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[Gecko Bug 2024049] Invalidate container rules from changes in ancestor font metrics. #59437

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Merged
moz-wptsync-bot merged 2 commits into from
Apr 24, 2026
Merged

[Gecko Bug 2024049] Invalidate container rules from changes in ancestor font metrics. #59437

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d168125
Invalidate container rules from changes in ancestor font metrics.
dcrescalante Apr 23, 2026
76e381b
Revert "Bug 2024049 - Add wpts for expected style container query inv…
Apr 23, 2026
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31 changes: 31 additions & 0 deletions css/css-conditional/container-queries/container-size-rem-change.html
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Original file line number Diff line number Diff line change
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<!DOCTYPE html>
<title>@container-dependent elements respond to root metrics size changes</title>
<link rel="help" href="https://drafts.csswg.org/css-conditional-5/#size-container">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="support/cq-testcommon.js"></script>
<style>
:root, body { font-size: 16px; }
#container {
container-type: size;
width: 20px;
}

#target { color: red; }
@container (width < 1rem) {
#target { color: green; }
}
</style>
<div id="container">
<div id="target"></div>
</div>
<script>
test(() => {
assert_equals(getComputedStyle(target).color, "rgb(255, 0, 0)");
}, "Initially, 1rem equals 16px, less than the container's width");

test(() => {
document.documentElement.style.fontSize = "30px";
assert_equals(getComputedStyle(target).color, "rgb(0, 128, 0)");
}, "Changing the :root font-size makes 1rem equal 30px, greater than the container's width");
</script>
36 changes: 36 additions & 0 deletions css/css-conditional/container-queries/style-query-registered-custom-em-change.html
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<!DOCTYPE html>
<title>CSS Container Queries Test: style() query with em unit for registered custom property.</title>
<link rel="help" href="https://drafts.csswg.org/css-conditional-5/#style-container">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="support/cq-testcommon.js"></script>
<style>
@property --length {
syntax: "<length>";
initial-value: 0px;
inherits: false;
}

#container {
font-size: 16px;
--length: 20px;
}

#target { color: red; }
@container style(--length: calc(1em + 10px)) {
#target { color: green; }
}
</style>
<div id="container">
<div id="target">Should be green</div>
</div>
<script>
test(() => {
assert_equals(getComputedStyle(target).color, "rgb(255, 0, 0)");
}, "Initially, 1em (16px) + 10px evaluates to 26px. Target does not match.");

test(() => {
container.style.fontSize = "10px";
assert_equals(getComputedStyle(target).color, "rgb(0, 128, 0)");
}, "Changing the container's font-size to 10px makes 1em (10px) + 10px evaluate to 20px. Target matches.");
</script>
40 changes: 40 additions & 0 deletions css/css-conditional/container-queries/style-query-with-container-name-custom-change.html
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<!DOCTYPE html>
<title>CSS Container Queries Test: named container style() query toggling.</title>
<link rel="help" href="https://drafts.csswg.org/css-conditional-5/#style-container"/>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="support/cq-testcommon.js"></script>
<style>
.outer {
container-name: my-named-container;
--length: 200px;
}

.inner {
background-color: red;
}

@container my-named-container (style(--length: 200px)) {
.inner {
background-color: green;
}
}
</style>

<div id="dut">
<div id="child" class="inner"></div>
</div>

<script>
test(() => {
assert_equals(getComputedStyle(child).backgroundColor, "rgb(255, 0, 0)");
}, "Initially container rule does not match.");
test(() => {
dut.classList.add("outer");
assert_equals(getComputedStyle(child).backgroundColor, "rgb(0, 128, 0)");
}, "Container rule matches and inner changes colour");
test(() => {
dut.classList.remove("outer");
assert_equals(getComputedStyle(child).backgroundColor, "rgb(255, 0, 0)");
}, "Container rule stops matching and inner changes colour back");
</script>
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