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<!doctype html>
<meta charset="utf-8">
<title>Container Queries - Style Change Event for transitions</title>
<link rel="help" href="https://drafts.csswg.org/css-transitions/#starting">
<link rel="help" href="https://drafts.csswg.org/css-contain-3/#animated-containers">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="support/cq-testcommon.js"></script>
<style>
.container {
container-type: inline-size;
}
#outer {
width: 100px;
color: green;
}
#target {
transition: color 100s step-end;
}
@container (min-width: 200px) {
#inner { color: red; }
}
@container (min-width: 200px) {
#target {
/* This rule exists just to have a container query dependency between
target and #inner */
background-color: orange;
}
}
</style>
<div id="outer" class="container">
<div id="inner" class="container">
<div id="target">Green</div>
</div>
</div>
<script>
setup(() => assert_implements_container_queries());
test(() => {
outer.offsetTop;
outer.style.width = "200px";
assert_equals(getComputedStyle(target).color, "rgb(0, 128, 0)");
}, "#inner color change to red triggers a step transition starting at green");
</script>
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