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revert-in-fallback.html
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<!DOCTYPE html>
<title>CSS Custom Properties: Using revert in fallbacks</title>
<linkrel="help" href="https://drafts.csswg.org/css-variables/#substitute-a-var">
<scriptsrc="/resources/testharness.js"></script>
<scriptsrc="/resources/testharnessreport.js"></script>
<style>
body.revert {
--x:FAIL;
margin:-1px;
display: grid;
--x:var(--unknown, revert);
margin:var(--unknown, revert);
display:var(--unknown, revert);
}
</style>
<html>
<body>
<preid=out></pre>
<script>
letbody_ua_display=getComputedStyle(document.body).display;
letbody_ua_margin=getComputedStyle(document.body).margin;
document.body.classList.add('revert');
test((t)=>{
assert_equals(getComputedStyle(document.body).getPropertyValue('--x'),'');
},'var(--unknown, revert) in custom property');
test((t)=>{
assert_equals(getComputedStyle(document.body).getPropertyValue('margin'),body_ua_margin);
},'var(--unknown, revert) in shorthand');
test((x)=>{
assert_equals(getComputedStyle(document.body).getPropertyValue('margin-left'),body_ua_margin);
},'var(--unknown, revert) in shorthand observed via longhand');
test((t)=>{
assert_equals(getComputedStyle(document.body).getPropertyValue('display'),body_ua_display);
},'var(--unknown, revert) in longhand');
</script>
</body>
</html>
