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<!DOCTYPE html>
<title>CSS Anchor Positioning Test: Dynamically change @position-try rules</title>
<link rel="help" href="https://drafts.csswg.org/css-anchor-1/#fallback-rule">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<style>
body { margin: 0; }
#anchor {
anchor-name: --a;
margin-left: 100px;
width: 100px;
height: 100px;
}
#anchored {
position: absolute;
width: 100px;
height: 100px;
position-try-options: --pf;
left: 999999px; /* force fallback */
}
</style>
<style id="to-enable" media="print">
@position-try --pf {
left: anchor(--a left);
}
</style>
<div>
<div id="anchor">anchor</div>
<div id="anchored">anchored</div>
</div>
<script>
test(() => {
assert_equals(anchored.offsetLeft, 999999);
}, "position-try-options initially not matching any rules");
test(() => {
document.getElementById("to-enable").media = "";
assert_equals(anchored.offsetLeft, 100);
}, "Enable @position-try rule stylesheet");
const sheet = document.getElementById("to-enable").sheet;
test(() => {
sheet.insertRule(
`@position-try --pf {
left: anchor(--a right);
}`, 1);
assert_equals(anchored.offsetLeft, 200);
}, "Insert overriding @position-try rule");
test(() => {
sheet.disabled = "true";
assert_equals(anchored.offsetLeft, 999999);
}, "Disable the @position-try rules");
</script>
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