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<!doctype html>
<html class=reftest-wait>
<meta charset="utf-8">
<title>CSS Anchor Positioning Test: @position-try with different default anchors,
switching to fixed-position anchor on scroll and back on another scroll</title>
<link rel="help" href="https://drafts.csswg.org/css-anchor-position-1/#fallback-rule">
<link rel="match" href="position-try-switch-from-fixed-anchor-ref.html">
<script src="/common/reftest-wait.js"></script>
<script src="/common/rendering-utils.js"></script>
<style>
body {
width: 150vw;
height: 150vh;
}
.anchor {
width: 50px;
height: 50px;
background: orange;
}
#anchor1 {
anchor-name: --anchor1;
position: absolute;
top: 100px;
left: 350px;
}
#anchor2 {
anchor-name: --anchor2;
position:fixed;
right: 0;
bottom: 0;
}
#anchored {
position-anchor: --anchor1;
position-area: top;
position-try-fallbacks: --fixed;
position: fixed;
width: 50px;
height: 50px;
background: blue;
}
@position-try --fixed {
position-area: top left;
position-anchor: --anchor2;
}
</style>
<div class="anchor" id="anchor1"></div>
<div class="anchor" id="anchor2"></div>
<div id="anchored"></div>
<script>
waitForAtLeastOneFrame().then(() => {
window.scrollTo(250, 100);
// The initial option no longer fits. Switch to fallback.
waitForAtLeastOneFrame().then(() => {
window.scrollTo(0, 0);
// The initial option would fit again, but so does the fallback. Redisplay
// to move away from the fallback option.
anchored.style.display = "none";
waitForAtLeastOneFrame().then(() => {
anchored.style.display = "block";
takeScreenshot();
});
});
});
</script>
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