56 lines
1.4 KiB
HTML
56 lines
1.4 KiB
HTML
<!DOCTYPE html>
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<title>@position-try for ::before and ::after pseudo elements</title>
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<link rel="help" href="https://drafts.csswg.org/css-anchor-position-1/#fallback">
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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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#container {
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background: maroon;
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position: relative;
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width: 195px;
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height: 200px;
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left: 999999px; /* force fallback */
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}
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#target::before {
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position-try-fallbacks: --f1, --f2;
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background: lime;
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position: absolute;
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left: 200px;
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top: 200px;
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width: 100px;
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height: 200px;
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content: "";
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}
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#target::after {
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position-try-fallbacks: --f1, --f2;
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background: green;
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position: absolute;
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left: 100px;
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width: 100px;
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height: 100px;
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content: "";
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}
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@position-try --f1 {
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top: 100px;
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left: 50px;
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}
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@position-try --f2 {
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top: 0px;
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left: 0px;
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}
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</style>
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<div id="container">
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<div id="target"></div>
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</div>
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<script>
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test(() => {
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const before_style = getComputedStyle(target, "::before");
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assert_equals(before_style.top, "0px");
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assert_equals(before_style.left, "0px");
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}, "::before using second fallback");
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test(() => {
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const after_style = getComputedStyle(target, "::after");
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assert_equals(after_style.top, "100px");
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assert_equals(after_style.left, "50px");
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}, "::after using first fallback");
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</script>
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