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<!DOCTYPE html>
<title>CSS Anchor Positioning Test: Dynamically change @position-fallback rules in Shadow DOM</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; }
</style>
<div id="host">
<template shadowrootmode="open">
<style>
::slotted(#slotted), :host {
position-fallback: --pf;
position: absolute;
}
</style>
<slot></slot>
</template>
<div id="slotted"></div>
</div>
<script>
test(() => {
assert_equals(host.offsetLeft, 0);
}, "#host is initially left:auto");
test(() => {
assert_equals(slotted.offsetLeft, 0);
}, "#slotted is initially left:auto");
host.shadowRoot.styleSheets[0].insertRule(`
@position-fallback --pf {
@try { left: 100px; }
}
`);
test(() => {
assert_equals(host.offsetLeft, 100);
}, "#host with inserted @position-fallback applied");
test(() => {
assert_equals(slotted.offsetLeft, 100);
}, "#slotted with inserted @position-fallback applied");
</script>
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