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<!DOCTYPE html>
<title>Nested @layers</title>
<link rel="help" href="https://drafts.csswg.org/css-nesting/#nested-group-rules">
<link rel="help" href="https://drafts.csswg.org/css-cascade-5/#layering">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<style>
.a {
/* This should have no effect. Only at-rules containing style rules
are vaild when nested. */
@layer theme, base;
}
/* The theme layer wins over the base layer. */
@layer base, theme;
.a {
@layer theme {
& {
z-index: 1;
}
.b {
background-color: green;
}
}
}
@layer base {
.a {
z-index: 0;
}
.a .b {
background-color: red;
}
}
</style>
<main>
<div class="a">
<div class="b">
</div>
</div>
</main>
<script>
test(() => {
let a = document.querySelector("main > .a");
let b = document.querySelector("main > .a > .b");
assert_equals(getComputedStyle(a).zIndex, "1");
assert_equals(getComputedStyle(b).backgroundColor, "rgb(0, 128, 0)");
}, '@layer can be nested');
</script>
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