45 lines
1.2 KiB
HTML
45 lines
1.2 KiB
HTML
<!DOCTYPE html>
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<title>CSS Anchor Positioning Test: Dynamically change @position-try rules in Shadow DOM</title>
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<link rel="help" href="https://drafts.csswg.org/css-anchor-1/#fallback-rule">
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<script src="/resources/testharness.js"></script>
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<script src="/resources/testharnessreport.js"></script>
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<style>
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body { margin: 0; }
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#host { width: 200px }
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</style>
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<div id="host">
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<template shadowrootmode="open">
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<style>
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::slotted(#slotted), :host {
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position-try-fallbacks: --pf;
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position: absolute;
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left: 999999px; /* force fallback */
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}
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</style>
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<slot></slot>
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</template>
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<div id="slotted"></div>
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</div>
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<script>
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test(() => {
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assert_equals(host.offsetLeft, 999999);
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}, "#host is initially left: 999999px");
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test(() => {
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assert_equals(slotted.offsetLeft, 999999);
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}, "#slotted is initially left: 999999px");
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host.shadowRoot.styleSheets[0].insertRule(`
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@position-try --pf { left: 100px; }
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`);
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test(() => {
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assert_equals(host.offsetLeft, 100);
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}, "#host with inserted @position-try applied");
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test(() => {
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assert_equals(slotted.offsetLeft, 100);
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}, "#slotted with inserted @position-try applied");
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</script>
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