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<!DOCTYPE html>
<title>CSS Transitions Test: trigger transitions on inherited after-change styles for anchored element using fallback</title>
<link rel="help" href="https://drafts.csswg.org/css-transitions-1/#after-change-style">
<link rel="help" href="https://drafts.csswg.org/css-anchor-position/">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<style>
body { margin: 0; }
#outer, #inner {
transition: 2s steps(2, start);
transition-property: color, width;
}
#outer {
anchor-name: --anchor;
width: 100px;
height: 100px;
background-color: orange;
}
#inner.wide {
width: 300px !important;
}
#inner {
width: 100px;
height: 100px;
position: absolute;
position-anchor: --anchor;
position-area: left center;
position-try-fallbacks: --fallback;
background-color: teal;
}
@position-try --fallback {
position-area: right center;
width: 200px;
}
#outer { color: red; }
#inner { color: black; }
#outer.green { color: lime; }
#outer.green #inner { color: unset; }
</style>
<div id="outer">
<div>
<div id="inner" class="wide"></div>
</div>
</div>
<script>
test(() => {
outer.offsetTop;
assert_equals(inner.offsetLeft, 100, "Initially using fallback position");
assert_equals(inner.offsetWidth, 300, "Initially using important #inner.wide");
assert_equals(getComputedStyle(inner).color, "rgb(0, 0, 0)", "#inner initially black");
outer.className = "green";
inner.className = "";
assert_equals(inner.offsetLeft, 100, "Still using fallback position");
assert_equals(inner.offsetWidth, 250, "Transitioning from !important width to fallback width");
assert_equals(getComputedStyle(inner).color, "rgb(0, 128, 0)", "#inner halfway between black and lime");
}, "Position fallback correctly applied to after-change style");
</script>
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