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