Specs: Simplify the platform by only having one shadow tree per element.

sky/examples/radio.sky

 SKY MODULE - radio button and radio button group
 <!-- accessibility handling not implemented yet, pending mojo service -->
 <import src="sky:core" as="sky"/>
 
 <!-- <radio> -->
 <template id="radio-shadow">
  <style>
   :host { width: 1em; height: 1em; border: solid; background: white; }
   :host[checked] { background: black; }
  </style>
 </template>
 <script>
  module.exports = {};
- module.exports.RadioElement = sky.registerElement('radio', class extends Element {
-   constructor () {
-     super();
-     this.addEventListener('click', (event) => this.checked = true);
-     this.addShadowRoot(new sky.ShadowRoot(module.document.findId('radio-shadow').content.cloneNode(true)));
-   }
-   get checked () {
-     return this.hasAttribute('checked');
-   }
-   set checked (value) {
-     if (value)
-       this.setAttribute('checked', '');
-     else
-       this.removeAttribute('checked');
-   }
-   get value () {
-     return this.getAttribute('name');
-   }
-   set value (value) {
-     this.setAttribute('value', value);
-   }
-   attributeChanged(name, oldValue, newValue) {
-     if ((name == 'checked') && (newValue != null))
-       if (this.parentNode instanceof module.exports.RadioGroupElement)
-         this.parentNode.setChecked(this);
-   }
+ module.exports.RadioElement = sky.registerElement({
+   tagName: 'radio',
+   shadow: true,
+   prototype: class extends Element {
+     constructor () {
+       super();
+       this.addEventListener('click', (event) => this.checked = true);
+       this.shadowRoot.appendChild(module.document.findId('radio-shadow').content.cloneNode(true));
+     }
+     get checked () {
+       return this.hasAttribute('checked');
+     }
+     set checked (value) {
+       if (value)
+         this.setAttribute('checked', '');
+       else
+         this.removeAttribute('checked');
+     }
+     get value () {
+       return this.getAttribute('name');
+     }
+     set value (value) {
+       this.setAttribute('value', value);
+     }
+     attributeChanged(name, oldValue, newValue) {
+       if ((name == 'checked') && (newValue != null))
+         if (this.parentNode instanceof module.exports.RadioGroupElement)
+           this.parentNode.setChecked(this);
+     }
+   },
  });
 </script>
 
 <!-- <radiogroup> -->
 <template id="radiogroup-shadow">
  <style>
   :host { padding: 1em; border: thin solid; }
  </style>
 </template>
 <script>
- module.exports.RadioGroupElement = sky.registerElement('radiogroup', class extends Element {
-   constructor () {
-     super();
-     this.addShadowRoot(new sky.ShadowRoot(module.document.findId('radiogroup-shadow').content.cloneNode(true)));
-   }
-   get value () {
-     let children = this.getChildNodes();
-     for (let child of children)
-       if (child instanceof module.exports.RadioElement)
-         if (child.checked)
-           return child.name;
-     return '';
-   }
-   set value (name) { 
-     let children = this.getChildNodes();
-     for (let child of children)
-       if (child instanceof module.exports.RadioElement)
-         if (child.value == name)
-           child.checked = true;
-   }
-   setChecked(radio) {
-     if (!((radio instanceof module.exports.Radio) && radio.parentNode == this))
-       throw;
-     let children = this.getChildNodes();
-     for (let child of children)
-       if (child instanceof module.exports.RadioElement)
-         if (child != radio)
-           child.checked = false;
-   }
+ module.exports.RadioGroupElement = sky.registerElement({
+   tagName: 'radiogroup',
+   shadow: true,
+   prototype: class extends Element {
+     constructor () {
+       super();
+       this.shadowRoot.appendChild(module.document.findId('radiogroup-shadow').content.cloneNode(true));
+     }
+     get value () {
+       let children = this.getChildNodes();
+       for (let child of children)
+         if (child instanceof module.exports.RadioElement)
+           if (child.checked)
+             return child.name;
+       return '';
+     }
+     set value (name) { 
+       let children = this.getChildNodes();
+       for (let child of children)
+         if (child instanceof module.exports.RadioElement)
+           if (child.value == name)
+             child.checked = true;
+     }
+     setChecked(radio) {
+       if (!((radio instanceof module.exports.Radio) && radio.parentNode == this))
+         throw;
+       let children = this.getChildNodes();
+       for (let child of children)
+         if (child instanceof module.exports.RadioElement)
+           if (child != radio)
+             child.checked = false;
+     }
+   },
  });
 </script>