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/** | |
* Usage: | |
* class FancyButton extends HTMLElement { | |
* constructor() { | |
* super(); | |
* ensureShadowRoot(el); | |
* // if a declarative shadow root was present, it'll be here: | |
* console.log(this.shadowRoot); | |
* } | |
* } | |
*/ | |
function ensureShadowRoot(el) { | |
let mode, t = el.firstElementChild; | |
if (mode = t && t.shadowRoot) { | |
t.remove(); | |
el.attachShadow({mode}).append(...t.childNodes); | |
} | |
} |
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/** | |
* Alternative version that polyfills .attachShadow() with the DSD. | |
* Usage: | |
* class FancyButton extends HTMLElement { | |
* constructor() { | |
* super(); | |
* // if a declarative shadow root was present, it'll be here: | |
* console.log(this.shadowRoot); | |
* } | |
* } | |
*/ | |
var attach = HTMLElement.prototype.attachShadow; | |
Object.defineProperty(HTMLElement.prototype, 'attachShadow', { | |
value(opts) { | |
var t = this.firstElementChild; | |
var mode = t && t.localName==='template' && t.getAttribute('shadowroot'); | |
var shadow = attach.call(this, opts); | |
if (mode) { | |
t.remove(); | |
var c; | |
while (c = t.firstChild) shadow.appendChild(c); | |
} | |
return shadow; | |
} | |
}); |
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