tor-browser

The Tor Browser
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variable-transitions-transition-property-all-before-value.html (2780B)

      1 <!DOCTYPE html>
      2 <html>
      3 <head>
      4    <title>CSS Variables - Transitions - Variable value specified before transition; 'all' keyword used</title>
      5 
      6    <meta rel="author" title="Kevin Babbitt">
      7    <meta rel="author" title="Greg Whitworth">
      8    <link rel="author" title="Microsoft Corporation" href="http://microsoft.com" />
      9    <link rel="help" href="http://www.w3.org/TR/css-variables-1/#syntax">
     10 
     11    <script src="/resources/testharness.js"></script>
     12    <script src="/resources/testharnessreport.js"></script>
     13 
     14    <style>
     15        #target
     16        {
     17            transition-property: all;
     18            transition-duration: 1s;
     19        }
     20        #target
     21        {
     22            --value: blue;
     23            color: var(--value);
     24        }
     25        #target.changed
     26        {
     27            --value: green;
     28        }
     29    </style>
     30 </head>
     31 <body>
     32 
     33    <div id="target">This text should transition from blue to green over a period of 1 second.</div>
     34 
     35 <script type="text/javascript">
     36    "use strict";
     37 
     38    // Force an initial layout pass
     39    document.documentElement.offsetHeight;
     40 
     41    test(function() {
     42        assert_equals(window.getComputedStyle(document.getElementById("target")).getPropertyValue("--value").trim(), "blue", "--value is blue before transition runs");
     43        }, "Verify CSS variable value before transition");
     44 
     45    test(function() {
     46        // Different browsers generate interpolated colors differently, so check multiple valid forms.
     47        assert_in_array(window.getComputedStyle(document.getElementById("target")).getPropertyValue("color").trim(),
     48            ["rgb(0, 0, 255)", "rgba(0, 0, 255, 1)"],
     49            "color is blue before transition runs");
     50        }, "Verify substituted color value before transition");
     51 
     52    var afterAnimationVariableTest = async_test("Verify CSS variable value after transition");
     53    document.getElementById("target").addEventListener("transitionend", afterAnimationVariableTest.step_func_done(function() {
     54        assert_equals(window.getComputedStyle(document.getElementById("target")).getPropertyValue("--value").trim(), "green", "--value is green after transition runs")
     55        }));
     56 
     57    var afterAnimationColorTest = async_test("Verify substituted color value after transition");
     58    document.getElementById("target").addEventListener("transitionend", afterAnimationColorTest.step_func_done(function() {
     59        assert_in_array(window.getComputedStyle(document.getElementById("target")).getPropertyValue("color").trim(),
     60            ["rgb(0, 128, 0)", "rgba(0, 128, 0, 1)"],
     61            "color is green after transition runs")
     62        }));
     63 
     64    // Trigger transition
     65    document.getElementById("target").className = "changed";
     66 
     67    // Force another layout pass
     68    document.documentElement.offsetHeight;
     69 </script>
     70 
     71 </body>
     72 </html>