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<!DOCTYPE html>
<html>
<head>
<title>CSS Mixins: Shadow DOM</title>
<link rel="help" href="https://drafts.csswg.org/css-mixins-1/#defining-mixins">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<style>
@mixin --exists-only-outside-shadow() {
color: green;
}
#e4 {
color: green;
@apply --in-shadow;
}
</style>
</head>
<body>
<div id="host">
<template shadowrootmode="open">
<style>
#e1 {
color: red;
@apply --exists-only-outside-shadow;
}
#e2 {
color: red;
@apply --m1;
}
#e3 {
color: red;
@apply --exists-only-in-adopted;
}
</style>
<style>
@mixin --m1() {
color: green;
}
@mixin --in-shadow() {
color: red;
}
</style>
<div id="e1">This text should be green.</div>
<div id="e2">This text should be green.</div>
<div id="e3">This text should be green.</div>
</template>
</div>
<div id="e4">This text should be green.</div>
<script>
const sheet = new CSSStyleSheet();
sheet.replaceSync('@mixin --exists-only-in-adopted() { color: green; }');
document.getElementById('host').shadowRoot.adoptedStyleSheets = [sheet];
test(() => {
let target = document.getElementById('host').shadowRoot.getElementById('e1');
assert_equals(getComputedStyle(target).color, 'rgb(0, 128, 0)');
}, 'Style in shadow DOM should have access to outside non-adopted mixins');
test(() => {
let target = document.getElementById('host').shadowRoot.getElementById('e2');
assert_equals(getComputedStyle(target).color, 'rgb(0, 128, 0)');
}, 'Style in shadow DOM should have access to inside mixins');
test(() => {
let target = document.getElementById('host').shadowRoot.getElementById('e3');
assert_equals(getComputedStyle(target).color, 'rgb(0, 128, 0)');
}, 'Style in shadow DOM should have access to mixins from adopted stylesheets');
test(() => {
let target = document.getElementById('e4');
assert_equals(getComputedStyle(target).color, 'rgb(0, 128, 0)');
}, 'Style outside shadow DOM should _not_ have access to inside mixins');
</script>
</body>
</html>
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