formAssociated']) {\n          definition?.['formAssociatedCallback']?.apply(this, arguments);\n        }\n      }\n\n      ['formDisabledCallback']() {\n        const definition = definitionForElement.get(this);\n        if (definition?.['formAssociated']) {\n          definition?.['formDisabledCallback']?.apply(this, arguments);\n        }\n      }\n\n      ['formResetCallback']() {\n        const definition = definitionForElement.get(this);\n        if (definition?.['formAssociated']) {\n          definition?.['formResetCallback']?.apply(this, arguments);\n        }\n      }\n\n      ['formStateRestoreCallback']() {\n        const definition = definitionForElement.get(this);\n        if (definition?.['formAssociated']) {\n          definition?.['formStateRestoreCallback']?.apply(this, arguments);\n        }\n      }\n\n      // no attributeChangedCallback or observedAttributes since these\n      // are simulated via setAttribute/removeAttribute patches\n    };\n  };\n\n  // Helper to patch CE class setAttribute/getAttribute to implement\n  // attributeChangedCallback\n  const patchAttributes = (\n    elementClass,\n    observedAttributes,\n    attributeChangedCallback\n  ) => {\n    if (\n      observedAttributes.size === 0 ||\n      attributeChangedCallback === undefined\n    ) {\n      return;\n    }\n    const setAttribute = elementClass.prototype.setAttribute;\n    if (setAttribute) {\n      elementClass.prototype.setAttribute = function (n, value) {\n        const name = n.toLowerCase();\n        if (observedAttributes.has(name)) {\n          const old = this.getAttribute(name);\n          setAttribute.call(this, name, value);\n          attributeChangedCallback.call(this, name, old, value);\n        } else {\n          setAttribute.call(this, name, value);\n        }\n      };\n    }\n    const removeAttribute = elementClass.prototype.removeAttribute;\n    if (removeAttribute) {\n      elementClass.prototype.removeAttribute = function (n) {\n        const name = n.toLowerCase();\n        if (observedAttributes.has(name)) {\n          const old = this.getAttribute(name);\n          removeAttribute.call(this, name);\n          attributeChangedCallback.call(this, name, old, null);\n        } else {\n          removeAttribute.call(this, name);\n        }\n      };\n    }\n  };\n\n  // Helper to patch CE class hierarchy changing those CE classes created before applying the polyfill\n  // to make them work with the new patched CustomElementsRegistry\n  const patchHTMLElement = (elementClass) => {\n    const parentClass = Object.getPrototypeOf(elementClass);\n\n    if (parentClass !== window.HTMLElement) {\n      if (parentClass === NativeHTMLElement) {\n        return Object.setPrototypeOf(elementClass, window.HTMLElement);\n      }\n\n      return patchHTMLElement(parentClass);\n    }\n  };\n\n  // Helper to upgrade an instance with a CE definition using \"constructor call trick\"\n  const customize = (instance, definition, isUpgrade = false) => {\n    Object.setPrototypeOf(instance, definition.elementClass.prototype);\n    definitionForElement.set(instance, definition);\n    upgradingInstance = instance;\n    try {\n      new definition.elementClass();\n    } catch (_) {\n      patchHTMLElement(definition.elementClass);\n      new definition.elementClass();\n    }\n    // Approximate observedAttributes from the user class, since the stand-in element had none\n    definition.observedAttributes.forEach((attr) => {\n      if (instance.hasAttribute(attr)) {\n        definition.attributeChangedCallback.call(\n          instance,\n          attr,\n          null,\n          instance.getAttribute(attr)\n        );\n      }\n    });\n    if (isUpgrade && definition.connectedCallback && instance.isConnected) {\n      definition.connectedCallback.call(instance);\n    }\n  };\n\n  // Patch attachShadow to set customElements on shadowRoot when provided\n  const nativeAttachShadow = Element.prototype.attachShadow;\n  Element.prototype.attachShadow = function (init) {\n    const shadowRoot = nativeAttachShadow.apply(this, arguments);\n    if (init.customElements) {\n      shadowRoot.customElements = init.customElements;\n    }\n    return shadowRoot;\n  };\n\n  // Install scoped creation API on Element & ShadowRoot\n  let creationContext = [document];\n  const installScopedCreationMethod = (ctor, method, from = undefined) => {\n    const native = (from ? Object.getPrototypeOf(from) : ctor.prototype)[\n      method\n    ];\n    ctor.prototype[method] = function () {\n      creationContext.push(this);\n      const ret = native.apply(from || this, arguments);\n      // For disconnected elements, note their creation scope so that e.g.\n      // innerHTML into them will use the correct scope; note that\n      // insertAdjacentHTML doesn't return an element, but that's fine since\n      // it will have a parent that should have a scope\n      if (ret !== undefined) {\n        scopeForElement.set(ret, this);\n      }\n      creationContext.pop();\n      return ret;\n    };\n  };\n  installScopedCreationMethod(ShadowRoot, 'createElement', document);\n  installScopedCreationMethod(ShadowRoot, 'importNode', document);\n  installScopedCreationMethod(Element, 'insertAdjacentHTML');\n\n  // Install scoped innerHTML on Element & ShadowRoot\n  const installScopedCreationSetter = (ctor, name) => {\n    const descriptor = Object.getOwnPropertyDescriptor(ctor.prototype, name);\n    Object.defineProperty(ctor.prototype, name, {\n      ...descriptor,\n      set(value) {\n        creationContext.push(this);\n        descriptor.set.call(this, value);\n        creationContext.pop();\n      },\n    });\n  };\n  installScopedCreationSetter(Element, 'innerHTML');\n  installScopedCreationSetter(ShadowRoot, 'innerHTML');\n\n  // Install global registry\n  Object.defineProperty(window, 'customElements', {\n    value: new CustomElementRegistry(),\n    configurable: true,\n    writable: true,\n  });\n\n  if (\n    !!window['ElementInternals'] &&\n    !!window['ElementInternals'].prototype['setFormValue']\n  ) {\n    const internalsToHostMap = new WeakMap();\n    const attachInternals = HTMLElement.prototype['attachInternals'];\n    const methods = [\n      'setFormValue',\n      'setValidity',\n      'checkValidity',\n      'reportValidity',\n    ];\n\n    HTMLElement.prototype['attachInternals'] = function (...args) {\n      const internals = attachInternals.call(this, ...args);\n      internalsToHostMap.set(internals, this);\n      return internals;\n    };\n\n    methods.forEach((method) => {\n      const proto = window['ElementInternals'].prototype;\n      const originalMethod = proto[method];\n\n      proto[method] = function (...args) {\n        const host = internalsToHostMap.get(this);\n        const definition = definitionForElement.get(host);\n        if (definition['formAssociated'] === true) {\n          originalMethod?.call(this, ...args);\n        } else {\n          throw new DOMException(\n            `Failed to execute ${originalMethod} on 'ElementInternals': The target element is not a form-associated custom element.`\n          );\n        }\n      };\n    });\n\n    // Emulate the native RadioNodeList object\n    class RadioNodeList extends Array {\n      constructor(elements) {\n        super(...elements);\n        this._elements = elements;\n      }\n\n      get ['value']() {\n        return (\n          this._elements.find((element) => element['checked'] === true)\n            ?.value || ''\n        );\n      }\n    }\n\n    // Emulate the native HTMLFormControlsCollection object\n    class HTMLFormControlsCollection {\n      constructor(elements) {\n        const entries = new Map();\n        elements.forEach((element, index) => {\n          const name = element.getAttribute('name');\n          const nameReference = entries.get(name) || [];\n          this[+index] = element;\n          nameReference.push(element);\n          entries.set(name, nameReference);\n        });\n        this['length'] = elements.length;\n        entries.forEach((value, key) => {\n          if (!value) return;\n          if (value.length === 1) {\n            this[key] = value[0];\n          } else {\n            this[key] = new RadioNodeList(value);\n          }\n        });\n      }\n\n      ['namedItem'](key) {\n        return this[key];\n      }\n    }\n\n    // Override the built-in HTMLFormElements.prototype.elements getter\n    const formElementsDescriptor = Object.getOwnPropertyDescriptor(\n      HTMLFormElement.prototype,\n      'elements'\n    );\n\n    Object.defineProperty(HTMLFormElement.prototype, 'elements', {\n      get: function () {\n        const nativeElements = formElementsDescriptor.get.call(this, []);\n\n        const include = [];\n\n        for (const element of nativeElements) {\n          const definition = definitionForElement.get(element);\n\n          // Only purposefully formAssociated elements or built-ins will feature in elements\n          if (!definition || definition['formAssociated'] === true) {\n            include.push(element);\n          }\n        }\n\n        return new HTMLFormControlsCollection(include);\n      },\n    });\n  }\n}\n"]}
\ No newline at end of file
diff --git a/docs/_includes/_joiningBlocks/head/05-polyfills.njk b/docs/_includes/_joiningBlocks/head/05-polyfills.njk
new file mode 100644
index 000000000..68743477d
--- /dev/null
+++ b/docs/_includes/_joiningBlocks/head/05-polyfills.njk
@@ -0,0 +1 @@
+<script src="{{ '/_assets/scoped-custom-element-registry.min.js' | asset | url }}"></script>
diff --git a/package.json b/package.json
index a818211b2..556b7ab9b 100644
--- a/package.json
+++ b/package.json
@@ -61,6 +61,7 @@
     "@web/test-runner-browserstack": "^0.5.0",
     "@web/test-runner-commands": "^0.6.1",
     "@web/test-runner-playwright": "^0.8.8",
+    "@webcomponents/scoped-custom-element-registry": "^0.0.5",
     "@yarnpkg/lockfile": "^1.1.0",
     "babel-polyfill": "^6.26.0",
     "bundlesize": "^1.0.0-beta.2",
diff --git a/yarn.lock b/yarn.lock
index 1d4467b28..84c55c321 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -2967,6 +2967,11 @@
     portfinder "^1.0.28"
     source-map "^0.7.3"
 
+"@webcomponents/scoped-custom-element-registry@^0.0.5":
+  version "0.0.5"
+  resolved "https://registry.yarnpkg.com/@webcomponents/scoped-custom-element-registry/-/scoped-custom-element-registry-0.0.5.tgz#96377f6a5587c76479b90d13deb7674b51b82603"
+  integrity sha512-vtlIyf+b657A1MWY69uTTJaGYwqUS3Lnm0+n2vLyuVf5MYOwSOB3Mx42AyBxz/6t9gw+IDelm1HQFOiA1xZCEQ==
+
 "@webcomponents/shadycss@^1.10.2":
   version "1.10.2"
   resolved "https://registry.yarnpkg.com/@webcomponents/shadycss/-/shadycss-1.10.2.tgz#40e03cab6dc5e12f199949ba2b79e02f183d1e7b"