From 26a029d407be480d791972afb5975cf62c9360a6 Mon Sep 17 00:00:00 2001
From: Daniel Baumann <daniel.baumann@progress-linux.org>
Date: Fri, 19 Apr 2024 02:47:55 +0200
Subject: Adding upstream version 124.0.1.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
---
 .../css/css-transitions/support/1x1-green.png      | Bin 0 -> 135 bytes
 .../tests/css/css-transitions/support/1x1-lime.png | Bin 0 -> 135 bytes
 .../css/css-transitions/support/1x1-maroon.png     | Bin 0 -> 109 bytes
 .../tests/css/css-transitions/support/1x1-navy.png | Bin 0 -> 109 bytes
 .../tests/css/css-transitions/support/1x1-red.png  | Bin 0 -> 135 bytes
 .../css/css-transitions/support/1x1-white.png      | Bin 0 -> 109 bytes
 .../css/css-transitions/support/60x60-gg-rr.png    | Bin 0 -> 224 bytes
 .../css/css-transitions/support/60x60-green.png    | Bin 0 -> 218 bytes
 .../tests/css/css-transitions/support/README       |  28 ++
 .../css-transitions/support/a-green-transition.css |   1 +
 .../tests/css/css-transitions/support/a-green.css  |   1 +
 .../tests/css/css-transitions/support/b-green.css  |   1 +
 .../tests/css/css-transitions/support/c-red.css    |   1 +
 .../tests/css/css-transitions/support/cat.png      | Bin 0 -> 1883 bytes
 .../css-transitions/support/generalParallelTest.js | 231 ++++++++++++
 .../tests/css/css-transitions/support/helper.js    | 326 ++++++++++++++++
 .../css/css-transitions/support/import-green.css   |   1 +
 .../css/css-transitions/support/import-red.css     |   1 +
 .../tests/css/css-transitions/support/one.gif      | Bin 0 -> 184 bytes
 .../support/pattern-grg-rgr-grg.png                | Bin 0 -> 222 bytes
 .../support/pattern-grg-rrg-rgg.png                | Bin 0 -> 231 bytes
 .../support/pattern-rgr-grg-rgr.png                | Bin 0 -> 223 bytes
 .../css/css-transitions/support/pattern-tr.png     | Bin 0 -> 137 bytes
 .../css/css-transitions/support/properties.js      | 410 +++++++++++++++++++++
 .../css/css-transitions/support/ruler-h-50%.png    | Bin 0 -> 691 bytes
 .../css/css-transitions/support/ruler-h-50px.png   | Bin 0 -> 671 bytes
 .../css/css-transitions/support/ruler-v-100px.png  | Bin 0 -> 760 bytes
 .../css/css-transitions/support/ruler-v-50px.png   | Bin 0 -> 757 bytes
 .../support/runParallelAsyncHarness.js             | 148 ++++++++
 .../css/css-transitions/support/square-purple.png  | Bin 0 -> 92 bytes
 .../css/css-transitions/support/square-teal.png    | Bin 0 -> 92 bytes
 .../css/css-transitions/support/square-white.png   | Bin 0 -> 78 bytes
 .../css/css-transitions/support/support/README     |   4 +
 .../support/support/swatch-green.png               | Bin 0 -> 84 bytes
 .../css-transitions/support/support/swatch-red.png | Bin 0 -> 84 bytes
 .../css/css-transitions/support/swatch-blue.png    | Bin 0 -> 84 bytes
 .../css/css-transitions/support/swatch-green.png   | Bin 0 -> 84 bytes
 .../css/css-transitions/support/swatch-lime.png    | Bin 0 -> 84 bytes
 .../css/css-transitions/support/swatch-orange.png  | Bin 0 -> 84 bytes
 .../css/css-transitions/support/swatch-red.png     | Bin 0 -> 84 bytes
 .../css/css-transitions/support/swatch-teal.png    | Bin 0 -> 156 bytes
 .../css/css-transitions/support/swatch-white.png   | Bin 0 -> 85 bytes
 .../css/css-transitions/support/swatch-yellow.png  | Bin 0 -> 84 bytes
 .../tests/css/css-transitions/support/test-bl.png  | Bin 0 -> 1368 bytes
 .../tests/css/css-transitions/support/test-br.png  | Bin 0 -> 1045 bytes
 .../support/test-inner-half-size.png               | Bin 0 -> 180 bytes
 .../css/css-transitions/support/test-outer.png     | Bin 0 -> 2412 bytes
 .../tests/css/css-transitions/support/test-tl.png  | Bin 0 -> 1025 bytes
 .../tests/css/css-transitions/support/test-tr.png  | Bin 0 -> 1235 bytes
 .../tests/css/css-transitions/support/two.gif      | Bin 0 -> 184 bytes
 .../css/css-transitions/support/vendorPrefix.js    |  86 +++++
 51 files changed, 1239 insertions(+)
 create mode 100644 testing/web-platform/tests/css/css-transitions/support/1x1-green.png
 create mode 100644 testing/web-platform/tests/css/css-transitions/support/1x1-lime.png
 create mode 100644 testing/web-platform/tests/css/css-transitions/support/1x1-maroon.png
 create mode 100644 testing/web-platform/tests/css/css-transitions/support/1x1-navy.png
 create mode 100644 testing/web-platform/tests/css/css-transitions/support/1x1-red.png
 create mode 100644 testing/web-platform/tests/css/css-transitions/support/1x1-white.png
 create mode 100644 testing/web-platform/tests/css/css-transitions/support/60x60-gg-rr.png
 create mode 100644 testing/web-platform/tests/css/css-transitions/support/60x60-green.png
 create mode 100644 testing/web-platform/tests/css/css-transitions/support/README
 create mode 100644 testing/web-platform/tests/css/css-transitions/support/a-green-transition.css
 create mode 100644 testing/web-platform/tests/css/css-transitions/support/a-green.css
 create mode 100644 testing/web-platform/tests/css/css-transitions/support/b-green.css
 create mode 100644 testing/web-platform/tests/css/css-transitions/support/c-red.css
 create mode 100644 testing/web-platform/tests/css/css-transitions/support/cat.png
 create mode 100644 testing/web-platform/tests/css/css-transitions/support/generalParallelTest.js
 create mode 100644 testing/web-platform/tests/css/css-transitions/support/helper.js
 create mode 100644 testing/web-platform/tests/css/css-transitions/support/import-green.css
 create mode 100644 testing/web-platform/tests/css/css-transitions/support/import-red.css
 create mode 100644 testing/web-platform/tests/css/css-transitions/support/one.gif
 create mode 100644 testing/web-platform/tests/css/css-transitions/support/pattern-grg-rgr-grg.png
 create mode 100644 testing/web-platform/tests/css/css-transitions/support/pattern-grg-rrg-rgg.png
 create mode 100644 testing/web-platform/tests/css/css-transitions/support/pattern-rgr-grg-rgr.png
 create mode 100644 testing/web-platform/tests/css/css-transitions/support/pattern-tr.png
 create mode 100644 testing/web-platform/tests/css/css-transitions/support/properties.js
 create mode 100644 testing/web-platform/tests/css/css-transitions/support/ruler-h-50%.png
 create mode 100644 testing/web-platform/tests/css/css-transitions/support/ruler-h-50px.png
 create mode 100644 testing/web-platform/tests/css/css-transitions/support/ruler-v-100px.png
 create mode 100644 testing/web-platform/tests/css/css-transitions/support/ruler-v-50px.png
 create mode 100644 testing/web-platform/tests/css/css-transitions/support/runParallelAsyncHarness.js
 create mode 100644 testing/web-platform/tests/css/css-transitions/support/square-purple.png
 create mode 100644 testing/web-platform/tests/css/css-transitions/support/square-teal.png
 create mode 100644 testing/web-platform/tests/css/css-transitions/support/square-white.png
 create mode 100644 testing/web-platform/tests/css/css-transitions/support/support/README
 create mode 100644 testing/web-platform/tests/css/css-transitions/support/support/swatch-green.png
 create mode 100644 testing/web-platform/tests/css/css-transitions/support/support/swatch-red.png
 create mode 100644 testing/web-platform/tests/css/css-transitions/support/swatch-blue.png
 create mode 100644 testing/web-platform/tests/css/css-transitions/support/swatch-green.png
 create mode 100644 testing/web-platform/tests/css/css-transitions/support/swatch-lime.png
 create mode 100644 testing/web-platform/tests/css/css-transitions/support/swatch-orange.png
 create mode 100644 testing/web-platform/tests/css/css-transitions/support/swatch-red.png
 create mode 100644 testing/web-platform/tests/css/css-transitions/support/swatch-teal.png
 create mode 100644 testing/web-platform/tests/css/css-transitions/support/swatch-white.png
 create mode 100644 testing/web-platform/tests/css/css-transitions/support/swatch-yellow.png
 create mode 100644 testing/web-platform/tests/css/css-transitions/support/test-bl.png
 create mode 100644 testing/web-platform/tests/css/css-transitions/support/test-br.png
 create mode 100644 testing/web-platform/tests/css/css-transitions/support/test-inner-half-size.png
 create mode 100644 testing/web-platform/tests/css/css-transitions/support/test-outer.png
 create mode 100644 testing/web-platform/tests/css/css-transitions/support/test-tl.png
 create mode 100644 testing/web-platform/tests/css/css-transitions/support/test-tr.png
 create mode 100644 testing/web-platform/tests/css/css-transitions/support/two.gif
 create mode 100644 testing/web-platform/tests/css/css-transitions/support/vendorPrefix.js

(limited to 'testing/web-platform/tests/css/css-transitions/support')

diff --git a/testing/web-platform/tests/css/css-transitions/support/1x1-green.png b/testing/web-platform/tests/css/css-transitions/support/1x1-green.png
new file mode 100644
index 0000000000..b98ca0ba0a
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diff --git a/testing/web-platform/tests/css/css-transitions/support/1x1-lime.png b/testing/web-platform/tests/css/css-transitions/support/1x1-lime.png
new file mode 100644
index 0000000000..cb397fb090
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diff --git a/testing/web-platform/tests/css/css-transitions/support/1x1-maroon.png b/testing/web-platform/tests/css/css-transitions/support/1x1-maroon.png
new file mode 100644
index 0000000000..3f86b07219
Binary files /dev/null and b/testing/web-platform/tests/css/css-transitions/support/1x1-maroon.png differ
diff --git a/testing/web-platform/tests/css/css-transitions/support/1x1-navy.png b/testing/web-platform/tests/css/css-transitions/support/1x1-navy.png
new file mode 100644
index 0000000000..9b9a03955b
Binary files /dev/null and b/testing/web-platform/tests/css/css-transitions/support/1x1-navy.png differ
diff --git a/testing/web-platform/tests/css/css-transitions/support/1x1-red.png b/testing/web-platform/tests/css/css-transitions/support/1x1-red.png
new file mode 100644
index 0000000000..6bd73ac101
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diff --git a/testing/web-platform/tests/css/css-transitions/support/1x1-white.png b/testing/web-platform/tests/css/css-transitions/support/1x1-white.png
new file mode 100644
index 0000000000..dd43faec54
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diff --git a/testing/web-platform/tests/css/css-transitions/support/60x60-gg-rr.png b/testing/web-platform/tests/css/css-transitions/support/60x60-gg-rr.png
new file mode 100644
index 0000000000..84f5b2a4f1
Binary files /dev/null and b/testing/web-platform/tests/css/css-transitions/support/60x60-gg-rr.png differ
diff --git a/testing/web-platform/tests/css/css-transitions/support/60x60-green.png b/testing/web-platform/tests/css/css-transitions/support/60x60-green.png
new file mode 100644
index 0000000000..b3c8cf3eb4
Binary files /dev/null and b/testing/web-platform/tests/css/css-transitions/support/60x60-green.png differ
diff --git a/testing/web-platform/tests/css/css-transitions/support/README b/testing/web-platform/tests/css/css-transitions/support/README
new file mode 100644
index 0000000000..2e5f2ad073
--- /dev/null
+++ b/testing/web-platform/tests/css/css-transitions/support/README
@@ -0,0 +1,28 @@
+CSS Global Support Directory
+============================
+
+This directory contains common support files (such as images and external
+style sheets). These are sync'ed into the support directories of all our
+test suites. If you have test-suite-specific support files, please add
+them to the appropriate test-suite-specific support/ directory.
+
+If you add to a support/ directory, please run the tools/supportprop.py
+script from the top of the repository to cascade support files into the
+lower-level support directories.
+
+Description of the Common Support File Collection
+-------------------------------------------------
+
+The 1x1-* images are all exactly one pixel.
+
+The swatch-* images all use 15x15 cells.
+
+The square-* images all use 15x15 cells with one pixel borders.
+
+The pattern-* images use cells of various sizes:
+
+   pattern-grg-rgr-grg.png   20x20
+   pattern-rgr-grg-rgr.png   20x20
+   pattern-tr.png            15x15
+   pattern-grg-rrg-rgg.png   15x15
+
diff --git a/testing/web-platform/tests/css/css-transitions/support/a-green-transition.css b/testing/web-platform/tests/css/css-transitions/support/a-green-transition.css
new file mode 100644
index 0000000000..3f68e53cd6
--- /dev/null
+++ b/testing/web-platform/tests/css/css-transitions/support/a-green-transition.css
@@ -0,0 +1 @@
+.a { color: green; transition: 10s; transition-timing-function: step-end; }
diff --git a/testing/web-platform/tests/css/css-transitions/support/a-green.css b/testing/web-platform/tests/css/css-transitions/support/a-green.css
new file mode 100644
index 0000000000..b0dbb071d5
--- /dev/null
+++ b/testing/web-platform/tests/css/css-transitions/support/a-green.css
@@ -0,0 +1 @@
+.a { color: green; }
diff --git a/testing/web-platform/tests/css/css-transitions/support/b-green.css b/testing/web-platform/tests/css/css-transitions/support/b-green.css
new file mode 100644
index 0000000000..a0473f5ca2
--- /dev/null
+++ b/testing/web-platform/tests/css/css-transitions/support/b-green.css
@@ -0,0 +1 @@
+.b { color: green; }
\ No newline at end of file
diff --git a/testing/web-platform/tests/css/css-transitions/support/c-red.css b/testing/web-platform/tests/css/css-transitions/support/c-red.css
new file mode 100644
index 0000000000..d4ba5c64e9
--- /dev/null
+++ b/testing/web-platform/tests/css/css-transitions/support/c-red.css
@@ -0,0 +1 @@
+.c { color: red; }
\ No newline at end of file
diff --git a/testing/web-platform/tests/css/css-transitions/support/cat.png b/testing/web-platform/tests/css/css-transitions/support/cat.png
new file mode 100644
index 0000000000..85dd732481
Binary files /dev/null and b/testing/web-platform/tests/css/css-transitions/support/cat.png differ
diff --git a/testing/web-platform/tests/css/css-transitions/support/generalParallelTest.js b/testing/web-platform/tests/css/css-transitions/support/generalParallelTest.js
new file mode 100644
index 0000000000..f6e14128fc
--- /dev/null
+++ b/testing/web-platform/tests/css/css-transitions/support/generalParallelTest.js
@@ -0,0 +1,231 @@
+(function(root) {
+'use strict';
+//
+var index = 0;
+var suite = root.generalParallelTest = {
+    // prepare individual test
+    setup: function(data, options) {
+        suite._setupDom(data, options);
+        suite._setupEvents(data, options);
+    },
+    // clone fixture and prepare data containers
+    _setupDom: function(data, options) {
+        // clone fixture into off-viewport test-canvas
+        data.fixture = document.getElementById('fixture').cloneNode(true);
+        data.fixture.id = 'test-' + (index++);
+        (document.getElementById('offscreen') || document.body).appendChild(data.fixture);
+
+        // data container for #fixture > .container > .transition
+        data.transition = {
+            node: data.fixture.querySelector('.transition'),
+            values: [],
+            events: [],
+            computedStyle: function(property) {
+                return computedStyle(data.transition.node, property);
+            }
+        };
+
+        // data container for #fixture > .container
+        data.container = {
+            node: data.transition.node.parentNode,
+            values: [],
+            events: [],
+            computedStyle: function(property) {
+                return computedStyle(data.container.node, property);
+            }
+        };
+
+        // data container for #fixture > .container > .transition[:before | :after]
+        if (data.pseudo) {
+            data.pseudo = {
+                name: data.pseudo,
+                values: [],
+                computedStyle: function(property) {
+                    return computedStyle(data.transition.node, property, ':' + data.pseudo.name);
+                }
+            };
+        }
+    },
+    // bind TransitionEnd event listeners
+    _setupEvents: function(data, options) {
+        ['transition', 'container'].forEach(function(elem) {
+            var handler = function(event) {
+                event.stopPropagation();
+                var name = event.propertyName;
+                var time = Math.round(event.elapsedTime * 1000) / 1000;
+                var pseudo = event.pseudoElement ? (':' + event.pseudoElement) : '';
+                data[elem].events.push(name + pseudo + ":" + time + "s");
+            };
+            data[elem].node.addEventListener('transitionend', handler, false);
+            data[elem]._events = {'transitionend': handler};
+        });
+    },
+    // cleanup after individual test
+    teardown: function(data, options) {
+        // data.fixture.remove();
+        if (data.fixture.parentNode) {
+            data.fixture.parentNode.removeChild(data.fixture);
+        }
+    },
+    // invoked prior to running a slice of tests
+    sliceStart: function(options, tests) {
+        // inject styles into document
+        setStyle(options.styles);
+        // kick off value collection loop
+        generalParallelTest.startValueCollection(options);
+    },
+    // invoked after running a slice of tests
+    sliceDone: function(options, tests) {
+        // stop value collection loop
+        generalParallelTest.stopValueCollection(options);
+        // reset styles cache
+        options.styles = {};
+    },
+    // called once all tests are done
+    done: function(options) {
+        // reset document styles
+        setStyle();
+        reflow();
+    },
+    // add styles of individual test to slice cache
+    addStyles: function(data, options, styles) {
+        if (!options.styles) {
+            options.styles = {};
+        }
+
+        Object.keys(styles).forEach(function(key) {
+            var selector = '#' + data.fixture.id
+                // fixture must become #fixture.fixture rather than a child selector
+                + (key.substring(0, 8) === '.fixture' ? '' : ' ')
+                + key;
+
+            options.styles[selector] = styles[key];
+        });
+    },
+    // set style and compute values for container and transition
+    getStyle: function(data) {
+        reflow();
+        // grab current styles: "initial state"
+        suite._getStyleFor(data, 'from');
+        // apply target state
+        suite._addClass(data, 'to', true);
+        // grab current styles: "target state"
+        suite._getStyleFor(data, 'to');
+        // remove target state
+        suite._removeClass(data, 'to', true);
+
+        // clean up the mess created for value collection
+        data.container._values = [];
+        data.transition._values = [];
+        if (data.pseudo) {
+            data.pseudo._values = [];
+        }
+    },
+    // grab current styles and store in respective element's data container
+    _getStyleFor: function(data, key) {
+        data.container[key] = data.container.computedStyle(data.property);
+        data.transition[key] = data.transition.computedStyle(data.property);
+        if (data.pseudo) {
+            data.pseudo[key] = data.pseudo.computedStyle(data.property);
+        }
+    },
+    // add class to test's elements and possibly reflow
+    _addClass: function(data, className, forceReflow) {
+        data.container.node.classList.add(className);
+        data.transition.node.classList.add(className);
+        if (forceReflow) {
+            reflow();
+        }
+    },
+    // remove class from test's elements and possibly reflow
+    _removeClass: function(data, className, forceReflow) {
+        data.container.node.classList.remove(className);
+        data.transition.node.classList.remove(className);
+        if (forceReflow) {
+            reflow();
+        }
+    },
+    // add transition and to classes to container and transition
+    startTransition: function(data) {
+        // add transition-defining class
+        suite._addClass(data, 'how', true);
+        // add target state (without reflowing)
+        suite._addClass(data, 'to', false);
+    },
+    // requestAnimationFrame runLoop to collect computed values
+    startValueCollection: function(options) {
+        var raf = window.requestAnimationFrame || function(callback){
+            setTimeout(callback, 20);
+        };
+
+        // flag denoting if the runLoop should continue (true) or exit (false)
+        options._collectValues = true;
+
+        function runLoop() {
+            if (!options._collectValues) {
+                // test's are done, stop annoying the CPU
+                return;
+            }
+
+            // collect current style for test's elements
+            options.tests.forEach(function(data) {
+                if (!data.property) {
+                    return;
+                }
+
+                ['transition', 'container', 'pseudo'].forEach(function(elem) {
+                    var pseudo = null;
+                    if (!data[elem] || (elem === 'pseudo' && !data.pseudo)) {
+                        return;
+                    }
+
+                    var current = data[elem].computedStyle(data.property);
+                    var values = data[elem].values;
+                    var length = values.length;
+                    if (!length || values[length - 1] !== current) {
+                        values.push(current);
+                    }
+                });
+            });
+
+            // rinse and repeat
+            raf(runLoop);
+        }
+
+        runLoop();
+    },
+    // stop requestAnimationFrame runLoop collecting computed values
+    stopValueCollection: function(options) {
+        options._collectValues = false;
+    },
+
+    // generate test.step function asserting collected events match expected
+    assertExpectedEventsFunc: function(data, elem, expected) {
+        return function() {
+            var _result = data[elem].events.sort().join(" ");
+            var _expected = typeof expected === 'string' ? expected : expected.sort().join(" ");
+            assert_equals(_result, _expected, "Expected TransitionEnd events triggered on ." + elem);
+        };
+    },
+    // generate test.step function asserting collected values are neither initial nor target
+    assertIntermediateValuesFunc: function(data, elem) {
+        return function() {
+            // the first value (index: 0) is always going to be the initial value
+            // the last value is always going to be the target value
+            var values = data[elem].values;
+            if (data.flags.discrete) {
+                // a discrete value will just switch from one state to another without having passed intermediate states.
+                assert_equals(values[0], data[elem].from, "must be initial value while transitioning on ." + elem);
+                assert_equals(values[1], data[elem].to, "must be target value after transitioning on ." + elem);
+                assert_equals(values.length, 2, "discrete property only has 2 values ." + elem);
+            } else {
+                assert_not_equals(values[1], data[elem].from, "may not be initial value while transitioning on ." + elem);
+                assert_not_equals(values[1], data[elem].to, "may not be target value while transitioning on ." + elem);
+            }
+
+            // TODO: first value must be initial, last value must be target
+        };
+    }
+};
+
+})(window);
diff --git a/testing/web-platform/tests/css/css-transitions/support/helper.js b/testing/web-platform/tests/css/css-transitions/support/helper.js
new file mode 100644
index 0000000000..a37aae9183
--- /dev/null
+++ b/testing/web-platform/tests/css/css-transitions/support/helper.js
@@ -0,0 +1,326 @@
+//
+// Simple Helper Functions For Testing CSS
+//
+
+(function(root) {
+'use strict';
+
+// serialize styles object and dump to dom
+// appends <style id="dynamic-style"> to <head>
+// setStyle("#some-selector", {"some-style" : "value"})
+// setStyle({"#some-selector": {"some-style" : "value"}})
+root.setStyle = function(selector, styles) {
+    var target = document.getElementById('dynamic-style');
+    if (!target) {
+        target = document.createElement('style');
+        target.id = 'dynamic-style';
+        target.type = "text/css";
+        document.getElementsByTagName('head')[0].appendChild(target);
+    }
+
+    var data = [];
+    // single selector/styles
+    if (typeof selector === 'string' && styles !== undefined) {
+        data = [selector, '{', serializeStyles(styles), '}'];
+        target.textContent = data.join("\n");
+        return;
+    }
+    // map of selector/styles
+    for (var key in selector) {
+        if (Object.prototype.hasOwnProperty.call(selector, key)) {
+            var _data = [key, '{', serializeStyles(selector[key]), '}'];
+            data.push(_data.join('\n'));
+        }
+    }
+
+    target.textContent = data.join("\n");
+};
+
+function serializeStyles(styles) {
+    var data = [];
+    for (var property in styles) {
+        if (Object.prototype.hasOwnProperty.call(styles, property)) {
+            var prefixedProperty = addVendorPrefix(property);
+            data.push(prefixedProperty + ":" + styles[property] + ";");
+        }
+    }
+
+    return data.join('\n');
+}
+
+
+// shorthand for computed style
+root.computedStyle = function(element, property, pseudo) {
+    var prefixedProperty = addVendorPrefix(property);
+    return window
+        .getComputedStyle(element, pseudo || null)
+        .getPropertyValue(prefixedProperty);
+};
+
+// flush rendering buffer
+root.reflow = function() {
+    document.body.offsetWidth;
+};
+
+// merge objects
+root.extend = function(target /*, ..rest */) {
+    Array.prototype.slice.call(arguments, 1).forEach(function(obj) {
+        Object.keys(obj).forEach(function(key) {
+            target[key] = obj[key];
+        });
+    });
+
+    return target;
+};
+
+// dom fixture helper ("resetting dom test elements")
+var _domFixture;
+var _domFixtureSelector;
+root.domFixture = function(selector) {
+    var fixture = document.querySelector(selector || _domFixtureSelector);
+    if (!fixture) {
+        throw new Error('fixture ' + (selector || _domFixtureSelector) + ' not found!');
+    }
+    if (!_domFixture && selector) {
+        // save a copy
+        _domFixture = fixture.cloneNode(true);
+        _domFixtureSelector = selector;
+    } else if (_domFixture) {
+        // restore the copy
+        var tmp = _domFixture.cloneNode(true);
+        fixture.parentNode.replaceChild(tmp, fixture);
+    } else {
+        throw new Error('domFixture must be initialized first!');
+    }
+};
+
+root.MS_PER_SEC = 1000;
+
+/*
+ * The recommended minimum precision to use for time values.
+ *
+ * Based on Web Animations:
+ * https://w3c.github.io/web-animations/#precision-of-time-values
+ */
+const TIME_PRECISION = 0.0005; // ms
+
+/*
+ * Allow implementations to substitute an alternative method for comparing
+ * times based on their precision requirements.
+ */
+root.assert_times_equal = function(actual, expected, description) {
+  assert_approx_equals(actual, expected, TIME_PRECISION, description);
+};
+
+/*
+ * Compare a time value based on its precision requirements with a fixed value.
+ */
+root.assert_time_equals_literal = (actual, expected, description) => {
+  assert_approx_equals(actual, expected, TIME_PRECISION, description);
+};
+
+/**
+ * Assert that CSSTransition event, |evt|, has the expected property values
+ * defined by |propertyName|, |elapsedTime|, and |pseudoElement|.
+ */
+root.assert_end_events_equal = function(evt, propertyName, elapsedTime,
+                                        pseudoElement = '') {
+  assert_equals(evt.propertyName, propertyName);
+  assert_times_equal(evt.elapsedTime, elapsedTime);
+  assert_equals(evt.pseudoElement, pseudoElement);
+};
+
+/**
+ * Assert that array of simultaneous CSSTransition events, |evts|, have the
+ * corresponding property names listed in |propertyNames|, and the expected
+ * |elapsedTimes| and |pseudoElement| members.
+ *
+ * |elapsedTimes| may be a single value if all events are expected to have the
+ * same elapsedTime, or an array parallel to |propertyNames|.
+ */
+root.assert_end_event_batch_equal = function(evts, propertyNames, elapsedTimes,
+                                             pseudoElement = '') {
+  assert_equals(
+    evts.length,
+    propertyNames.length,
+    'Test harness error: should have waited for the correct number of events'
+  );
+  assert_true(
+    typeof elapsedTimes === 'number' ||
+      (Array.isArray(elapsedTimes) &&
+        elapsedTimes.length === propertyNames.length),
+    'Test harness error: elapsedTimes must either be a number or an array of' +
+      ' numbers with the same length as propertyNames'
+  );
+
+  if (typeof elapsedTimes === 'number') {
+    elapsedTimes = Array(propertyNames.length).fill(elapsedTimes);
+  }
+  const testPairs = propertyNames.map((propertyName, index) => ({
+    propertyName,
+    elapsedTime: elapsedTimes[index]
+  }));
+
+  const sortByPropertyName = (a, b) =>
+    a.propertyName.localeCompare(b.propertyName);
+  evts.sort(sortByPropertyName);
+  testPairs.sort(sortByPropertyName);
+
+  for (let evt of evts) {
+    const expected = testPairs.shift();
+    assert_end_events_equal(
+      evt,
+      expected.propertyName,
+      expected.elapsedTime,
+      pseudoElement
+    );
+  }
+}
+
+/**
+ * Appends a div to the document body.
+ *
+ * @param t  The testharness.js Test object. If provided, this will be used
+ *           to register a cleanup callback to remove the div when the test
+ *           finishes.
+ *
+ * @param attrs  A dictionary object with attribute names and values to set on
+ *               the div.
+ */
+root.addDiv = function(t, attrs) {
+  var div = document.createElement('div');
+  if (attrs) {
+    for (var attrName in attrs) {
+      div.setAttribute(attrName, attrs[attrName]);
+    }
+  }
+  document.body.appendChild(div);
+  if (t && typeof t.add_cleanup === 'function') {
+    t.add_cleanup(function() {
+      if (div.parentNode) {
+        div.remove();
+      }
+    });
+  }
+  return div;
+};
+
+/**
+ * Appends a style div to the document head.
+ *
+ * @param t  The testharness.js Test object. If provided, this will be used
+ *           to register a cleanup callback to remove the style element
+ *           when the test finishes.
+ *
+ * @param rules  A dictionary object with selector names and rules to set on
+ *               the style sheet.
+ */
+root.addStyle = (t, rules) => {
+  const extraStyle = document.createElement('style');
+  document.head.appendChild(extraStyle);
+  if (rules) {
+    const sheet = extraStyle.sheet;
+    for (const selector in rules) {
+      sheet.insertRule(selector + '{' + rules[selector] + '}',
+                       sheet.cssRules.length);
+    }
+  }
+
+  if (t && typeof t.add_cleanup === 'function') {
+    t.add_cleanup(() => {
+      extraStyle.remove();
+    });
+  }
+  return extraStyle;
+};
+
+/**
+ * Promise wrapper for requestAnimationFrame.
+ */
+root.waitForFrame = () => {
+  return new Promise(resolve => {
+    window.requestAnimationFrame(resolve);
+  });
+};
+
+/**
+ * Returns a Promise that is resolved after the given number of consecutive
+ * animation frames have occured (using requestAnimationFrame callbacks).
+ *
+ * @param frameCount  The number of animation frames.
+ * @param onFrame  An optional function to be processed in each animation frame.
+ */
+root.waitForAnimationFrames = (frameCount, onFrame) => {
+  const timeAtStart = document.timeline.currentTime;
+  return new Promise(resolve => {
+    function handleFrame() {
+      if (onFrame && typeof onFrame === 'function') {
+        onFrame();
+      }
+      if (timeAtStart != document.timeline.currentTime &&
+          --frameCount <= 0) {
+        resolve();
+      } else {
+        window.requestAnimationFrame(handleFrame); // wait another frame
+      }
+    }
+    window.requestAnimationFrame(handleFrame);
+  });
+};
+
+/**
+ * Wrapper that takes a sequence of N animations and returns:
+ *
+ *   Promise.all([animations[0].ready, animations[1].ready, ... animations[N-1].ready]);
+ */
+root.waitForAllAnimations = animations =>
+  Promise.all(animations.map(animation => animation.ready));
+
+/**
+ * Utility that takes a Promise and a maximum number of frames to wait and
+ * returns a new Promise that behaves as follows:
+ *
+ * - If the provided Promise resolves _before_ the specified number of frames
+ *   have passed, resolves with the result of the provided Promise.
+ * - If the provided Promise rejects _before_ the specified number of frames
+ *   have passed, rejects with the error result of the provided Promise.
+ * - Otherwise, rejects with a 'Timed out' error message. If |message| is
+ *   provided, it will be appended to the error message.
+ */
+root.frameTimeout = (promiseToWaitOn, framesToWait, message) => {
+  let framesRemaining = framesToWait;
+  let aborted = false;
+
+  const timeoutPromise = new Promise(function waitAFrame(resolve, reject) {
+    if (aborted) {
+      resolve();
+      return;
+    }
+    if (framesRemaining-- > 0) {
+      requestAnimationFrame(() => {
+        waitAFrame(resolve, reject);
+      });
+      return;
+    }
+    let errorMessage = 'Timed out waiting for Promise to resolve';
+    if (message) {
+      errorMessage += `: ${message}`;
+    }
+    reject(new Error(errorMessage));
+  });
+
+  const wrappedPromiseToWaitOn = promiseToWaitOn.then(result => {
+    aborted = true;
+    return result;
+  });
+
+  return Promise.race([timeoutPromise, wrappedPromiseToWaitOn]);
+};
+
+root.supportsStartingStyle = () => {
+  let sheet = new CSSStyleSheet();
+  sheet.replaceSync("@starting-style{}");
+  return sheet.cssRules.length == 1;
+};
+
+})(window);
diff --git a/testing/web-platform/tests/css/css-transitions/support/import-green.css b/testing/web-platform/tests/css/css-transitions/support/import-green.css
new file mode 100644
index 0000000000..537104e663
--- /dev/null
+++ b/testing/web-platform/tests/css/css-transitions/support/import-green.css
@@ -0,0 +1 @@
+.import { color: green; }
diff --git a/testing/web-platform/tests/css/css-transitions/support/import-red.css b/testing/web-platform/tests/css/css-transitions/support/import-red.css
new file mode 100644
index 0000000000..9945ef4711
--- /dev/null
+++ b/testing/web-platform/tests/css/css-transitions/support/import-red.css
@@ -0,0 +1 @@
+.import { color: red; }
diff --git a/testing/web-platform/tests/css/css-transitions/support/one.gif b/testing/web-platform/tests/css/css-transitions/support/one.gif
new file mode 100644
index 0000000000..74cf7839c9
Binary files /dev/null and b/testing/web-platform/tests/css/css-transitions/support/one.gif differ
diff --git a/testing/web-platform/tests/css/css-transitions/support/pattern-grg-rgr-grg.png b/testing/web-platform/tests/css/css-transitions/support/pattern-grg-rgr-grg.png
new file mode 100644
index 0000000000..9b88fbd811
Binary files /dev/null and b/testing/web-platform/tests/css/css-transitions/support/pattern-grg-rgr-grg.png differ
diff --git a/testing/web-platform/tests/css/css-transitions/support/pattern-grg-rrg-rgg.png b/testing/web-platform/tests/css/css-transitions/support/pattern-grg-rrg-rgg.png
new file mode 100644
index 0000000000..fcf4f3fd7d
Binary files /dev/null and b/testing/web-platform/tests/css/css-transitions/support/pattern-grg-rrg-rgg.png differ
diff --git a/testing/web-platform/tests/css/css-transitions/support/pattern-rgr-grg-rgr.png b/testing/web-platform/tests/css/css-transitions/support/pattern-rgr-grg-rgr.png
new file mode 100644
index 0000000000..d454e3a630
Binary files /dev/null and b/testing/web-platform/tests/css/css-transitions/support/pattern-rgr-grg-rgr.png differ
diff --git a/testing/web-platform/tests/css/css-transitions/support/pattern-tr.png b/testing/web-platform/tests/css/css-transitions/support/pattern-tr.png
new file mode 100644
index 0000000000..8b4b25364e
Binary files /dev/null and b/testing/web-platform/tests/css/css-transitions/support/pattern-tr.png differ
diff --git a/testing/web-platform/tests/css/css-transitions/support/properties.js b/testing/web-platform/tests/css/css-transitions/support/properties.js
new file mode 100644
index 0000000000..0c0057b39e
--- /dev/null
+++ b/testing/web-platform/tests/css/css-transitions/support/properties.js
@@ -0,0 +1,410 @@
+(function(root){
+
+/*
+ * General Value Types definition
+ * they return an object of arrays of type { <name>: [<start-value>, <end-value>], ... }
+ */
+var values = {
+    'length' : function() {
+        // http://www.w3.org/TR/css3-values/#lengths
+        return {
+            // CSS Values and Module Level 3
+            // ch: ['1ch', '10ch'],
+            // rem: ['1rem', '10rem'],
+            // vw: ['1vw', '10vw'],
+            // vh: ['1vh', '10vh'],
+            // vmin: ['1vmin', '10vmin'],
+            // vmax: ['1vmax', '10vmax'],
+            // CSS Values and Module Level 2
+            pt: ['1pt', '10pt'],
+            pc: ['1pc', '10pc'],
+            px: ['1px', '10px'],
+            // CSS Values and Module Level 1
+            em: ['1em', '10em'],
+            ex: ['1ex', '10ex'],
+            mm: ['1mm', '10mm'],
+            cm: ['1cm', '10cm'],
+            'in': ['1in', '10in']
+        };
+    },
+    'length-em': function() {
+        return {
+            em: ['1.1em', '1.5em']
+        };
+    },
+    'percentage': function() {
+        // http://www.w3.org/TR/css3-values/#percentages
+        return {
+            '%': ['33%', '80%']
+        };
+    },
+    'color': function() {
+        // http://www.w3.org/TR/css3-values/#colors
+        // http://www.w3.org/TR/css3-color/
+        return {
+            rgba: ['rgba(100,100,100,1)', 'rgba(10,10,10,0.4)']
+        };
+    },
+    'rectangle': function() {
+        // http://www.w3.org/TR/CSS2/visufx.html#value-def-shape
+        return {
+            rectangle: ['rect(10px,10px,10px,10px)', 'rect(15px,15px,5px,5px)']
+        };
+    },
+    'font-weight': function() {
+        // http://www.w3.org/TR/css3-fonts/#font-weight-prop
+        return {
+            keyword: ["normal", "bold"],
+            numeric: ["100", "900"]
+        };
+    },
+    'number': function() {
+        // http://www.w3.org/TR/css3-values/#number
+        return {
+            integer: ["1", "10"],
+            decimal: ["1.1", "9.55"]
+        };
+    },
+    'number[0,1]': function() {
+        // http://www.w3.org/TR/css3-values/#number
+        // applies to [0,1]-ranged properties like opacity
+        return {
+            "zero-to-one": ["0.2", "0.9"]
+        };
+    },
+    'integer': function() {
+        // http://www.w3.org/TR/css3-values/#integer
+        return {
+            integer: ["1", "10"]
+        };
+    },
+    'shadow': function() {
+        // http://www.w3.org/TR/css-text-decor-3/#text-shadow-property
+        return {
+            shadow: ['rgba(0,0,0,0.1) 5px 6px 7px', 'rgba(10,10,10,0.9) 5px 6px 7px']
+        };
+    },
+    'visibility': function() {
+        // http://www.w3.org/TR/CSS2/visufx.html#visibility
+        return {
+            keyword: ['visible', 'hidden', {discrete: true}]
+        };
+    },
+    // types reqired for non-specified properties
+    'border-radius': function() {
+        return {
+            px: ['1px', '10px'],
+            "px-px": ['1px 3px', '10px 13px']
+        };
+    },
+    'image' : function() {
+        var prefix = getValueVendorPrefix('background-image', 'linear-gradient(top, hsl(0, 80%, 70%), #bada55)');
+        return {
+            // Chrome implements this
+            url: ['url(support/one.gif)', 'url(support/two.gif)'],
+            data: ['url(data:image/gif;base64,R0lGODlhAQABAAD/ACwAAAAAAQABAAACADs=)', 'url(data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///ywAAAAAAQABAAACAUwAOw==)'],
+            // A hunch, as from the spec:
+            // http://www.w3.org/TR/css3-transitions/#animatable-types
+            // gradient: interpolated via the positions and colors of each stop. They must have the same type (radial or linear) and same number of stops in order to be animated. Note: [CSS3-IMAGES] may extend this definition.
+            gradient: [prefix + 'linear-gradient(top, hsl(0, 80%, 70%), #bada55)', prefix + 'linear-gradient(top, #bada55, hsl(0, 80%, 70%))']
+        };
+    },
+    'background-size': function() {
+        return {
+            keyword: ['cover', 'contain']
+        };
+    },
+    'box-shadow': function() {
+        // http://www.w3.org/TR/css3-background/#ltshadowgt
+        return {
+            shadow: ['60px -16px teal', '60px -16px red']
+        };
+    },
+    'vertical': function() {
+        return {
+            keyword: ['top', 'bottom']
+        };
+    },
+    'horizontal': function() {
+        return {
+            keyword: ['left', 'right']
+        };
+    },
+    'font-stretch': function() {
+        return {
+            keyword: ['condensed', 'expanded']
+        };
+    },
+    'transform': function() {
+        return {
+            rotate: ['rotate(10deg)', 'rotate(20deg)']
+        };
+    },
+    'position': function() {
+        return {
+            'static to absolute': ['static', 'absolute', {discrete: true}],
+            'relative to absolute': ['relative', 'absolute', {discrete: true}],
+            'absolute to fixed': ['absolute', 'fixed', {discrete: true}]
+        };
+    },
+    'display': function() {
+        return {
+            'static to absolute': ['none', 'block', {discrete: true}],
+            'block to inline-block': ['block', 'inline-block', {discrete: true}]
+        };
+    },
+    'object-view-box': function() {
+        return {
+            inset: ['inset(10% 10% 20% 20%)', 'inset(20% 20% 30% 30%)'],
+            rect: ['rect(10px 20px 30px 40px)', 'rect(20px 30px 40px 50px)'],
+            xywh: ['xywh(10px 20px 30px 40px)', 'xywh(20px 30px 40px 50px)'],
+        };
+    }
+};
+
+/*
+ * Property to Type table
+ * (as stated in specification)
+ */
+var properties = {
+    'background-color': ['color'],
+    'background-position': ['length', 'percentage'],
+
+    'border-top-width': ['length'],
+    'border-right-width': ['length'],
+    'border-bottom-width': ['length'],
+    'border-left-width': ['length'],
+
+    'border-top-color': ['color'],
+    'border-right-color': ['color'],
+    'border-bottom-color': ['color'],
+    'border-left-color': ['color'],
+
+    'padding-bottom': ['length'],
+    'padding-left': ['length'],
+    'padding-right': ['length'],
+    'padding-top': ['length'],
+
+    'margin-bottom': ['length'],
+    'margin-left': ['length'],
+    'margin-right': ['length'],
+    'margin-top': ['length'],
+
+    'height': ['length', 'percentage'],
+    'width': ['length', 'percentage'],
+    'min-height': ['length', 'percentage'],
+    'min-width': ['length', 'percentage'],
+    'max-height': ['length', 'percentage'],
+    'max-width': ['length', 'percentage'],
+
+    'top': ['length', 'percentage'],
+    'right': ['length', 'percentage'],
+    'bottom': ['length', 'percentage'],
+    'left': ['length', 'percentage'],
+
+    'color': ['color'],
+    'font-size': ['length', 'percentage'],
+    'font-weight': ['font-weight'],
+    'line-height': ['number', 'length', 'percentage'],
+    'letter-spacing': ['length'],
+    // Note: percentage is Level3 and not implemented anywhere yet
+    // https://drafts.csswg.org/css3-text/#word-spacing
+    'word-spacing': ['length', 'percentage'],
+    'text-indent': ['length', 'percentage'],
+    'text-shadow': ['shadow'],
+
+    'outline-color': ['color'],
+    // outline-offset <integer> used to be an error in the spec
+    'outline-offset': ['length'],
+    'outline-width': ['length'],
+
+    'clip': ['rectangle'],
+
+    'vertical-align': ['length', 'percentage'],
+    'opacity': ['number[0,1]'],
+    'visibility': ['visibility'],
+    'z-index': ['integer']
+};
+
+/*
+ * Property to Type table
+ * (missing value-types of specified properties)
+ */
+var missing_properties = {
+    'margin-bottom': ['percentage'],
+    'margin-left': ['percentage'],
+    'margin-right': ['percentage'],
+    'margin-top': ['percentage'],
+    'padding-bottom': ['percentage'],
+    'padding-left': ['percentage'],
+    'padding-right': ['percentage'],
+    'padding-top': ['percentage'],
+    'vertical-align': ['vertical']
+};
+
+/*
+ * Property to Type table
+ * (properties that haven't been specified but implemented)
+ */
+var unspecified_properties = {
+    // http://oli.jp/2010/css-animatable-properties/
+    'border-top-left-radius': ['border-radius'],
+    'border-top-right-radius': ['border-radius'],
+    'border-bottom-left-radius': ['border-radius'],
+    'border-bottom-right-radius': ['border-radius'],
+    'background-image': ['image'],
+    'background-size': ['background-size'],
+    // https://drafts.csswg.org/css3-background/#the-box-shadow
+    // Animatable:   yes, except between inner and outer shadows (Transition to/from an absent shadow is a transition to/from ‘0 0 transparent’ or ‘0 0 transparent inset’, as appropriate.)
+    'box-shadow': ['box-shadow'],
+    'font-size-adjust': ['number'],
+    'font-stretch': ['font-stretch'],
+    'text-decoration-color': ['color'],
+    'column-count': ['integer'],
+    'column-gap': ['length'],
+    'column-rule-color': ['color'],
+    'column-rule-width': ['length'],
+    'column-width': ['length'],
+    'transform': ['transform'],
+    'transform-origin': ['horizontal'],
+    'display': ['display'],
+    'position': ['position'],
+    'object-view-box': ['object-view-box']
+};
+
+/*
+ * additional styles required to actually render
+ * (different browsers expect different environment)
+ */
+var additional_styles = {
+    // all browsers
+    'border-top-width': {'border-top-style' : 'solid'},
+    'border-right-width': {'border-right-style' : 'solid'},
+    'border-bottom-width': {'border-bottom-style' : 'solid'},
+    'border-left-width': {'border-left-style' : 'solid'},
+    'top': {'position': 'absolute'},
+    'right': {'position': 'absolute'},
+    'bottom': {'position': 'absolute'},
+    'left': {'position': 'absolute'},
+    'z-index': {'position': 'absolute'},
+    'outline-offset': {'outline-style': 'solid'},
+    'outline-width': {'outline-style': 'solid'},
+    'word-spacing': {'width': '100px', 'height': '100px'},
+    // unspecified properties
+    'column-rule-width': {'column-rule-style': 'solid'},
+    'position': {'width': '50px', 'height': '50px', top: '10px', left: '50px'}
+};
+
+/*
+ * additional styles required *on the parent* to actually render
+ * (different browsers expect different environment)
+ */
+var parent_styles = {
+    'border-top-width': {'border-top-style' : 'solid'},
+    'border-right-width': {'border-right-style' : 'solid'},
+    'border-bottom-width': {'border-bottom-style' : 'solid'},
+    'border-left-width': {'border-left-style' : 'solid'},
+    'height': {'width': '100px', 'height': '100px'},
+    'min-height': {'width': '100px', 'height': '100px'},
+    'max-height': {'width': '100px', 'height': '100px'},
+    'width': {'width': '100px', 'height': '100px'},
+    'min-width': {'width': '100px', 'height': '100px'},
+    'max-width': {'width': '100px', 'height': '100px'},
+    // unspecified properties
+    'position': {'position': 'relative', 'width': '100px', 'height': '100px'},
+    // inheritance tests
+    'top': {'width': '100px', 'height': '100px', 'position': 'relative'},
+    'right': {'width': '100px', 'height': '100px', 'position': 'relative'},
+    'bottom': {'width': '100px', 'height': '100px', 'position': 'relative'},
+    'left': {'width': '100px', 'height': '100px', 'position': 'relative'}
+};
+
+
+function assemble(props) {
+    var tests = [];
+
+    // assemble tests
+    for (var property in props) {
+        props[property].forEach(function(type) {
+            var _values = values[type](property);
+            Object.keys(_values).forEach(function(unit) {
+                var data = {
+                    name: property + ' ' + type + '(' + unit + ')',
+                    property: property,
+                    valueType : type,
+                    unit : unit,
+                    parentStyle: extend({}, parent_styles[property] || {}),
+                    from: extend({}, additional_styles[property] || {}),
+                    to: {}
+                };
+
+                data.from[property] = _values[unit][0];
+                data.to[property] = _values[unit][1];
+                data.flags = _values[unit][2] || {};
+
+                tests.push(data);
+            });
+        });
+    }
+
+    return tests;
+}
+
+root.getPropertyTests = function() {
+    return assemble(properties);
+};
+
+root.getMissingPropertyTests = function() {
+    return assemble(missing_properties);
+};
+
+root.getUnspecifiedPropertyTests = function() {
+    return assemble(unspecified_properties);
+};
+
+root.getFontSizeRelativePropertyTests = function() {
+    var accepted = {};
+
+    for (var key in properties) {
+        if (!Object.prototype.hasOwnProperty.call(properties, key) || key === "font-size") {
+            continue;
+        }
+
+        if (properties[key].indexOf('length') > -1) {
+            accepted[key] = ['length-em'];
+        }
+    }
+
+    return assemble(accepted);
+};
+
+root.filterPropertyTests = function(tests, names) {
+    var allowed = {};
+    var accepted = [];
+
+    if (typeof names === "string") {
+        names = [names];
+    }
+
+    if (!(names instanceof RegExp)) {
+        names.forEach(function(name) {
+            allowed[name] = true;
+        });
+    }
+
+    tests.forEach(function(test) {
+        if (names instanceof RegExp) {
+            if (!test.name.match(names)) {
+                return;
+            }
+        } else if (!allowed[test.name]) {
+            return;
+        }
+
+        accepted.push(test);
+    });
+
+    return accepted;
+};
+
+})(window);
diff --git a/testing/web-platform/tests/css/css-transitions/support/ruler-h-50%.png b/testing/web-platform/tests/css/css-transitions/support/ruler-h-50%.png
new file mode 100644
index 0000000000..cf2eea6b43
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diff --git a/testing/web-platform/tests/css/css-transitions/support/ruler-h-50px.png b/testing/web-platform/tests/css/css-transitions/support/ruler-h-50px.png
new file mode 100644
index 0000000000..9f46583665
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diff --git a/testing/web-platform/tests/css/css-transitions/support/ruler-v-100px.png b/testing/web-platform/tests/css/css-transitions/support/ruler-v-100px.png
new file mode 100644
index 0000000000..a837eca222
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diff --git a/testing/web-platform/tests/css/css-transitions/support/ruler-v-50px.png b/testing/web-platform/tests/css/css-transitions/support/ruler-v-50px.png
new file mode 100644
index 0000000000..8414102802
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diff --git a/testing/web-platform/tests/css/css-transitions/support/runParallelAsyncHarness.js b/testing/web-platform/tests/css/css-transitions/support/runParallelAsyncHarness.js
new file mode 100644
index 0000000000..de9b783790
--- /dev/null
+++ b/testing/web-platform/tests/css/css-transitions/support/runParallelAsyncHarness.js
@@ -0,0 +1,148 @@
+(function(root){
+'use strict';
+// testharness doesn't know about async test queues,
+// so this wrapper takes care of that
+
+/* USAGE:
+    runParallelAsyncHarness({
+        // list of data to test, must be array of objects.
+        // each object must contain a "name" property to describe the test
+        // besides name, the object can contain whatever data you need
+        tests: [
+            {name: "name of test 1", custom: "data"},
+            {name: "name of test 2", custom: "data"},
+            // ...
+        ],
+
+        // number of tests (tests, not test-cases!) to run concurrently
+        testsPerSlice: 100,
+
+        // time in milliseconds a test-run takes
+        duration: 1000,
+
+        // test-cases to run for for the test - there must be at least one
+        // each case creates its separate async_test() instance
+        cases: {
+            // test case named "test1"
+            test1: {
+                // run as a async_test.step() this callback contains your primary assertions
+                start: function(testCaseKey, data, options){},
+                // run as a async_test.step() this callback contains assertions to be run
+                // when the test ended, immediately before teardown
+                done: function(testCaseKey, data, options){}
+            },
+            // ...
+        }
+
+        // all callbacks are optional:
+
+        // invoked for individual test before it starts so you can setup the environment
+        // like DOM, CSS, adding event listeners and such
+        setup: function(data, options){},
+
+        // invoked after a test ended, so you can clean up the environment
+        // like DOM, CSS, removing event listeners and such
+        teardown: function(data, options){},
+
+        // invoked before a batch of tests ("slice") are run concurrently
+        // tests is an array of test data objects
+        sliceStart: function(options, tests)
+
+        // invoked after a batch of tests ("slice") were run concurrently
+        // tests is an array of test data objects
+        sliceDone: function(options, tests)
+
+        // invoked once all tests are done
+        done: function(options){}
+    })
+*/
+root.runParallelAsyncHarness = function(options) {
+    if (!options.cases) {
+        throw new Error("Options don't contain test cases!");
+    }
+
+    var noop = function(){};
+
+    // add a 100ms buffer to the test timeout, just in case
+    var duration = Math.ceil(options.duration + 100);
+
+    // names of individual tests
+    var cases = Object.keys(options.cases);
+
+    // run tests in a batch of slices
+    // primarily not to overload weak devices (tablets, phones, …)
+    // with too many tests running simultaneously
+    var iteration = -1;
+    var testPerSlice = options.testsPerSlice || 100;
+    var slices = Math.ceil(options.tests.length / testPerSlice);
+
+    // initialize all async test cases
+    // Note: satisfying testharness.js needs to know all async tests before load-event
+    options.tests.forEach(function(data, index) {
+        data.cases = {};
+        cases.forEach(function(name) {
+            data.cases[name] = async_test(data.name + " / " + name);
+        });
+    });
+
+    function runLoop() {
+        iteration++;
+        if (iteration >= slices) {
+            // no more slice, we're done
+            (options.done || noop)(options);
+            return;
+        }
+
+        // grab a slice of testss and initialize them
+        var offset = iteration * testPerSlice;
+        var tests = options.tests.slice(offset, offset + testPerSlice);
+        tests.forEach(function(data) {
+            (options.setup || noop)(data, options);
+
+        });
+
+        // kick off the current slice of tests
+        (options.sliceStart || noop)(options, tests);
+
+        // perform individual "start" test-case
+        tests.forEach(function(data) {
+            cases.forEach(function(name) {
+                data.cases[name].step(function() {
+                    (options.cases[name].start || noop)(data.cases[name], data, options);
+                });
+            });
+        });
+
+        // conclude slice (possibly abort)
+        var concludeSlice = function() {
+            tests.forEach(function(data) {
+                // perform individual "done" test-case
+                cases.forEach(function(name) {
+                    data.cases[name].step(function() {
+                        (options.cases[name].done || noop)(data.cases[name], data, options);
+                    });
+                });
+                // clean up after individual test
+                (options.teardown || noop)(data, options);
+                // tell harness we're done with individual test-cases
+                cases.forEach(function(name) {
+                    data.cases[name].done();
+                });
+            });
+
+            // finish the test for current slice of tests
+            (options.sliceDone || noop)(options, tests);
+
+            // next test please, give the browser 50ms to do catch its breath
+            setTimeout(runLoop, 50);
+        }
+
+        // wait on RAF before cleanup to make sure all queued event handlers have run
+        setTimeout(function() {requestAnimationFrame(concludeSlice)},duration);
+    }
+
+    // allow DOMContentLoaded before actually doing something
+    setTimeout(runLoop, 100);
+};
+
+})(window);
diff --git a/testing/web-platform/tests/css/css-transitions/support/square-purple.png b/testing/web-platform/tests/css/css-transitions/support/square-purple.png
new file mode 100644
index 0000000000..0f522d7872
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diff --git a/testing/web-platform/tests/css/css-transitions/support/square-teal.png b/testing/web-platform/tests/css/css-transitions/support/square-teal.png
new file mode 100644
index 0000000000..e567f51b91
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diff --git a/testing/web-platform/tests/css/css-transitions/support/square-white.png b/testing/web-platform/tests/css/css-transitions/support/square-white.png
new file mode 100644
index 0000000000..5853cbb238
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diff --git a/testing/web-platform/tests/css/css-transitions/support/support/README b/testing/web-platform/tests/css/css-transitions/support/support/README
new file mode 100644
index 0000000000..ea8cb9ef35
--- /dev/null
+++ b/testing/web-platform/tests/css/css-transitions/support/support/README
@@ -0,0 +1,4 @@
+The swatch-green.png file in this directory is really a RED swatch,
+and the swatch-red.png file is really a green swatch.
+
+This directory is used to test relative URIs.
\ No newline at end of file
diff --git a/testing/web-platform/tests/css/css-transitions/support/support/swatch-green.png b/testing/web-platform/tests/css/css-transitions/support/support/swatch-green.png
new file mode 100644
index 0000000000..1caf25c992
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diff --git a/testing/web-platform/tests/css/css-transitions/support/support/swatch-red.png b/testing/web-platform/tests/css/css-transitions/support/support/swatch-red.png
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diff --git a/testing/web-platform/tests/css/css-transitions/support/swatch-blue.png b/testing/web-platform/tests/css/css-transitions/support/swatch-blue.png
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diff --git a/testing/web-platform/tests/css/css-transitions/support/swatch-lime.png b/testing/web-platform/tests/css/css-transitions/support/swatch-lime.png
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index 0000000000..55fd7fdaed
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diff --git a/testing/web-platform/tests/css/css-transitions/support/swatch-orange.png b/testing/web-platform/tests/css/css-transitions/support/swatch-orange.png
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index 0000000000..d3cd498b52
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diff --git a/testing/web-platform/tests/css/css-transitions/support/swatch-red.png b/testing/web-platform/tests/css/css-transitions/support/swatch-red.png
new file mode 100644
index 0000000000..1caf25c992
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diff --git a/testing/web-platform/tests/css/css-transitions/support/swatch-teal.png b/testing/web-platform/tests/css/css-transitions/support/swatch-teal.png
new file mode 100644
index 0000000000..0293ce89de
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diff --git a/testing/web-platform/tests/css/css-transitions/support/swatch-white.png b/testing/web-platform/tests/css/css-transitions/support/swatch-white.png
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diff --git a/testing/web-platform/tests/css/css-transitions/support/swatch-yellow.png b/testing/web-platform/tests/css/css-transitions/support/swatch-yellow.png
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index 0000000000..1591aa0e2e
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diff --git a/testing/web-platform/tests/css/css-transitions/support/test-bl.png b/testing/web-platform/tests/css/css-transitions/support/test-bl.png
new file mode 100644
index 0000000000..904e24e996
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diff --git a/testing/web-platform/tests/css/css-transitions/support/test-br.png b/testing/web-platform/tests/css/css-transitions/support/test-br.png
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index 0000000000..f413ff5c1a
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diff --git a/testing/web-platform/tests/css/css-transitions/support/test-inner-half-size.png b/testing/web-platform/tests/css/css-transitions/support/test-inner-half-size.png
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index 0000000000..e473bf80ef
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diff --git a/testing/web-platform/tests/css/css-transitions/support/test-outer.png b/testing/web-platform/tests/css/css-transitions/support/test-outer.png
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index 0000000000..82eeace7fc
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diff --git a/testing/web-platform/tests/css/css-transitions/support/test-tl.png b/testing/web-platform/tests/css/css-transitions/support/test-tl.png
new file mode 100644
index 0000000000..f6ac0ef7e8
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diff --git a/testing/web-platform/tests/css/css-transitions/support/test-tr.png b/testing/web-platform/tests/css/css-transitions/support/test-tr.png
new file mode 100644
index 0000000000..59843ae54b
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diff --git a/testing/web-platform/tests/css/css-transitions/support/two.gif b/testing/web-platform/tests/css/css-transitions/support/two.gif
new file mode 100644
index 0000000000..01435c8020
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diff --git a/testing/web-platform/tests/css/css-transitions/support/vendorPrefix.js b/testing/web-platform/tests/css/css-transitions/support/vendorPrefix.js
new file mode 100644
index 0000000000..1e7eed0481
--- /dev/null
+++ b/testing/web-platform/tests/css/css-transitions/support/vendorPrefix.js
@@ -0,0 +1,86 @@
+//
+// Vendor-Prefix Helper Functions For Testing CSS
+//
+
+(function(root) {
+'use strict';
+
+var prefixCache = {};
+
+// convert "foo-bar" to "fooBar"
+function camelCase(str) {
+    return str.replace(/\-(\w)/g, function(match, letter){
+        return letter.toUpperCase();
+    });
+}
+
+// vendor-prefix a css property
+root.addVendorPrefix = function (name) {
+    var prefix = getVendorPrefix(name);
+    if (prefix === false) {
+        // property unknown to browser
+        return name;
+    }
+
+    return prefix + name;
+};
+
+// vendor-prefix a css property value
+root.addValueVendorPrefix = function (property, value) {
+    var prefix = getValueVendorPrefix(property, value);
+    if (prefix === false) {
+        // property unknown to browser
+        return name;
+    }
+
+    return prefix + value;
+};
+
+// identify vendor-prefix for css property
+root.getVendorPrefix = function(name) {
+    if (prefixCache[name] !== undefined) {
+        return prefixCache[name];
+    }
+
+    var elem = document.createElement("div");
+    name = camelCase(name);
+
+    if (name in elem.style) {
+        return prefixCache[name] = "";
+    }
+
+    var prefixes = ["Webkit", "Moz", "O", "ms"];
+    var styles = ["-webkit-", "-moz-", "-o-", "-ms-"];
+    var _name = name.substring(0, 1).toUpperCase() + name.substring(1);
+
+    for (var i = 0, length = prefixes.length; i < length; i++) {
+        if (prefixes[i] + _name in elem.style) {
+            return prefixCache[name] = styles[i];
+        }
+    }
+
+    return prefixCache[name] = name in elem.style ? "" : false;
+};
+
+// identify vendor-prefix for css property value
+root.getValueVendorPrefix = function(property, value) {
+    var elem = document.createElement("div");
+    // note: webkit needs the element to be attached to the dom
+    document.body.appendChild(elem);
+    var styles = ["-webkit-", "-moz-", "-o-", "-ms-", ""];
+    var _property = getVendorPrefix(property) + property;
+    for (var i=0, length = styles.length; i < length; i++) {
+        var _value = styles[i] + value;
+        elem.setAttribute('style', _property + ": " + _value);
+        var _computed = computedStyle(elem, _property);
+        if (_computed && _computed !== 'none') {
+            document.body.removeChild(elem);
+            return styles[i];
+        }
+    }
+    document.body.removeChild(elem);
+    return false;
+};
+
+
+})(window);
-- 
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