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chromium/third_party/blink/web_tests/external/wpt/css/css-anchor-position/anchor-parse-invalid.html 

<!DOCTYPE html>
<title>Tests values that are invalid at parse time for the anchor() function</title>
<link rel="help" href="https://drafts.csswg.org/css-anchor-1/#anchor-pos">
<link rel="author" href="mailto:[email protected]">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/css/support/parsing-testcommon.js"></script>

<script>
// anchor() can only be used in inset properties
test_invalid_value('margin-top', 'anchor(--foo top)');
test_invalid_value('height', 'anchor(--foo top)');
test_invalid_value('font-size', 'anchor(--foo top)');

// Invalid parameter format
test_invalid_value('top', 'anchor(--foo, top)');
test_invalid_value('top', 'anchor(--foo top,)');
test_invalid_value('top', 'anchor(--foo top bottom)');
test_invalid_value('top', 'anchor(--foo top, 10px 20%)');
test_invalid_value('top', 'anchor(--foo top, 10px, 20%)');

// Anchor name must be a dashed ident
test_invalid_value('top', 'anchor(foo top)');

// Invalid anchor side values
test_invalid_value('top', 'anchor(--foo height)');
test_invalid_value('top', 'anchor(--foo 10em)');
test_invalid_value('top', 'anchor(--foo 100s)');

// Invalid fallback values
test_invalid_value('top', 'anchor(--foo top, 1)');
test_invalid_value('top', 'anchor(--foo top, 100s)');
test_invalid_value('top', 'anchor(--foo top, bottom)');
test_invalid_value('top', 'anchor(--foo top, anchor(bar top))');
test_invalid_value('top', 'anchor(--foo top, anchor-size(--bar height))');

// Invalid anchor values in calc tree
test_invalid_value('top', 'calc(anchor(foo top) + 10px + 10%)');
test_invalid_value('top', 'calc(10px + 100 * anchor(--foo top, anchor(bar bottom)))');
test_invalid_value('top', 'min(anchor(--foo top), anchor(--bar bottom), anchor-size(--baz height))');
</script>