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Automatic update from web-platform-tests An+B Serialization Tests <https://github.com/w3c/csswg-drafts/issues/1504> -- Rename css/anb-serialization.html to css/css-syntax/anb-serialization.html -- Merge pull request #15059 from web-platform-tests/tabatkins-patch-1 An+B Serialization -- wpt-commits: 895a2771e79a635536be7bddbfe5f4db516c148f, fb10aa61eabc058334d03c29213783cca72131e9, 40934b05952574b2b5eeb98d4352f2994ef541dd wpt-pr: 15059
62 lines
1.4 KiB
HTML
62 lines
1.4 KiB
HTML
<!doctype html>
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<title>An+B Serialization</title>
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<script src="/resources/testharness.js"></script>
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<script src="/resources/testharnessreport.js"></script>
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<style>
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foo { color: blue; }
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</style>
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<meta name="author" title="Tab Atkins-Bittner">
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<link rel=help href="https://drafts.csswg.org/css-syntax/#serializing-anb">
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<script>
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function roundtripANB(str) {
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const rule = document.styleSheets[0].cssRules[0];
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rule.selectorText = "foo";
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rule.selectorText = `:nth-child(${str})`;
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// Check for parse error.
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if(rule.selectorText == "foo") return "parse error";
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return rule.selectorText.slice(11, -1);
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}
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function testANB(input, expected) {
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test(()=>{
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assert_equals(roundtripANB(input), expected);
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}, `"${input}" becomes "${expected}"`);
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}
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/* A is 0, or omitted */
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testANB("1", "1");
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testANB("+1", "1");
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testANB("-1", "-1");
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testANB("0n + 0", "0");
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testANB("0n + 1", "1");
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testANB("0n - 1", "-1");
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/* A is 1 */
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testANB("1n", "n");
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testANB("1n - 0", "n");
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testANB("1n + 1", "n+1");
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testANB("1n - 1", "n-1");
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/* A is -1 */
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testANB("-1n", "-n");
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testANB("-1n - 0", "-n");
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testANB("-1n + 1", "-n+1");
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testANB("-1n - 1", "-n-1");
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/* A is implied via + or - */
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testANB("+n+1", "n+1");
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testANB("-n-1", "-n-1");
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/* B is 0 */
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testANB("n + 0", "n");
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testANB("n - 0", "n");
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/* A & B both nonzero */
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testANB("2n + 2", "2n+2");
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testANB("-2n - 2", "-2n-2");
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</script>
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