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Test Info: Warnings
- This test has a WPT meta file that expects 1 subtest issues.
- This WPT test may be referenced by the following Test IDs:
- /css/css-anchor-position/container-queries/anchored-fallback-display-change.html - WPT Dashboard Interop Dashboard
<!DOCTYPE html>
<title>CSS Conditional Test: @container anchored(fallback) changes display type</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/css/css-conditional/container-queries/support/cq-testcommon.js"></script>
<style>
body { margin: 0; }
#anchor {
anchor-name: --a;
margin-top: 100px;
width: 100px;
height: 100px;
}
#anchored {
position: absolute;
position-anchor: --a;
position-area: top;
position-try-fallbacks: flip-block;
width: 100px;
height: 100px;
container-type: anchored;
}
#t1 { height: 100%; }
@container anchored(fallback: none) {
#t1 { display: none; }
}
@container anchored(fallback: flip-block) {
#t1 { display: block; }
}
</style>
<div id="anchor"></div>
<div id="anchored">
<span id="t1"></span>
</div>
<script>
test(() => {
assert_equals(anchored.offsetTop, 0, "Non-fallback rendering");
assert_equals(t1.offsetHeight, 0, "display:none - zero offsetHeight");
}, "@container anchored() without applied fallback");
test(() => {
anchor.style.marginTop = "50px"; // Trigger fallback
assert_equals(anchored.offsetTop, 150, "Anchored element rendered below anchor");
assert_equals(t1.offsetHeight, 100, "Fallback applies display:block");
}, "@container anchored() with fallback applied");
</script>