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<!DOCTYPE html>
<title>CSS Custom Properties: Using revert-rule in fallbacks</title>
<link rel="help" href="https://drafts.csswg.org/css-variables/#substitute-a-var">
<link rel="help" href="https://drafts.csswg.org/css-cascade-5/#revert-rule-keyword">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<style>
#child {
--x:PASS;
margin: 1px;
padding-left: 1px;
}
#parent {
--x:FAIL;
margin: -1px;
padding-left: -1px;
}
#child {
--x: var(--unknown, revert-rule);
margin: var(--unknown, revert-rule);
padding-left: var(--unknown, revert-rule);
}
</style>
<div id=parent>
<div id=child>
</div>
</div>
<pre id=out>
</pre>
<script>
test((x) => {
assert_true(CSS.supports('--x:revert-rule'));
assert_equals(getComputedStyle(child).getPropertyValue('--x'), 'PASS');
}, 'var(--unknown, revert-rule) in custom property');
test((x) => {
assert_true(CSS.supports('margin:revert-rule'));
assert_equals(getComputedStyle(child).getPropertyValue('margin'), '1px');
}, 'var(--unknown, revert-rule) in shorthand');
test((x) => {
assert_true(CSS.supports('margin-left:revert-rule'));
assert_equals(getComputedStyle(child).getPropertyValue('margin-left'), '1px');
}, 'var(--unknown, revert-rule) in shorthand observed via longhand');
test((x) => {
assert_true(CSS.supports('padding-left:revert-rule'));
assert_equals(getComputedStyle(child).getPropertyValue('padding-left'), '1px');
}, 'var(--unknown, revert-rule) in longhand');
</script>
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