css/css-transitions/changing-while-transition.html

<!DOCTYPE html>
<html>
    <head>
        <meta charset="utf-8">
        <title>CSS Transitions Test: behavior when transition parameters change while transitioning</title>
        <meta name="assert" content="Test checks that all transitions run properly when property or duration is changed mid-run">
        <link rel="help" title="3. Starting of transitions" href="http://www.w3.org/TR/css3-transitions/#starting">
        <link rel="author" title="Rodney Rehm" href="http://rodneyrehm.de/en/">
        <meta name="flags" content="dom">

        <script src="/resources/testharness.js" type="text/javascript"></script>
        <script src="/resources/testharnessreport.js" type="text/javascript"></script>

        <script src="./support/vendorPrefix.js" type="text/javascript"></script>
        <script src="./support/helper.js" type="text/javascript"></script>
        <script src="./support/runParallelAsyncHarness.js" type="text/javascript"></script>
        <script src="./support/generalParallelTest.js" type="text/javascript"></script>

        <style type="text/css">
            #offscreen {
                position: absolute;
                top: -100000px;
                left: -100000px;
                width: 100000px;
                height: 100000px;
            }
        </style>

        <script id="metadata_cache">/*
        {
          "changing transition-duration / values": {},
          "changing transition-property / values": {}
        }
        */</script>
    </head>
    <body>
        <!-- required by testharnessreport.js -->
        <div id="log"></div>
        <!-- elements used for testing -->
        <div id="fixture" class="fixture">
            <div class="container">
                <div class="transition">Text sample</div>
            </div>
        </div>
        <div id="offscreen"></div>

        <!--
            SEE ./support/README.md for an abstract explanation of the test procedure
            http://test.csswg.org/source/contributors/rodneyrehm/submitted/css3-transitions/README.md
        -->

        <script>
            // this test takes its time, give it a minute to run
            var timeout = 60000;
            setup({timeout: timeout});

            var tests = [
                {
                    name: "changing transition-duration",
                    property: 'padding-left',
                    transitions: 'padding-left .5s linear 0s',
                    from: {'padding-left': '1px'},
                    to: {'padding-left': '10px'},
                    then: {
                        'transition-duration': '0.1s'
                    },
                    expect: [
                        'padding-left:0.5s'
                    ]
                },
                {
                    name: "changing transition-property",
                    property: 'padding-left',
                    transitions: 'padding-left .5s linear 0s',
                    from: {'padding-left': '1px'},
                    to: {'padding-left': '10px'},
                    then: {
                        'transition-property': 'margin-left'
                    },
                    expect: [
                        ''
                    ]
                }
            ];

            // general transition-duration
            var duration = '0.5s';

            runParallelAsyncHarness({
                // array of test data
                tests: tests,
                // the number of tests to run in parallel
                testsPerSlice: 50,
                // milliseconds to wait before calling teardown and ending test
                duration: parseFloat(duration) * 1000,
                // the global suite timeout
                timeout: timeout,
                // prepare individual test
                setup: function(data, options) {
                    var styles = {
                        '.fixture': {},

                        '.container': {},
                        '.container.to': {},
                        '.container.how': {},

                        '.transition': data.from,
                        '.transition.to' : data.to,
                        '.transition.how' : {transition: data.transitions},
                        '.transition.then' : data.then
                    };

                    generalParallelTest.setup(data, options);
                    generalParallelTest.addStyles(data, options, styles);
                },
                // cleanup after individual test
                teardown: generalParallelTest.teardown,
                // invoked prior to running a slice of tests
                sliceStart: generalParallelTest.sliceStart,
                // invoked after running a slice of tests
                sliceDone: generalParallelTest.sliceDone,
                // test cases, make them as granular as possible
                cases: {
                    // test property values while transitioning
                    // values.start kicks off a transition
                    'values': {
                        // run actual test, assertions can be used here!
                        start: function(test, data, options) {
                            // identify initial and target values
                            generalParallelTest.getStyle(data);
                            // kick off the transition
                            generalParallelTest.startTransition(data);

                            setTimeout(function() {
                                data.transition.node.classList.add('then');

                                for (var property in data.then) {
                                    var current = data.transition.computedStyle(property);
                                    assert_equals(current, data.then[property], 'value of ' + property + ' changed');
                                }

                            }, 50);
                        },
                        done: function(test, data, options) {
                            // make sure we got the event for the tested property only
                            test.step(generalParallelTest.assertExpectedEventsFunc(data, 'transition', data.expect));
                        }
                    }
                },
                // called once all tests are done
                done: generalParallelTest.done
            });
        </script>
    </body>
</html>