<!DOCTYPE html>

  <meta charset="UTF-8">

  <title>CSS Values and Units Test: computed value of 'tab-size' and 'opacity' when specified with calc() function</title>

  <!--

  Original test is:

https://chromium.googlesource.com/chromium/src/+/c825d655f6aaf73484f9d56e9012793f5b9668cc/third_party/WebKit/LayoutTests/css3/calc/calc-numbers.html

  -->

  <link rel="author" title="Gérard Talbot" href="http://www.gtalbot.org/BrowserBugsSection/css21testsuite/">
  <link rel="help" href="https://www.w3.org/TR/css-color-3/#transparency">
  <link rel="help" href="https://www.w3.org/TR/css-text-3/#tab-size-property">
  <link rel="help" href="https://www.w3.org/TR/css3-values/#calc-computed-value">
  <link rel="help" href="https://www.w3.org/TR/css3-values/#calc-range">

  <meta name="flags" content="invalid">
  <meta content="This test verifies how 11 calc() functions are computed for 'opacity' and 'tab-size'." name="assert">

  <script src="/resources/testharness.js"></script>

  <script src="/resources/testharnessreport.js"></script>

  <div id="target"></div>

  <script>
  function startTesting()
  {

    function verifyComputedStyle(property_name, initial_value, specified_value, expected_value, description)
    {

    var elemTarget = document.getElementById("target");

    test(function()
      {

      elemTarget.style.setProperty(property_name, initial_value);

      /*
      In exactly 6 out of the 11 sub-tests, the initial_value will
      act as a fallback value because the specified value generates
      an invalid value. Since we are running 11 consecutive tests
      on the same element, then it is necessary to 'reset' its
      property to an initial value.
      */

      elemTarget.style.setProperty(property_name, specified_value);

      assert_equals(getComputedStyle(elemTarget)[property_name], expected_value, specified_value + ' should compute to ' + expected_value);

      }, description);
    }

 /* verifyComputedStyle(property_name, initial_value, specified_value, expected_value, description) */

    verifyComputedStyle("tab-size", "initial", "calc(2 * 3)", "6", "testing tab-size: calc(2 * 3)");

    verifyComputedStyle("tab-size", "12345", "calc(2 * -4)", "0", "testing tab-size: calc(2 * -4)");
    /*
    an out-of-range value inside a calc() does not cause
    the declaration to become invalid. The value resulting
    from an expression must be clamped to the range
    allowed in the target context.
    https://www.w3.org/TR/css-values-3/#calc-range
    */

    verifyComputedStyle("opacity", "initial", "calc(2 / 4)", "0.5", "testing opacity: calc(2 / 4)");

    verifyComputedStyle("tab-size", "12345", "calc(2 / 4)", "0.5", "testing tab-size: calc(2 / 4)");
    /*
    'tab-size' accepts <number> values.
    */

    verifyComputedStyle("opacity", "0.9", "calc(2 / 4) * 1px", "0.9", "testing opacity: calc(2 / 4) * 1px");

    verifyComputedStyle("tab-size", "12345", "calc(1 + 1px)", "12345", "testing tab-size: calc(1 + 1px)");

    verifyComputedStyle("tab-size", "12345", "calc(1 + 100%)", "12345", "testing tab-size: calc(1 + 100%)");

    verifyComputedStyle("tab-size", "12345", "calc(100%)", "12345", "testing tab-size: calc(100%)");

    verifyComputedStyle("tab-size", "12345", "calc(10px) bla", "12345", "testing tab-size: calc(10px) bla");

    verifyComputedStyle("tab-size", "12345", "calc(bla) 10px", "12345", "testing tab-size: calc(bla) 10px");

    verifyComputedStyle("tab-size", "initial", "calc(10px)", "10px", "testing tab-size: calc(10px)");

 /* verifyComputedStyle(property_name, initial_value, specified_value, expected_value, description) */
  }

  startTesting();

  </script>