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<!DOCTYPE html>
<title>Tests parsing of @fallback-position rule</title>
<link rel="help" href="https://drafts.csswg.org/css-anchor-1/#fallback-rule">
<link rel="author" href="mailto:xiaochengh@chromium.org">
<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-fallback --foo {\n}');
test_valid_rule(`@position-fallback --foo {
@try { }
}`);
// @position-fallback needs exactly one <dashed-ident> as its name
test_invalid_rule('@position-fallback {\n}');
test_invalid_rule('@position-fallback foo {\n}');
test_invalid_rule('@position-fallback --foo --bar {\n}');
test_invalid_rule('@position-fallback --foo, --bar {\n}');
// @position-fallback accepts only @try blocks as its child rules. Other
// contents should be ignored.
test_valid_rule('@position-fallback --foo { top: 1px; }',
'@position-fallback --foo {\n}');
test_valid_rule('@position-fallback --foo { --bar: 1px; }',
'@position-fallback --foo {\n}');
test_valid_rule('@position-fallback --foo { @keyframes bar {} }',
'@position-fallback --foo {\n}');
test_valid_rule('@position-fallback --foo { @font-face {} }',
'@position-fallback --foo {\n}');
test_valid_rule('@position-fallback --foo { arbitrary garbage }',
'@position-fallback --foo {\n}');
// @try accepts only regular style declarations. Other contents should be
// ignored.
test_valid_rule('@position-fallback --foo { @try { @keyframes bar { } } }',
'@position-fallback --foo {\n @try { }\n}');
test_valid_rule('@position-fallback --foo { @try { @font-face { } } }',
'@position-fallback --foo {\n @try { }\n}');
</script>
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