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<!DOCTYPE html>
<link rel="author" title="David Shin" href="mailto:dshin@mozilla.com">
<link rel="help" href="drafts.csswg.org/css-cascade-6/#scoped-styles">
<link rel="help" href="https://drafts.csswg.org/css-shadow-parts/#part">
<link rel="match" href="scope-part-ref.html">
<link rel="help" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1908279">
<meta name="assert" content="Implicit @scope rule lets ::part selector to match inside the shadow tree">
<template id="custom-element">
<style>
:host {
display: block;
}
div {
padding: 5px;
}
</style>
<slot></slot>
<div part="a"></div>
<div part="b"></div>
</template>
<template id="custom-element-wrapper">
<style>
:host {
display: block;
}
div {
padding: 5px;
}
</style>
<custom-element exportparts="a"></custom-element>
</template>
<custom-element>
<style>
@scope {
:scope {
background: red;
}
}
</style>
</custom-element>
<custom-element>
<style>
@scope {
:scope::part(a), :scope::part(b) {
background: blue;
}
}
</style>
</custom-element>
<custom-element>
<style>
@scope {
:scope::part(a), :scope::part(b) {
background: red;
}
}
</style>
<custom-element>
<style>
@scope {
:scope::part(a), :scope::part(b) {
background: blue;
}
}
</style>
</custom-element>
</custom-element>
<custom-element-wrapper>
<style slot="s">
@scope {
:scope::part(a) {
background: blue;
}
:scope::part(b) {
background: red;
}
}
</style>
</custom-element-wrapper>
<div>
<template shadowrootmode=open>
<!-- Inside a shadow root -->
<custom-element-wrapper>
<style slot="a">
@scope {
:scope::part(a) {
background: blue;
}
}
</style>
</custom-element-wrapper>
</template>
</div>
<div>
<template shadowrootmode=open>
<!-- Shadow root & host at the same time -->
<div style="padding: 5px;">
<template shadowrootmode=open>
<div></div>
</template>
<style>
@scope {
:scope {
background: red;
}
}
</style>
</div>
</template>
</div>
<script>
customElements.define(
"custom-element",
class extends HTMLElement {
constructor() {
super();
let template = document.getElementById("custom-element");
let templateContent = template.content;
const shadowRoot = this.attachShadow({ mode: "open" });
shadowRoot.appendChild(templateContent.cloneNode(true));
}
},
);
customElements.define(
"custom-element-wrapper",
class extends HTMLElement {
constructor() {
super();
let template = document.getElementById("custom-element-wrapper");
let templateContent = template.content;
const shadowRoot = this.attachShadow({ mode: "open" });
shadowRoot.appendChild(templateContent.cloneNode(true));
}
},
);
</script>
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