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

<!DOCTYPE html>
<title>CSS Anchor Positioning Test: parsing of @position-try rules</title>
<link rel="help" href="https://drafts.csswg.org/css-anchor-1/#fallback-rule">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/css/support/parsing-testcommon.js"></script>
<script>
test_valid_rule('@position-try --foo { }');
test_valid_rule(`@position-try --foo { top: 1px; }`);

// @position-try needs exactly one <dashed-ident> as its name
test_invalid_rule('@position-try { }');
test_invalid_rule('@position-try foo { }');
test_invalid_rule('@position-try --foo --bar { }');
test_invalid_rule('@position-try --foo, --bar { }');

// @position-try only accepts a limited set of properties.
test_valid_rule('@position-try --foo { backround-color: green; }',
                '@position-try --foo { }');

// @position-try accepts only regular style declarations. Other
// contents should be ignored.
test_valid_rule('@position-try --foo { @keyframes bar {} }',
                '@position-try --foo { }');
test_valid_rule('@position-try --foo { @font-face {} }',
                '@position-try --foo { }');
test_valid_rule('@position-try --foo { @media print {} }',
                '@position-try --foo { }');
test_valid_rule('@position-try --foo { & {} }',
                '@position-try --foo { }');
test_valid_rule('@position-try --foo { arbitrary garbage }',
                '@position-try --foo { }');

</script>