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If `will-change` is set to a property value where that property could create a stacking context, then we create a stacking context regardless of the current value of that property.
30 lines
958 B
HTML
30 lines
958 B
HTML
<!DOCTYPE html>
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<title>CSS Test: `will-change: z-index`</title>
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<link rel="author" title="Oriol Brufau" href="obrufau@igalia.com">
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<link rel="help" href="https://www.w3.org/TR/css-will-change/#valdef-will-change-custom-ident">
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<link rel="help" href="https://www.w3.org/TR/css-flexbox-1/#painting">
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<link rel="help" href="https://github.com/w3c/csswg-drafts/issues/11827">
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<link rel="match" href="../../../../expected/wpt-import/css/css-will-change/../reference/ref-filled-green-100px-square.xht">
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<meta name="assert" content="
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`will-change: z-index` establishes a stacking context on a flex item.
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">
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<style>
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.test {
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will-change: z-index;
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width: 100px;
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background: red;
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}
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.test::before {
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content: "";
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display: block;
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position: relative;
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z-index: -1;
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height: 100px;
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background: green;
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}
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</style>
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<p>Test passes if there is a filled green square and <strong>no red</strong>.</p>
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<div style="display: flex">
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<div class="test"></div>
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</div>
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