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<!DOCTYPE html>
<title>The revert-rule keyword: basic behavior</title>
<link rel="help" href="https://github.com/w3c/csswg-drafts/issues/10443">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<style>
#test1 {
color: green;
}
#test1 {
color: red;
color: revert-rule;
}
</style>
<div id=test1></div>
<script>
test(() => {
assert_true(CSS.supports('color:revert-rule'));
assert_equals(getComputedStyle(test1).color, 'rgb(0, 128, 0)')
}, 'The revert-rule keyword rolls back to the previous rule');
</script>
<style>
#test2 { /* Specificity: (0, 0, 1) */
color: red;
}
#test2#test2#test2 { /* Specificity: (0, 0, 3) */
color: red;
color: revert-rule;
}
#test2#test2 { /* Specificity: (0, 0, 2) */
color: green;
}
</style>
<div id=test2></div>
<script>
test(() => {
assert_true(CSS.supports('color:revert-rule'));
assert_equals(getComputedStyle(test2).color, 'rgb(0, 128, 0)')
}, 'Cascade order determines the previous rule, not order of appearance');
</script>
<style>
#test3 {
color: red;
}
#test3 {
color: green;
}
</style>
<div id=test3 style="color:red; color:revert-rule"></div>
<script>
test(() => {
assert_true(CSS.supports('color:revert-rule'));
assert_equals(getComputedStyle(test3).color, 'rgb(0, 128, 0)')
}, 'Reverting from style attribute reverts to regular rules');
</script>
<style>
#test4 { z-index: 1; }
#test4 { z-index: 2; }
#test4 { z-index: -1; z-index: revert-rule; }
#test4 { z-index: -1; z-index: revert-rule; }
#test4 { z-index: -1; z-index: revert-rule; }
</style>
<div id=test4></div>
<script>
test(() => {
assert_true(CSS.supports('z-index:revert-rule'));
assert_equals(getComputedStyle(test4).zIndex, '2')
}, 'A chain of revert-rule works');
</script>
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