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<!doctype html>
<title>Container Queries - Scrollbars do not cause 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>
#scrollable {
overflow: auto;
width: 100px;
height: 100px;
}
#container {
container-type: inline-size;
}
#target {
background-color: black;
}
/* Matches with or without a scrollbar: */
@container (max-width: 100px) {
#target {
background-color: blue;
}
}
/* Matches only when there's a scrollbar: */
@container (max-width: 99px) {
#target {
background-color: green;
font-size: 10px;
transition: 2s steps(2, start) background-color;
}
}
</style>
<div id=scrollable>
<div id=container>
<div id=target>
Foo bar foo bar foo
Foo bar foo bar foo
Foo bar foo bar foo
Foo bar foo bar foo
Foo bar foo bar foo
</div>
</div>
</div>
<script>
setup(() => assert_implements_container_queries());
test(() => {
// Whether or not a scrollbar appeared is out of scope for this test.
// The only thing we care about is that no transition was triggered.
// Therefore we allow both 'green' and 'blue', but not any other values.
let has_scrollbar = target.offsetWidth < 100;
let expected = has_scrollbar ? 'rgb(0, 128, 0)' : 'rgb(0, 0, 255)';
assert_equals(getComputedStyle(target).backgroundColor, expected);
}, 'Scrollbars do not cause a transition of background-color');
</script>
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