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chromium/third_party/blink/web_tests/external/wpt/css/css-pseudo/parsing/tree-abiding-pseudo-elements.html 

<!DOCTYPE html>
<meta charset="utf-8">
<title>CSS Pseudo-Elements Test: Parsing tree-abiding pseudo-elements</title>
<link rel="help" href="https://drafts.csswg.org/css-pseudo-4/#treelike">
<link rel="author" title="Oriol Brufau" href="mailto:[email protected]">
<meta name="assert" content="This test checks the validity of various selectors containing tree-abiding pseudo-elements." />
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/css/support/parsing-testcommon.js"></script>
<script>
// Generated content pseudo-elements
test_valid_selector("::before");
test_valid_selector("*::before", "::before");
test_valid_selector("foo.bar[baz]::before");
test_invalid_selector("::before *");

test_valid_selector("::after");
test_valid_selector("*::after", "::after");
test_valid_selector("foo.bar[baz]::after");
test_invalid_selector("::after *");

// List marker pseudo-element
test_valid_selector("::marker");
test_valid_selector("*::marker", "::marker");
test_valid_selector("foo.bar[baz]::marker");
test_invalid_selector("::marker *");

// Placeholder input pseudo-element
test_valid_selector("::placeholder");
test_valid_selector("*::placeholder", "::placeholder");
test_valid_selector("foo.bar[baz]::placeholder");
test_invalid_selector("::placeholder *");

// ::file-selector-button
test_valid_selector("::file-selector-button");
test_valid_selector("::file-selector-button:hover");
test_valid_selector("::file-selector-button:focus");
test_valid_selector("::file-selector-button:active");
test_valid_selector("::file-selector-button:is(:hover)");

test_invalid_selector("::file-selector-button::before");
test_invalid_selector("::file-selector-button#id");
test_invalid_selector("::file-selector-button#class");
test_invalid_selector("::file-selector-button:host");

// Combinations of the above
test_invalid_selector("::before::before");
test_invalid_selector("::after::before");
test_invalid_selector("::marker::before");
test_invalid_selector("::placeholder::before");

test_invalid_selector("::before::after");
test_invalid_selector("::after::after");
test_invalid_selector("::marker::after");
test_invalid_selector("::placeholder::after");

test_valid_selector("::before::marker");
test_valid_selector("::after::marker");
test_invalid_selector("::marker::marker");
test_invalid_selector("::placeholder::marker");

test_invalid_selector("::before::placeholder");
test_invalid_selector("::after::placeholder");
test_invalid_selector("::marker::placeholder");
test_invalid_selector("::placeholder::placeholder");
</script>