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<!DOCTYPE html>
<title>Tests that finding a default anchor triggers the new scrollable containing-block.</title>
<link rel="help" href="https://drafts.csswg.org/css-anchor-position-1/">
<link rel="help" href="https://drafts.csswg.org/css-position-4/#scrollable-containing-block">
<link rel="help" href="https://github.com/w3c/csswg-drafts/issues/12552">
<style>
.scroller {
/* Use overflow hidden instead of scroll to mitigate scrollbar differences. */
overflow: hidden;
position: relative;
width: 80px;
height: 80px;
margin: 10px;
border: solid 3px;
padding: 10px;
}
.filler {
min-width: 180px;
min-height: 180px;
}
.anchor {
anchor-name: --a;
}
.target {
position: absolute;
inset: 0;
place-self: stretch;
}
</style>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/resources/check-layout-th.js"></script>
<body onload="checkLayout('.target')">
<!-- No default anchor should use the regular containing-block. -->
<div class="scroller">
<div class="filler"><div class="anchor"></div></div>
<div class="target" data-expected-width="100" data-expected-height="100"></div>
</div>
<!-- A default anchor - should use the scrollable containing-block. -->
<div class="scroller">
<div class="filler"><div class="anchor"></div></div>
<div class="target" style="position-anchor: --a;" data-expected-width="200" data-expected-height="200"></div>
</div>
<!-- A non-valid default anchor - should use the regular containing-block. -->
<div class="scroller">
<div class="filler"><div class="anchor"></div></div>
<div class="target" style="position-anchor: --b;" data-expected-width="100" data-expected-height="100"></div>
</div>
<!-- Only specifying position-area - should use the regular containing-block. -->
<div class="scroller">
<div class="filler"><div class="anchor"></div></div>
<div class="target" style="position-area: top;" data-expected-width="100" data-expected-height="100"></div>
</div>
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