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chromium/third_party/blink/web_tests/external/wpt/css/selectors/selectors-attr-white-space-001.html 

<!DOCTYPE html>
<meta charset="utf-8">
<title>Selectors: White space in attribute selectors</title>
<link rel="author" title="Cameron McCormack" href="mailto:[email protected]"/>
<link rel="help" href="https://drafts.csswg.org/selectors-3/#w3cselgrammar"/>
<link rel="help" href="https://drafts.csswg.org/selectors-4/#grammar"/>
<link rel="match" href="selectors-attr-white-space-001-ref.html"/>
<style>
body { color: red; }
[ data-test-1] { color: green; }
[data-test-2 ] { color: green; }
[data-test-3 = x] { color: green; }
[ |data-test-4] { color: green; }
[ | data-test-4] { color: red; }
</style>
<p data-test-1="">This text should be green.</p>
<p data-test-2="">This text should be green.</p>
<p data-test-3="x">This text should be green.</p>
<p data-test-4="">This text should be green.</p>