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https://github.com/servo/servo.git
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92 lines
No EOL
3.4 KiB
HTML
92 lines
No EOL
3.4 KiB
HTML
<!doctype html>
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<title>round() function</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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</style>
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<meta name=author content="Tab Atkins-Bittner">
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<link rel=help href="https://drafts.csswg.org/css-values-4/#round-func">
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<div></div>
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<script>
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const testEl = document.querySelector("div");
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function testRound(testString, expectedString, {base="0px", msg}={}) {
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test(()=>{
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testEl.style.width = base;
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testEl.style.width = testString;
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const usedValue = getComputedStyle(testEl).width;
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assert_not_equals(usedValue, base);
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testEl.style.width = base;
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testEl.style.width = expectedString;
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const expectedValue = getComputedStyle(testEl).width;
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assert_not_equals(expectedValue, base)
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assert_equal(usedValue, expectedValue);
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}, msg || `${testString} should round to ${expectedString}`);
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}
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// No-op round should be same as nearest
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testRound("round(23px, 10px)", "20px");
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testRound("round(18px, 10px)", "20px");
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testRound("round(15px, 10px)", "20px");
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testRound("round(13px, 10px)", "10px");
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testRound("round(-13px, 10px)", "-10px");
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testRound("round(-18px, 10px)", "-20px");
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// Test nearest
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testRound("round(nearest, 23px, 10px)", "20px");
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testRound("round(nearest, 18px, 10px)", "20px");
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testRound("round(nearest, 15px, 10px)", "20px");
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testRound("round(nearest, 13px, 10px)", "10px");
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testRound("round(nearest, -13px, 10px)", "-10px");
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testRound("round(nearest, -18px, 10px)", "-20px");
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// Test down
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testRound("round(down, 23px, 10px)", "20px");
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testRound("round(down, 18px, 10px)", "10px");
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testRound("round(down, 15px, 10px)", "10px");
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testRound("round(down, 13px, 10px)", "10px");
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testRound("round(down, -13px, 10px)", "-20px");
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testRound("round(down, -18px, 10px)", "-20px");
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// Test up
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testRound("round(up, 23px, 10px)", "30px");
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testRound("round(up, 18px, 10px)", "20px");
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testRound("round(up, 15px, 10px)", "20px");
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testRound("round(up, 13px, 10px)", "20px");
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testRound("round(up, -13px, 10px)", "-10px");
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testRound("round(up, -18px, 10px)", "-10px");
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// Test to-zero
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testRound("round(to-zero, 23px, 10px)", "20px");
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testRound("round(to-zero, 18px, 10px)", "10px");
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testRound("round(to-zero, 15px, 10px)", "10px");
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testRound("round(to-zero, 13px, 10px)", "10px");
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testRound("round(to-zero, -13px, 10px)", "-10px");
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testRound("round(to-zero, -18px, 10px)", "-10px");
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// Test a negative step
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testRound("round(23px, -10px)", "20px");
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testRound("round(18px, -10px)", "20px");
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testRound("round(15px, -10px)", "20px");
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testRound("round(13px, -10px)", "10px");
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testRound("round(-13px, -10px)", "-10px");
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testRound("round(-18px, -10px)", "-20px");
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// Extreme cases:
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// 0 step is NaN
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testRound("round(5px, 0px)", "calc(NaN)");
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// both infinite is NaN
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testRound("round(1px/0, 1px/0)", "calc(NaN)");
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// infinite value with finite step is the same infinity
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testRound("round(1px/0, 5px)", "calc(infinity * 1px)");
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testRound("round(1px/0, -5px)", "calc(infinity * 1px)");
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testRound("round(-1px/0, 5px)", "calc(-infinity * 1px)");
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testRound("round(-1px/0, -5px)", "calc(-infinity * 1px)");
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// finite value with infinite step is same-sign 0
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testRound("calc(1/round(5px, 1px/0))", "calc(infinity * 1px)");
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testRound("calc(1/round(5px, -1px/0))", "calc(infinity * 1px)");
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testRound("calc(1/round(-5px, 1px/0))", "calc(-infinity * 1px)");
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testRound("calc(1/round(-5px, -1px/0))", "calc(-infinity * 1px)");
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</script> |