42 lines
1.2 KiB
HTML
42 lines
1.2 KiB
HTML
<!DOCTYPE html>
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<title>CSS Position Test: ::backdrop inherits from originating element - computed values</title>
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<link rel="help" href="https://drafts.csswg.org/css-position-4/#backdrop">
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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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dialog {
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--foo: bar;
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--bg: green;
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left: 100px;
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color-scheme: dark;
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}
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dialog::backdrop {
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background-color: var(--bg);
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left: inherit;
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}
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</style>
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<dialog></dialog>
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<script>
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let dialog = document.querySelector("dialog");
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setup(() => {
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dialog.showModal();
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});
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test(() => {
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let style = getComputedStyle(dialog, "::backdrop");
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assert_equals(style.getPropertyValue("--foo"), "bar");
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assert_equals(style.getPropertyValue("--bg"), "green");
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}, "Inherit custom property");
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test(() => {
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assert_equals(getComputedStyle(dialog, "::backdrop").backgroundColor, "rgb(0, 128, 0)");
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}, "Apply inherited custom property to background-color");
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test(() => {
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assert_equals(getComputedStyle(dialog, "::backdrop").colorScheme, "dark");
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}, "Implicitly inherited color-scheme");
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test(() => {
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assert_equals(getComputedStyle(dialog, "::backdrop").left, "100px");
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}, "Explicitly inherited left");
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</script>
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