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Reapply "Support @contents in mixins." #54148

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Reapply "Support @contents in mixins." #54148

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87 changes: 87 additions & 0 deletions css/css-mixins/contents-rule.html
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Original file line number Diff line number Diff line change
@@ -0,0 +1,87 @@
<!DOCTYPE html>
<html>
<head>
<title>CSS Mixins: Mixins depending on other mixins</title>
<link rel="help" href="https://drafts.csswg.org/css-mixins-1/#apply-rule">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<style>
@mixin --m1(@contents) {
@contents;
}
#e1 {
color: red;
@apply --m1 { color: green; }
}

@mixin --m2(@contents) {
@contents
}
#e2 {
color: red;
@apply --m1 { color: green; }
}

@mixin --m3(@contents) {
&.a {
@contents { color: blue; }
}
}
.b {
color: red;
@apply --m3 { color: green; }
}

@mixin --m4(@contents) {
&.c {
@contents { color: green; }
}
}
.d {
color: red;
@apply --m4;
}

@mixin --m5 {
@contents { color: red !important; }
color: green;
}
#e4 {
@apply --m5 { color: red !important; }
}
</style>
</head>
<body>
<div id="e1">This text should be green.</div>
<div id="e2">This text should be green.</div>
<div class="a b" id="e3">This text should be green.</div>
<div class="c d" id="e4">This text should be green.</div>
<div id="e5">This text should be green.</div>
<script>
test(() => {
let target = document.getElementById('e1');
assert_equals(getComputedStyle(target).color, 'rgb(0, 128, 0)');
}, 'Simple @contents with no fallback');

test(() => {
let target = document.getElementById('e2');
assert_equals(getComputedStyle(target).color, 'rgb(0, 128, 0)');
}, 'Implicit semicolon after @contents, at end of block');

test(() => {
let target = document.getElementById('e3');
assert_equals(getComputedStyle(target).color, 'rgb(0, 128, 0)');
}, 'Block in @apply overrides fallback');

test(() => {
let target = document.getElementById('e4');
assert_equals(getComputedStyle(target).color, 'rgb(0, 128, 0)');
}, 'Fallback is used if @apply has no block');

test(() => {
let target = document.getElementById('e5');
assert_equals(getComputedStyle(target).color, 'rgb(0, 128, 0)');
}, '@contents is ignored if there is no @contents parameter');
</script>
</body>
</html>