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https://github.com/web-platform-tests/wpt
26 December 2018, 22:31:15 UTC
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Tip revision: 491a02ce6f091db542aed561e3d984b0a18f4188 authored by fergald on 04 April 2018, 22:12:43 UTC
Handle the case when MANIFEST.json is empty
Tip revision: 491a02c
calc-unit-analysis.html 
<!DOCTYPE HTML>
<html>
<head>
  <title>CSS Variables Allowed Syntax</title>
  <link rel="author" title="L. David Baron" href="https://dbaron.org/">
  <link rel="author" title="Mozilla Corporation" href="http://mozilla.com/" />
  <link rel="help" href="http://www.w3.org/TR/css3-values/#lengths" />
  <link rel="help" href="http://www.w3.org/TR/css3-values/#calc-type-checking" />
  <script src="/resources/testharness.js"></script>
  <script src="/resources/testharnessreport.js"></script>
<style id="style"></style>
</head>
<body onload="run()">
<div id=log></div>
<div id="test"></div>
<script>

function run() {
  var test_elt = document.getElementById("test");
  var test_cs = window.getComputedStyle(test_elt, "");

  function description_to_name(description) {
    return description.replace(/\W+/g, "_").replace(/^_/, "").replace(/_$/, "");
  }

  function assert_invalid_value(property, value, description) {
    test(function() {
           test_elt.style.setProperty(property, "inherit");
           test_elt.style.setProperty(property, value);
           assert_equals(test_elt.style.getPropertyValue(property),
                         "inherit");
           test_elt.style.setProperty(property, value);
           test_elt.style.removeProperty(property);
         },
         description_to_name(description),
         { assert: "invalid calc expression: " + description });
  }

  function assert_valid_value(property, value, computes_to, description) {
    test(function() {
           test_elt.style.setProperty(property, "inherit");
           test_elt.style.setProperty(property, value);
           assert_not_equals(test_elt.style.getPropertyValue(property),
                             "inherit");
           assert_equals(test_cs.getPropertyValue(property),
                         computes_to);
           test_elt.style.removeProperty(property);
         },
         description_to_name(description),
         { assert: "valid calc expression: " + description });
  }

  assert_invalid_value("margin-left", "calc(0)",
                       "unitless zero in calc() is a numeric type, not length");
  assert_valid_value("margin-left", "calc(0px)", "0px",
                     "0px in calc()");
  assert_invalid_value("margin-left", "calc(1px + 2)",
                       "addition of length and number");
  assert_invalid_value("margin-left", "calc(2 + 1px)",
                       "addition of number and length");
  assert_invalid_value("margin-left", "calc(1px - 2)",
                       "subtraction of length and number");
  assert_invalid_value("margin-left", "calc(2 - 1px)",
                       "subtraction of number and length");
  assert_valid_value("margin-left", "calc(2px * 2)", "4px",
                     "multiplication of length and number");
  assert_valid_value("margin-left", "calc(2 * 2px)", "4px",
                     "multiplication of number and length");
  assert_invalid_value("margin-left", "calc(2px * 1px)",
                       "multiplication of length and length");

}

run();

</script>
</body>
</html>
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