File: outline-width-rounding.tentative.html

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<!DOCTYPE html>
<html>
<head>
  <title>
    CSS Outline: width rounding
  </title>

  <link rel="author" title="Traian Captan" href="mailto:tcaptan@chromium.org">
  <link rel="help" href="https://www.w3.org/TR/css-ui-4/#outline-width">

  <meta name="assert" content="outline-width computed value after rounding.">

  <script src="/resources/testharness.js"></script>
  <script src="/resources/testharnessreport.js"></script>
</head>
<body>
  <h1>
    Test passes if outline widths are rounded up
    when they are greater than 0px and less than 1px,
    and rounded down when they are greater than 1px.
  </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: "2.99px", expected: "2px" },
      { input: "3px", expected: "3px" },
    ];

    for (const value of values) {
      const div = document.createElement("div");
      div.style = `outline: solid ${value.input} green; margin-bottom: 20px;`;
      document.body.appendChild(div);
    }

    var targets = document.querySelectorAll("div");

    for (var i=0; i < targets.length; ++i) {
      test(() => {
        assert_equals(getComputedStyle(targets[i]).outlineWidth, values[i].expected);
      }, values[i].input);
    }
    </script>
</body>
</html>