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Test Info:

<!DOCTYPE html>
<title>CSS Container Queries Test: size container writing-mode change</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="support/cq-testcommon.js"></script>
<style>
#container {
container-type: size;
width: 500px;
height: 300px;
}
#target {
@container (inline-size = 300px) {
color: green;
}
@container (inline-size = 500px) {
color: red;
}
}
</style>
<div id="container">
<div id="target">Should be green</div>
</div>
<script>
setup(() => assert_implements_size_container_queries());
test(() => {
assert_equals(getComputedStyle(target).color, "rgb(255, 0, 0)");
}, "Initial horizontal writing-mode");
test(() => {
container.style.writingMode = "vertical-lr";
assert_equals(getComputedStyle(target).color, "rgb(0, 128, 0)");
}, "Vertical writing-mode changes logical query evaluation");
</script>