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<!DOCTYPE html>
<html>
<head>
<title>
CSS Border: width rounding
</title>
<link rel="author" title="Traian Captan" href="mailto:tcaptan@chromium.org">
<link rel="help" href="https://www.w3.org/TR/css-backgrounds-3/#border-width">
<meta name="assert" content="border-width computed value after rounding.">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
</head>
<body>
<h1>
Test passes if border widths are rounded up
when they are greater than 0 and less than 1,
and rounded down when they are greater than 1.
</h1>
<script>
const values = [
{ input: "0px", expected: "0px" },
{ input: "0.1px", expected: "1px" },
{ input: "0.25px", expected: "1px" },
{ input: "0.5px", expected: "1px" },
{ input: "0.9px", expected: "1px" },
{ input: "1px", expected: "1px" },
{ input: "1.25px", expected: "1px" },
{ input: "1.5px", expected: "1px" },
{ input: "2px", expected: "2px" },
{ input: "2.75px", expected: "2px" },
{ input: "2.999px", expected: "2px" },
];
for (const value of values) {
const div = document.createElement("div");
div.style = `border: solid ${value.input} blue; margin-bottom: 20px;`;
document.body.appendChild(div);
}
test(function() {
var targets = document.querySelectorAll("div");
for (var i=0; i < targets.length; ++i) {
assert_equals(getComputedStyle(targets[i]).borderWidth, values[i].expected);
}
}, "Test that border widths are rounded up when they are greater than 0px but less than 1px, and rounded down when they are greater than 1px.");
</script>
</body>
</html>
|
