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<!DOCTYPE html>
<title>Tests that overflowing the inset-modified containing block triggers position fallback</title>
<link rel="help" href="https://drafts.csswg.org/css-anchor-1/#fallback">
<link rel="author" href="mailto:xiaochengh@chromium.org">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/resources/check-layout-th.js"></script>
<style>
.cb {
width: 400px;
height: 400px;
transform: scale(1);
background: yellow;
}
.anchor1 {
anchor-name: --a;
margin-left: 100px;
width: 100px;
height: 100px;
background: blue;
}
.target {
position: absolute;
position-fallback: --fallback;
width: min-content;
height: 100px;
background: orange;
}
.inline-spacer {
display: inline-block;
width: 200px;
height: 100px;
}
@position-fallback --fallback {
@try { /* 1: Position to the left of the anchor. */
left: 0;
right: anchor(--a left);
top: anchor(--a top);
}
@try { /* 2: Position to the right of the anchor. */
left: anchor(--a right);
right: 0;
top: anchor(--a top);
}
@try { /* 3: Placeholder fallback that shouldn't be selected when the previous
ones do not overflow the available space. */
inset: 0;
}
}
</style>
<body onload="checkLayout('.target')">
<!-- The first `@try` overflows the inset-modifed containing block -->
<div class="cb">
<div class="anchor1"></div>
<div class="target"
data-offset-x=200 data-offset-y=0
data-expected-width=200 data-expected-height=100>
<span class="inline-spacer"></span>
</div>
</div>
</body>
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