Adding upstream version 124.0.1.upstream/124.0.1

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

10 files changed, 931 insertions, 0 deletions

diff --git a/testing/web-platform/tests/mathml/support/attribute-values.js b/testing/web-platform/tests/mathml/support/attribute-values.js
new file mode 100644
index 0000000000..8408124f49
--- /dev/null
+++ b/testing/web-platform/tests/mathml/support/attribute-values.js
@@ -0,0 +1,31 @@
+AttributeValueTransforms = {
+    lowercase: function(value) { return value.toLowerCase(); },
+    uppercase: function(value) { return value.toUpperCase(); },
+    alternate_case: function(value) {
+        var transformedValue = "";
+        for (var i = 0; i < value.length; i++) {
+            transformedValue += i % 2 ?
+                value.charAt(i).toLowerCase() :
+                value.charAt(i).toUpperCase();
+        }
+        return transformedValue;
+    },
+    // TODO: Should we perform this transform too?
+    // https://github.com/mathml-refresh/mathml/issues/122
+    // add_leading_and_trimming_whitespace: function(value) {
+    //    var space = "\0020\0009\000A\000D";
+    //    return `${space}${space}${value}${space}${space}`;
+    // },
+};
+
+function TransformAttributeValues(transform, attributeNames) {
+    if (typeof attributeNames === "string")
+        attributeNames = [attributeNames];
+    attributeNames.forEach(name => {
+        Array.from(document.querySelectorAll(`[${name}]`)).forEach(element => {
+            var value = element.getAttribute(name);
+            var transformedValue = AttributeValueTransforms[transform](value);
+            element.setAttribute(name, transformedValue);
+        });
+    });
+}
diff --git a/testing/web-platform/tests/mathml/support/box-comparison.js b/testing/web-platform/tests/mathml/support/box-comparison.js
new file mode 100644
index 0000000000..b30ad279df
--- /dev/null
+++ b/testing/web-platform/tests/mathml/support/box-comparison.js
@@ -0,0 +1,107 @@
+function spaceBetween(childBox, parentBox) {
+    return {
+        left: childBox.left - parentBox.left,
+        right: parentBox.right - childBox.right,
+        top: childBox.top - parentBox.top,
+        bottom: parentBox.bottom - childBox.bottom
+    };
+}
+
+function measureSpaceAround(id) {
+    var mrow = document.getElementById(id);
+    var mrowBox = mrow.getBoundingClientRect();
+    var parentBox = mrow.parentNode.getBoundingClientRect();
+    var childBox = mrow.firstElementChild.getBoundingClientRect();
+    return spaceBetween(childBox, parentBox);
+}
+
+function compareSpaceWithAndWithoutStyle(tag, style, parentStyle, direction) {
+    if (!FragmentHelper.isValidChildOfMrow(tag) ||
+        FragmentHelper.isEmpty(tag))
+        throw `Invalid argument: ${tag}`;
+
+    if (!direction)
+      direction = "ltr";
+    document.body.insertAdjacentHTML("beforeend", `<div style="position: absolute;">\
+<div style="display: inline-block"><math><mrow dir="${direction}">${MathMLFragments[tag]}</mrow></math></div>\
+<div style="display: inline-block"><math><mrow dir="${direction}">${MathMLFragments[tag]}</mrow></math></div>\
+</div>`);
+    var div = document.body.lastElementChild;
+
+    var styleDiv = div.firstElementChild;
+    var styleMath = styleDiv.firstElementChild;
+    var styleParent = styleMath.firstElementChild;
+    if (parentStyle)
+        styleParent.setAttribute("style", parentStyle);
+    var styleElement = FragmentHelper.element(styleMath);
+    styleElement.setAttribute("style", style);
+    var styleChild = FragmentHelper.forceNonEmptyElement(styleElement);
+    var styleMathBox = styleMath.getBoundingClientRect();
+    var styleElementBox = styleElement.getBoundingClientRect();
+    var styleChildBox = styleChild.getBoundingClientRect();
+    var styleSpace = spaceBetween(styleChildBox, styleMathBox);
+
+    var noStyleDiv = div.lastElementChild;
+    var noStyleMath = noStyleDiv.firstElementChild;
+    var noStyleElement = FragmentHelper.element(noStyleMath);
+    var noStyleChild = FragmentHelper.forceNonEmptyElement(noStyleElement);
+    var noStyleMathBox = noStyleMath.getBoundingClientRect();
+    var noStyleElementBox = noStyleElement.getBoundingClientRect();
+    var noStyleChildBox = noStyleChild.getBoundingClientRect();
+    var noStyleSpace = spaceBetween(noStyleChildBox, noStyleMathBox);
+
+    var preferredWidthDelta =
+        styleDiv.getBoundingClientRect().width -
+        noStyleDiv.getBoundingClientRect().width;
+
+    div.style = "display: none;"; // Hide the div after measurement.
+
+    return {
+        preferred_width_delta: preferredWidthDelta,
+        left_delta: styleSpace.left - noStyleSpace.left,
+        right_delta: styleSpace.right - noStyleSpace.right,
+        top_delta: styleSpace.top - noStyleSpace.top,
+        bottom_delta: styleSpace.bottom - noStyleSpace.bottom,
+        element_width_delta: styleElementBox.width - noStyleElementBox.width,
+        element_height_delta: styleElementBox.height - noStyleElementBox.height
+    };
+}
+
+function compareSizeWithAndWithoutStyle(tag, style) {
+    if (!FragmentHelper.isValidChildOfMrow(tag))
+        throw `Invalid argument: ${tag}`;
+
+    // FIXME <mrow> only needed as workaround for https://bugzilla.mozilla.org/show_bug.cgi?id=1658135
+    document.body.insertAdjacentHTML("beforeend", `<div style="position: absolute;">\
+<div style="display: inline-block"><math><mrow>${MathMLFragments[tag]}</mrow></math></div>\
+<div style="display: inline-block"><math><mrow>${MathMLFragments[tag]}</mrow></math></div>\
+</div>`);
+    var div = document.body.lastElementChild;
+
+    var styleDiv = div.firstElementChild;
+    var styleParent = styleDiv.firstElementChild.firstElementChild;
+    var styleElement = FragmentHelper.element(styleParent);
+    styleElement.setAttribute("style", style);
+    var styleParentBox = styleParent.getBoundingClientRect();
+    var styleElementBox = styleElement.getBoundingClientRect();
+
+    var noStyleDiv = div.lastElementChild;
+    var noStyleParent = noStyleDiv.firstElementChild.firstElementChild;
+    var noStyleElement = FragmentHelper.element(noStyleParent);
+    var noStyleParentBox = noStyleParent.getBoundingClientRect();
+    var noStyleElementBox = noStyleElement.getBoundingClientRect();
+
+    var preferredWidthDelta =
+        styleDiv.getBoundingClientRect().width -
+        noStyleDiv.getBoundingClientRect().width;
+
+    div.style = "display: none;"; // Hide the div after measurement.
+
+    return {
+        preferred_width_delta: preferredWidthDelta,
+        width_delta: styleParentBox.width - noStyleParentBox.width,
+        height_delta: styleParentBox.height - noStyleParentBox.height,
+        element_width_delta: styleElementBox.width - noStyleElementBox.width,
+        element_height_delta: styleElementBox.height - noStyleElementBox.height
+    };
+};
diff --git a/testing/web-platform/tests/mathml/support/box-navigation.js b/testing/web-platform/tests/mathml/support/box-navigation.js
new file mode 100644
index 0000000000..f4897cfe99
--- /dev/null
+++ b/testing/web-platform/tests/mathml/support/box-navigation.js
@@ -0,0 +1,29 @@
+function IsInFlow(element) {
+    var style = window.getComputedStyle(element);
+    return style.getPropertyValue("display") !== "none" &&
+        style.getPropertyValue("position") !== "absolute" &&
+        style.getPropertyValue("position") !== "fixed";
+}
+
+function firstInFlowChild(element) {
+    var child = element.firstElementChild;
+    if (!child || IsInFlow(child))
+        return child;
+    return nextInFlowSibling(child);
+}
+
+function nextInFlowSibling(element) {
+    var child = element;
+    do {
+        child = child.nextElementSibling;
+    } while (child && !IsInFlow(child));
+    return child;
+}
+
+function previousInFlowSibling(element) {
+    var child = element;
+    do {
+        child = child.previousElementSibling;
+    } while (child && !IsInFlow(child));
+    return child;
+}
diff --git a/testing/web-platform/tests/mathml/support/feature-detection-operators.js b/testing/web-platform/tests/mathml/support/feature-detection-operators.js
new file mode 100644
index 0000000000..25dae40258
--- /dev/null
+++ b/testing/web-platform/tests/mathml/support/feature-detection-operators.js
@@ -0,0 +1,86 @@
+// This is a helper for MathML feature detection.
+// It is indented to be used to prevent false negative test results.
+// This adds operator-specific feature detections.
+
+Object.assign(MathMLFeatureDetection, {
+    "has_operator_lspace/rspace": async function() {
+        return this.has_operator_spacing();
+    },
+
+    "has_operator_movablelimits": async function() {
+        return this.has_movablelimits();
+    },
+
+    "has_operator_largeop": async function() {
+        if (!this.hasOwnProperty("_has_operator_largeop")) {
+            document.body.insertAdjacentHTML("beforeend", "\
+<math style='font: 10px HasOperatorLargeopTestFont;'\
+      displaystyle='true'>\
+  <mo largeop='false' stretchy='false' symmetric='false'>&#x2AFF;</mo>\
+  <mo largeop='true' stretchy='false' symmetric='false'>&#x2AFF;</mo>\
+</math>");
+            let font_face = new FontFace('HasOperatorLargeopTestFont',
+                'url(/fonts/math/largeop-displayoperatorminheight5000.woff)');
+            document.fonts.add(font_face);
+            await font_face.load();
+            var math = document.body.lastElementChild;
+            var mo = math.getElementsByTagName("mo");
+            this._has_operator_largeop =
+                (mo[1].getBoundingClientRect().height >
+                 mo[0].getBoundingClientRect().height);
+            document.body.removeChild(math);
+            document.fonts.delete(font_face);
+        }
+        return this._has_operator_largeop;
+    },
+
+    "has_operator_stretchy": async function() {
+        if (!this.hasOwnProperty("_has_operator_stretchy")) {
+            document.body.insertAdjacentHTML("beforeend", "\
+<math style='font: 10px HasOperatorStretchyTestFont;'>\
+  <mrow>\
+    <mo stretchy='false' largeop='false' symmetric='false'>&#x2AFF;</mo>\
+    <mo stretchy='true' largeop='false' symmetric='false'>&#x2AFF;</mo>\
+    <mspace style='background: black;' width='1px' height='2em'></mspace>\
+  </mrow>\
+</math>");
+            let font_face = new FontFace('HasOperatorLargeopTestFont',
+                'url(/fonts/math/largeop-displayoperatorminheight5000.woff)');
+            document.fonts.add(font_face);
+            await font_face.load();
+            var math = document.body.lastElementChild;
+            var mo = math.getElementsByTagName("mo");
+            this._has_operator_stretchy =
+                (mo[1].getBoundingClientRect().height >
+                 mo[0].getBoundingClientRect().height);
+            document.body.removeChild(math);
+            document.fonts.delete(font_face);
+        }
+        return this._has_operator_stretchy;
+    },
+
+    "has_operator_symmetric": async function() {
+        if (!this.hasOwnProperty("_has_operator_symmetric")) {
+            document.body.insertAdjacentHTML("beforeend", "\
+<math style='font: 10px HasOperatorSymmetricTestFont;'>\
+  <mrow>\
+    <mo stretchy='true' largeop='false' symmetric='false'>&#x2AFF;</mo>\
+    <mo stretchy='true' largeop='false' symmetric='true'>&#x2AFF;</mo>\
+    <mspace style='background: black;' width='1px' height='2em'></mspace>\
+  </mrow>\
+</math>");
+            let font_face = new FontFace('HasOperatorLargeopTestFont',
+                'url(/fonts/math/largeop-displayoperatorminheight5000.woff)');
+            document.fonts.add(font_face);
+            await font_face.load();
+            var math = document.body.lastElementChild;
+            var mo = math.getElementsByTagName("mo");
+            this._has_operator_symmetric =
+                (mo[1].getBoundingClientRect().height >
+                 mo[0].getBoundingClientRect().height);
+            document.body.removeChild(math);
+            document.fonts.delete(font_face);
+        }
+        return this._has_operator_symmetric;
+    },
+});
diff --git a/testing/web-platform/tests/mathml/support/feature-detection.js b/testing/web-platform/tests/mathml/support/feature-detection.js
new file mode 100644
index 0000000000..8b3f227d44
--- /dev/null
+++ b/testing/web-platform/tests/mathml/support/feature-detection.js
@@ -0,0 +1,325 @@
+// This is a helper for MathML feature detection.
+// It is indented to be used to prevent false negative test results.
+
+var MathMLFeatureDetection = {
+
+    "has_annotation": function() {
+        // FIXME: Improve feature detection.
+        return this.has_mspace();
+    },
+
+    "has_annotation-xml": function() {
+        // FIXME: Improve feature detection.
+        return this.has_mspace();
+    },
+
+    "has_maction": function() {
+        // FIXME: Improve feature detection.
+        return this.has_mspace();
+    },
+
+    "has_math": function() {
+        // FIXME: Improve feature detection.
+        return this.has_mspace();
+    },
+
+    "has_menclose": function() {
+        // Just check whether <mrow> is supported because discussion on this is
+        // still open ( https://github.com/mathml-refresh/mathml/issues/105 )
+        // and it would have to behave at least like an mrow, even if it becomes
+        // an unknown element at the end.
+        return this.has_mrow();
+    },
+
+    "has_merror": function() {
+        // FIXME: Improve feature detection.
+        return this.has_mspace();
+    },
+
+    "has_mfrac": function() {
+        if (!this.hasOwnProperty("_has_mfrac")) {
+            // Use tall enough fraction to avoid side effect of min num/denum shifts.
+            document.body.insertAdjacentHTML("beforeend", "<math>\
+<mfrac>\
+  <mspace height='50px' depth='50px'></mspace>\
+  <mspace height='50px' depth='50px'></mspace>\
+</mfrac>\
+<mfrac>\
+  <mspace height='60px' depth='60px'></mspace>\
+  <mspace height='60px' depth='60px'></mspace>\
+</mfrac>\
+</math>");
+            var math = document.body.lastElementChild;
+            var mfrac = math.getElementsByTagName("mfrac");
+            // height/depth will add 40px per MathML, 20px if mfrac does not stack its children and none if mspace is not supported.
+            this._has_mfrac =
+                mfrac[1].getBoundingClientRect().height -
+                mfrac[0].getBoundingClientRect().height > 30;
+            document.body.removeChild(math);
+        }
+        return this._has_mfrac;
+    },
+
+    "has_mi": function() {
+        // FIXME: Improve feature detection.
+        return this.has_mspace();
+    },
+
+    "has_mmultiscripts": function() {
+        // FIXME: Improve feature detection.
+        return this.has_mspace();
+    },
+
+    "has_mn": function() {
+        // FIXME: Improve feature detection.
+        return this.has_mspace();
+    },
+
+    "has_mo": function() {
+        // FIXME: Improve feature detection.
+        return this.has_mspace();
+    },
+
+    "has_mover": function() {
+        // FIXME: Improve feature detection.
+        return this.has_munderover();
+    },
+
+    "has_mpadded": function() {
+        // FIXME: Improve feature detection.
+        return this.has_mspace();
+    },
+
+    "has_mphantom": function() {
+        // FIXME: Improve feature detection.
+        return this.has_mspace();
+    },
+
+    "has_mprescripts": function() {
+        // FIXME: Improve feature detection.
+        return this.has_mspace();
+    },
+
+    "has_mroot": function() {
+        // FIXME: Improve feature detection.
+        return this.has_msqrt();
+    },
+
+    "has_mrow": function() {
+        // FIXME: Improve feature detection.
+        return this.has_mspace();
+    },
+
+    "has_ms": function() {
+        // FIXME: Improve feature detection.
+        return this.has_mspace();
+    },
+
+    "has_mspace": function() {
+        // https://w3c.github.io/mathml-core/#space-mspace
+        if (!this.hasOwnProperty("_has_mspace")) {
+            document.body.insertAdjacentHTML("beforeend", "<math>\
+<mspace></mspace>\
+<mspace width='20px'></mspace>\
+</math>");
+            var math = document.body.lastElementChild;
+            // The width attribute will add 20px per MathML and none if not supported.
+            this._has_mspace =
+                math.lastChild.getBoundingClientRect().width -
+                math.firstChild.getBoundingClientRect().width > 10;
+            document.body.removeChild(math);
+        }
+        return this._has_mspace;
+    },
+
+    "has_msqrt": function() {
+        if (!this.hasOwnProperty("_has_msqrt")) {
+            document.body.insertAdjacentHTML("beforeend", "<math>\
+<mrow style='font-size: 20px !important'>\
+  <mtext>A</mtext>\
+</mrow>\
+<msqrt style='font-size: 20px !important'>\
+  <mtext>A</mtext>\
+</msqrt>\
+</math>");
+            var math = document.body.lastElementChild;
+            // The radical symbol will make msqrt wider than mrow, if the former is supported.
+            this._has_msqrt =
+                math.lastElementChild.getBoundingClientRect().width -
+                math.firstElementChild.getBoundingClientRect().width > 5;
+            document.body.removeChild(math);
+        }
+        return this._has_msqrt;
+    },
+
+    "has_mstyle": function() {
+        // FIXME: Improve feature detection.
+        return this.has_mspace();
+    },
+
+    "has_msub": function() {
+        // FIXME: Improve feature detection.
+        return this.has_mspace();
+    },
+
+    "has_msubsup": function() {
+        // FIXME: Improve feature detection.
+        return this.has_mspace();
+    },
+
+    "has_msup": function() {
+        // FIXME: Improve feature detection.
+        return this.has_mspace();
+    },
+
+    "has_mtable": function() {
+        // FIXME: Improve feature detection.
+        return this.has_mspace();
+    },
+
+    "has_mtd": function() {
+        // FIXME: Improve feature detection.
+        return this.has_mspace();
+    },
+
+    "has_mtext": function() {
+        // FIXME: Improve feature detection.
+        return this.has_mspace();
+    },
+
+    "has_mtr": function() {
+        // FIXME: Improve feature detection.
+        return this.has_mspace();
+    },
+
+    "has_munder": function() {
+        // FIXME: Improve feature detection.
+        return this.has_munderover();
+    },
+
+    "has_munderover": function() {
+        if (!this.hasOwnProperty("_has_munderover")) {
+            document.body.insertAdjacentHTML("beforeend", "<math>\
+<munderover>\
+  <mspace width='20px'></mspace>\
+  <mspace width='20px'></mspace>\
+  <mspace width='20px'></mspace>\
+</munderover>\
+<munderover>\
+  <mspace width='40px'></mspace>\
+  <mspace width='40px'></mspace>\
+  <mspace width='40px'></mspace>\
+</munderover>\
+</math>");
+            var math = document.body.lastElementChild;
+            var munderover = math.getElementsByTagName("munderover");
+            // width_delta will be 20px per MathML, 3 * 20 = 60px if mundeover does not stack its children and 0px if mspace is not supported.
+            var width_delta =
+                munderover[1].getBoundingClientRect().width -
+                munderover[0].getBoundingClientRect().width;
+            this._has_munderover = width_delta > 10 && width_delta < 30;
+            document.body.removeChild(math);
+        }
+        return this._has_munderover;
+    },
+
+    "has_none": function() {
+        // FIXME: Improve feature detection.
+        return this.has_mspace();
+    },
+
+    "has_semantics": function() {
+        // FIXME: Improve feature detection.
+        return this.has_mspace();
+    },
+
+    "has_dir": function() {
+        if (!this.hasOwnProperty("_has_dir")) {
+            document.body.insertAdjacentHTML("beforeend", "<math style='direction: ltr !important;'>\
+<mtext dir='rtl'></mtext>\
+</math>");
+            var math = document.body.lastElementChild;
+            this._has_dir =
+                window.getComputedStyle(math.firstElementChild).
+                getPropertyValue('direction') === 'rtl';
+            document.body.removeChild(math);
+        }
+        return this._has_dir;
+    },
+
+    "has_mathsize": function() {
+        if (!this.hasOwnProperty("_has_mathsize")) {
+            document.body.insertAdjacentHTML("beforeend", "<math style='font-size: 64px !important;'>\
+<mtext mathsize='32px'></mtext>\
+</math>");
+            var math = document.body.lastElementChild;
+            this._has_mathsize =
+                window.getComputedStyle(math.firstElementChild).
+                getPropertyValue('font-size') === '32px';
+            document.body.removeChild(math);
+        }
+        return this._has_mathsize;
+    },
+
+    "has_movablelimits": function() {
+        if (!this.hasOwnProperty("_has_movablelimits")) {
+            document.body.insertAdjacentHTML("beforeend", "<math>\
+<munder>\
+  <mo style='font-size: 30px !important' movablelimits='false'>A</mo>\
+  <mspace width='100px'></mspace>\
+</munder>\
+<munder>\
+  <mo style='font-size: 30px !important' movablelimits='true'>A</mo>\
+  <mspace width='100px'></mspace>\
+</munder>\
+</math>");
+            var math = document.body.lastElementChild;
+            var munder = math.getElementsByTagName("munder");
+            // If movablelimits is supported, the <mspace> will be placed next
+            // to <mo> rather than below it, so width_delta is about the width
+            // of the <mo>.
+            var width_delta =
+                munder[1].getBoundingClientRect().width -
+                munder[0].getBoundingClientRect().width;
+            this._has_movablelimits = this.has_munder() && width_delta > 20;
+            document.body.removeChild(math);
+        }
+        return this._has_movablelimits;
+    },
+
+    "has_operator_spacing": function() {
+        // https://w3c.github.io/mathml-core/#dfn-lspace
+        // https://w3c.github.io/mathml-core/#layout-of-mrow
+        if (!this.hasOwnProperty("_has_operator_spacing")) {
+            document.body.insertAdjacentHTML("beforeend", "<math>\
+<mrow>\
+  <mn>1</mn><mo lspace='0px' rspace='0px'>+</mo><mn>2</mn>\
+</mrow>\
+<mrow>\
+  <mn>1</mn><mo lspace='20px' rspace='20px'>+</mo><mn>2</mn>\
+</mrow>\
+</math>");
+            var math = document.body.lastElementChild;
+            var mrow = math.getElementsByTagName("mrow");
+            // lspace/rspace will add 40px per MathML and none if not supported.
+            this._has_operator_spacing =
+                mrow[1].getBoundingClientRect().width -
+                mrow[0].getBoundingClientRect().width > 30;
+            document.body.removeChild(math);
+        }
+        return this._has_operator_spacing;
+    },
+
+    ensure_for_match_reftest: function(has_function) {
+        if (!document.querySelector("link[rel='match']"))
+            throw "This function must only be used for match reftest";
+        // Add a little red square at the top left corner if the feature is not supported in order to make match reftest fail.
+        if (!this[has_function]()) {
+            document.body.insertAdjacentHTML("beforeend", "\
+<div style='width: 10px !important; height: 10px !important;\
+            position: absolute !important;\
+            left: 0 !important; top: 0 !important;\
+            background: red !important; z-index: 1000 !important;'></div>");
+        }
+    }
+};
diff --git a/testing/web-platform/tests/mathml/support/fonts.js b/testing/web-platform/tests/mathml/support/fonts.js
new file mode 100644
index 0000000000..f05d7278ad
--- /dev/null
+++ b/testing/web-platform/tests/mathml/support/fonts.js
@@ -0,0 +1,9 @@
+function loadAllFonts() {
+  // Use this to wait for all fonts in a testcase to load rather than just using
+  // `document.fonts.ready.then(...)` in the load event, since there are compat
+  // issues between browsers as to whether content initiated font loads are
+  // guaranteed to have been started by this point.
+
+  // FIXME: Use Promise.all() to cause an obvious failure when a font fails to load.
+  return Promise.allSettled([...document.fonts].map(f => f.load()));
+}
diff --git a/testing/web-platform/tests/mathml/support/layout-comparison.js b/testing/web-platform/tests/mathml/support/layout-comparison.js
new file mode 100644
index 0000000000..452b45006e
--- /dev/null
+++ b/testing/web-platform/tests/mathml/support/layout-comparison.js
@@ -0,0 +1,112 @@
+function getWritingMode(element, reference) {
+    var style = window.getComputedStyle(reference);
+    if (style.getPropertyValue("writing-mode") !== "horizontal-tb" ||
+        style.getPropertyValue("direction") !== "ltr")
+        throw "Reference should have writing mode horizontal-tb and ltr";
+
+    style = window.getComputedStyle(element);
+    var param =  {
+        rtl: style.getPropertyValue("direction") === "rtl",
+        mode: style.getPropertyValue("writing-mode")
+    };
+
+    return param;
+}
+
+function compareSize(element, reference, epsilon) {
+    var param = getWritingMode(element, reference);
+    var elementBox = element.getBoundingClientRect();
+    var referenceBox = reference.getBoundingClientRect();
+
+    switch(param.mode) {
+    case "horizontal-tb":
+        assert_approx_equals(elementBox.width, referenceBox.width, epsilon,
+                             "inline size");
+        assert_approx_equals(elementBox.height, referenceBox.height, epsilon,
+                             "block size");
+        break;
+    case "vertical-lr":
+    case "vertical-rl":
+        assert_approx_equals(elementBox.width, referenceBox.height, epsilon,
+                             "inline size");
+        assert_approx_equals(elementBox.height, referenceBox.width, epsilon,
+                             "block size");
+        break;
+    default:
+        throw "compareSize: Unrecognized writing-mode value";
+    }
+}
+
+function childrenHaveEmptyBoundingClientRects(element) {
+    Array.from(element.children).forEach(child => {
+        var childBox = child.getBoundingClientRect();
+        assert_true(childBox.left == 0 && childBox.right == 0 && childBox.top == 0 && childBox.bottom == 0);
+    })
+}
+
+function participateToParentLayout(child) {
+    var style = window.getComputedStyle(child);
+    return style.getPropertyValue("display") !== "none" &&
+        style.getPropertyValue("position") !== "absolute" &&
+        style.getPropertyValue("position") !== "fixed";
+}
+
+function childrenParticipatingToLayout(element) {
+    var children = [];
+    Array.from(element.children).forEach(child => {
+        if (participateToParentLayout(child))
+            children.push(child);
+    })
+    return children;
+}
+
+function compareLayout(element, reference, epsilon) {
+    // Compare sizes of elements and children.
+    var param = getWritingMode(element, reference);
+
+    compareSize(element, reference, epsilon);
+    var elementBox = element.getBoundingClientRect();
+    var referenceBox = reference.getBoundingClientRect();
+
+    var elementChildren = childrenParticipatingToLayout(element);
+    var referenceChildren = childrenParticipatingToLayout(reference);
+    if (elementChildren.length != referenceChildren.length)
+        throw "Reference should have the same number of children participating to layout."
+
+    for (var i = 0; i < elementChildren.length; i++) {
+        compareSize(elementChildren[i], referenceChildren[i], epsilon);
+
+        var childBox = elementChildren[i].getBoundingClientRect();
+        var referenceChildBox = referenceChildren[i].getBoundingClientRect();
+
+        switch(param.mode) {
+        case "horizontal-tb":
+            assert_approx_equals(param.rtl ?
+                                 elementBox.right - childBox.right :
+                                 childBox.left - elementBox.left,
+                                 referenceChildBox.left - referenceBox.left,
+                                 epsilon,
+                                 `inline position (child ${i})`);
+            assert_approx_equals(childBox.top - elementBox.top,
+                                 referenceChildBox.top - referenceBox.top,
+                                 epsilon,
+                                 `block position (child ${i})`);
+            break;
+        case "vertical-lr":
+        case "vertical-rl":
+            assert_approx_equals(param.rtl ?
+                                 elementBox.bottom - childBox.bottom :
+                                 childBox.top - elementBox.top,
+                                 referenceChildBox.left - referenceBox.left,
+                                 epsilon,
+                                 `inline position (child ${i})`);
+            assert_approx_equals(elementBox.right - childBox.right,
+                                 referenceChildBox.top - referenceBox.top,
+                                 epsilon,
+                                 `block position (child ${i})`);
+            break;
+        default:
+            throw "compareLayout: Unrecognized writing-mode value";
+        }
+    }
+}
diff --git a/testing/web-platform/tests/mathml/support/mathml-fragments.js b/testing/web-platform/tests/mathml/support/mathml-fragments.js
new file mode 100644
index 0000000000..7e2113e95b
--- /dev/null
+++ b/testing/web-platform/tests/mathml/support/mathml-fragments.js
@@ -0,0 +1,189 @@
+var MathMLFragments = {
+    "annotation": "\
+<semantics>\
+  <mrow></mrow>\
+  <annotation class='element text-container'></annotation>\
+</semantics>",
+    "annotation-xml": "\
+<semantics>\
+  <mrow></mrow>\
+  <annotation-xml class='element text-container foreign-container'></annotation-xml>\
+</semantics>",
+    "maction": "\
+<maction class='element' actiontype='statusline'>\
+  <mrow class='mathml-container'></mrow>\
+  <mtext class='text-container'></mtext>\
+</maction>",
+    "menclose": "<menclose class='element mathml-container'></menclose>",
+    "merror": "<merror class='element mathml-container'></merror>",
+    "mfrac": "\
+<mfrac class='element'>\
+  <mrow class='mathml-container'></mrow>\
+  <mrow class='mathml-container'></mrow>\
+</mfrac>",
+    "mi": "<mi class='element text-container foreign-container'></mi>",
+    "mmultiscripts": "\
+<mmultiscripts class='element'>\
+  <mrow class='mathml-container'></mrow>\
+  <mrow class='mathml-container'></mrow>\
+  <mrow class='mathml-container'></mrow>\
+</mmultiscripts>",
+    "mn": "<mn class='element text-container foreign-container'></mn>",
+    "mo": "<mo class='element text-container foreign-container'></mo>",
+    "mover": "\
+<mover class='element'>\
+  <mrow class='mathml-container'></mrow>\
+  <mrow class='mathml-container'></mrow>\
+</mover>",
+    "mpadded": "<mpadded class='element mathml-container'></mpadded>",
+    "mphantom": "<mphantom class='element mathml-container'></mphantom>",
+    "mprescripts": "\
+<mmultiscripts>\
+  <mrow class='mathml-container'></mrow>\
+  <mprescripts class='element'/>\
+  <mrow class='mathml-container'></mrow>\
+  <mrow class='mathml-container'></mrow>\
+</mmultiscripts>",
+    "mroot": "\
+<mroot class='element'>\
+  <mrow class='mathml-container'></mrow>\
+  <mrow class='mathml-container'></mrow>\
+</mroot>",
+    "mrow": "<mrow class='element mathml-container'></mrow>",
+    "ms": "<ms class='element text-container foreign-container'></ms>",
+    "mspace": "<mspace class='element'></mspace>",
+    "msqrt": "<msqrt class='element mathml-container'></msqrt>",
+    "mstyle": "<mstyle class='element mathml-container'></mstyle>",
+    "msub": "\
+<msub class='element'>\
+  <mrow class='mathml-container'></mrow>\
+  <mrow class='mathml-container'></mrow>\
+</msub>",
+    "msubsup": "\
+<msubsup class='element'>\
+  <mrow class='mathml-container'></mrow>\
+  <mrow class='mathml-container'></mrow>\
+  <mrow class='mathml-container'></mrow>\
+</msubsup>",
+    "msup": "\
+<msup class='element'>\
+  <mrow class='mathml-container'></mrow>\
+  <mrow class='mathml-container'></mrow>\
+</msup>",
+    "mtable": "\
+<mtable class='element'>\
+  <mtr>\
+    <mtd class='mathml-container'>\
+    </mtd>\
+  </mtr>\
+</mtable>",
+    "mtd": "\
+<mtable>\
+  <mtr>\
+    <mtd class='element mathml-container'>\
+    </mtd>\
+  </mtr>\
+</mtable>",
+    "mtext": "<mtext class='element text-container foreign-container'></mtext>",
+    "mtr": "\
+<mtable>\
+  <mtr class='element'>\
+    <mtd class='mathml-container'>\
+    </mtd>\
+  </mtr>\
+</mtable>",
+    "munder": "\
+<munder class='element'>\
+  <mrow class='mathml-container'></mrow>\
+  <mrow class='mathml-container'></mrow>\
+</munder>",
+    "munderover": "\
+<munderover class='element'>\
+  <mrow class='mathml-container'></mrow>\
+  <mrow class='mathml-container'></mrow>\
+  <mrow class='mathml-container'></mrow>\
+</munderover>",
+    "none": "\
+<mmultiscripts>\
+  <mrow class='mathml-container'></mrow>\
+  <none class='element'/>\
+  <mrow class='mathml-container'></mrow>\
+</mmultiscripts>",
+    "semantics": "\
+<semantics class='element'>\
+  <mrow class='mathml-container'></mrow>\
+  <annotation class='text-container'></annotation>\
+</semantics>"
+};
+
+var FragmentHelper = {
+    mathml_namespace: "http://www.w3.org/1998/Math/MathML",
+
+    createElement: function(tag) {
+        return document.createElementNS(this.mathml_namespace, tag);
+    },
+
+    isValidChildOfMrow: function(tag) {
+        return !(tag == "annotation" ||
+                 tag == "annotation-xml" ||
+                 tag == "mprescripts" ||
+                 tag == "none" ||
+                 tag == "mtr" ||
+                 tag == "mtd");
+    },
+
+    isTokenElement: function(tag) {
+        return (tag == "mi" ||
+                tag == "mtext" ||
+                tag == "mo" ||
+                tag == "mn" ||
+                tag == "ms")
+    },
+
+    isEmpty: function(tag) {
+        return tag === "mspace" || tag == "mprescripts" || tag == "none";
+    },
+
+    element: function(fragment) {
+        return fragment.getElementsByClassName('element')[0];
+    },
+
+    appendChild: function(fragment, allowInvalid) {
+        var element = this.element(fragment) || fragment;
+        if (element.classList.contains("foreign-container")) {
+            var el = document.createElement("span");
+            el.textContent = "a";
+            return element.appendChild(el);
+        }
+        if (element.classList.contains("mathml-container") || allowInvalid) {
+            var el = this.createElement("mi");
+            el.textContent = "a";
+            return element.appendChild(el);
+        }
+        throw "Cannot append child to the element";
+    },
+
+    forceNonEmptyElement: function(fragment) {
+        var element = this.element(fragment) || fragment;
+        if (element.firstElementChild)
+            return element.firstElementChild;
+        return this.appendChild(fragment);
+    },
+
+    forceNonEmptyDescendants: function(fragment) {
+        var element = this.element(fragment) || fragment;
+        if (element.classList.contains("mathml-container") ||
+            element.classList.contains("foreign-container")) {
+            for (var i = 0; i < 10; i++)
+                this.appendChild(element);
+            return;
+        }
+        var child = element.firstElementChild;
+        if (child) {
+            for (; child; child = child.nextElementSibling) {
+                this.forceNonEmptyDescendants(child);
+            }
+            return;
+        }
+    },
+}
diff --git a/testing/web-platform/tests/mathml/support/operator-dictionary.js b/testing/web-platform/tests/mathml/support/operator-dictionary.js
new file mode 100644
index 0000000000..ee1de102fe
--- /dev/null
+++ b/testing/web-platform/tests/mathml/support/operator-dictionary.js
@@ -0,0 +1,42 @@
+async function fetchOperatorDictionary() {
+    let response = await fetch(`/mathml/support/operator-dictionary.json`);
+    return response.json();
+}
+
+function splitKey(key) {
+    var value = key.split(" ")
+    return {
+        characters: value[0],
+        form: value[1]
+    };
+}
+
+function spaceIndexToLength(index) {
+    // See https://w3c.github.io/mathml-core/#operator-dictionary
+    return ["0",
+            "0.05555555555555555em",
+            "0.1111111111111111em",
+            "0.16666666666666666em",
+            "0.2222222222222222em",
+            "0.2777777777777778em",
+            "0.3333333333333333em",
+            "0.3888888888888889em"
+           ][index];
+}
+
+function defaultPropertyValue(entry, name) {
+    switch (name) {
+    case "lspace":
+    case "rspace":
+        return spaceIndexToLength(entry.hasOwnProperty(name) ? entry[name] : 5);
+    break
+    case "largeop":
+    case "movablelimits":
+    case "stretchy":
+    case "symmetric":
+    case "accent":
+        return entry[name];
+    default:
+        throw `Unknown property ${name}`;
+    }
+}
diff --git a/testing/web-platform/tests/mathml/support/operator-dictionary.json b/testing/web-platform/tests/mathml/support/operator-dictionary.json
new file mode 100644
index 0000000000..0008f5114e
--- /dev/null
+++ b/testing/web-platform/tests/mathml/support/operator-dictionary.json
@@ -0,0 +1 @@
+{"comment": "This file was automatically generated by operator-dictionary.py. Do not edit.", "dictionary": {"! postfix": {"lspace": 0, "rspace": 0}, "! prefix": {"lspace": 0, "rspace": 0}, "!! postfix": {"lspace": 0, "rspace": 0}, "!= infix": {"lspace": 5, "rspace": 5}, "\" postfix": {"lspace": 0, "rspace": 0}, "% infix": {"lspace": 3, "rspace": 3}, "% postfix": {"lspace": 0, "rspace": 0}, "& postfix": {"lspace": 0, "rspace": 0}, "&& infix": {"lspace": 4, "rspace": 4}, "' postfix": {"lspace": 0, "rspace": 0}, "( prefix": {"lspace": 0, "rspace": 0, "stretchy": true, "symmetric": true}, ") postfix": {"lspace": 0, "rspace": 0, "stretchy": true, "symmetric": true}, "* infix": {"lspace": 3, "rspace": 3}, "** infix": {"lspace": 3, "rspace": 3}, "*= infix": {"lspace": 5, "rspace": 5}, "+ infix": {"lspace": 4, "rspace": 4}, "+ prefix": {"lspace": 0, "rspace": 0}, "++ postfix": {"lspace": 0, "rspace": 0}, "+= infix": {"lspace": 5, "rspace": 5}, ", infix": {"lspace": 0, "rspace": 3}, "- infix": {"lspace": 4, "rspace": 4}, "- prefix": {"lspace": 0, "rspace": 0}, "-- postfix": {"lspace": 0, "rspace": 0}, "-= infix": {"lspace": 5, "rspace": 5}, "-> infix": {"lspace": 5, "rspace": 5}, ". infix": {"lspace": 3, "rspace": 3}, "/ infix": {"lspace": 4, "rspace": 4}, "// infix": {"lspace": 5, "rspace": 5}, "/= infix": {"lspace": 5, "rspace": 5}, ": infix": {"lspace": 0, "rspace": 3}, ":= infix": {"lspace": 5, "rspace": 5}, "; infix": {"lspace": 0, "rspace": 3}, "< infix": {"lspace": 5, "rspace": 5}, "<= infix": {"lspace": 5, "rspace": 5}, "<> infix": {"lspace": 3, "rspace": 3}, "= infix": {"horizontal": true, "lspace": 5, "rspace": 5}, "== infix": {"lspace": 5, "rspace": 5}, "> infix": {"lspace": 5, "rspace": 5}, ">= infix": {"lspace": 5, "rspace": 5}, "? infix": {"lspace": 3, "rspace": 3}, "@ infix": {"lspace": 3, "rspace": 3}, "[ prefix": {"lspace": 0, "rspace": 0, "stretchy": true, "symmetric": true}, "\\ infix": {"lspace": 0, "rspace": 0}, "] postfix": {"lspace": 0, "rspace": 0, "stretchy": true, "symmetric": true}, "^ infix": {"horizontal": true, "lspace": 3, "rspace": 3}, "^ postfix": {"horizontal": true, "lspace": 0, "rspace": 0, "stretchy": true}, "_ infix": {"horizontal": true, "lspace": 0, "rspace": 0}, "_ postfix": {"horizontal": true, "lspace": 0, "rspace": 0, "stretchy": true}, "` postfix": {"lspace": 0, "rspace": 0}, "{ prefix": {"lspace": 0, "rspace": 0, "stretchy": true, "symmetric": true}, "| infix": {"lspace": 5, "rspace": 5}, "| postfix": {"lspace": 0, "rspace": 0, "stretchy": true, "symmetric": true}, "| prefix": {"lspace": 0, "rspace": 0, "stretchy": true, "symmetric": true}, "|| infix": {"lspace": 5, "rspace": 5}, "|| postfix": {"lspace": 0, "rspace": 0}, "|| prefix": {"lspace": 0, "rspace": 0}, "} postfix": {"lspace": 0, "rspace": 0, "stretchy": true, "symmetric": true}, "~ postfix": {"horizontal": true, "lspace": 0, "rspace": 0, "stretchy": true}, "\u00a0 infix": {}, "\u00a0 prefix": {}, "\u00a0 suffix": {}, "\u00a8 postfix": {"lspace": 0, "rspace": 0}, "\u00ac prefix": {"lspace": 0, "rspace": 0}, "\u00af postfix": {"horizontal": true, "lspace": 0, "rspace": 0, "stretchy": true}, "\u00b0 postfix": {"lspace": 0, "rspace": 0}, "\u00b1 infix": {"lspace": 4, "rspace": 4}, "\u00b1 prefix": {"lspace": 0, "rspace": 0}, "\u00b2 postfix": {"lspace": 0, "rspace": 0}, "\u00b3 postfix": {"lspace": 0, "rspace": 0}, "\u00b4 postfix": {"lspace": 0, "rspace": 0}, "\u00b7 infix": {"lspace": 3, "rspace": 3}, "\u00b8 postfix": {"lspace": 0, "rspace": 0}, "\u00b9 postfix": {"lspace": 0, "rspace": 0}, "\u00d7 infix": {"lspace": 3, "rspace": 3}, "\u00f7 infix": {"lspace": 4, "rspace": 4}, "\u02c6 postfix": {"horizontal": true, "lspace": 0, "rspace": 0, "stretchy": true}, "\u02c7 postfix": {"horizontal": true, "lspace": 0, "rspace": 0, "stretchy": true}, "\u02c9 postfix": {"horizontal": true, "lspace": 0, "rspace": 0, "stretchy": true}, "\u02ca postfix": {"lspace": 0, "rspace": 0}, "\u02cb postfix": {"lspace": 0, "rspace": 0}, "\u02cd postfix": {"horizontal": true, "lspace": 0, "rspace": 0, "stretchy": true}, "\u02d8 postfix": {"lspace": 0, "rspace": 0}, "\u02d9 postfix": {"lspace": 0, "rspace": 0}, "\u02da postfix": {"lspace": 0, "rspace": 0}, "\u02dc postfix": {"horizontal": true, "lspace": 0, "rspace": 0, "stretchy": true}, "\u02dd postfix": {"lspace": 0, "rspace": 0}, "\u02f7 postfix": {"horizontal": true, "lspace": 0, "rspace": 0, "stretchy": true}, "\u0302 postfix": {"horizontal": true, "lspace": 0, "rspace": 0, "stretchy": true}, "\u0311 postfix": {"lspace": 0, "rspace": 0}, "\u2016 postfix": {"lspace": 0, "rspace": 0, "stretchy": true, "symmetric": true}, "\u2016 prefix": {"lspace": 0, "rspace": 0, "stretchy": true, "symmetric": true}, "\u2018 prefix": {"lspace": 0, "rspace": 0}, "\u2019 postfix": {"lspace": 0, "rspace": 0}, "\u201a postfix": {"lspace": 0, "rspace": 0}, "\u201b postfix": {"lspace": 0, "rspace": 0}, "\u201c prefix": {"lspace": 0, "rspace": 0}, "\u201d postfix": {"lspace": 0, "rspace": 0}, "\u201e postfix": {"lspace": 0, "rspace": 0}, "\u201f postfix": {"lspace": 0, "rspace": 0}, "\u2022 infix": {"lspace": 3, "rspace": 3}, "\u2032 postfix": {"lspace": 0, "rspace": 0}, "\u2033 postfix": {"lspace": 0, "rspace": 0}, "\u2034 postfix": {"lspace": 0, "rspace": 0}, "\u2035 postfix": {"lspace": 0, "rspace": 0}, "\u2036 postfix": {"lspace": 0, "rspace": 0}, "\u2037 postfix": {"lspace": 0, "rspace": 0}, "\u203e postfix": {"horizontal": true, "lspace": 0, "rspace": 0, "stretchy": true}, "\u2043 infix": {"lspace": 3, "rspace": 3}, "\u2044 infix": {"lspace": 4, "rspace": 4}, "\u2057 postfix": {"lspace": 0, "rspace": 0}, "\u2061 infix": {"lspace": 0, "rspace": 0}, "\u2062 infix": {"lspace": 0, "rspace": 0}, "\u2063 infix": {"lspace": 0, "rspace": 0}, "\u2064 infix": {"lspace": 0, "rspace": 0}, "\u20db postfix": {"lspace": 0, "rspace": 0}, "\u20dc postfix": {"lspace": 0, "rspace": 0}, "\u2145 prefix": {"lspace": 3, "rspace": 0}, "\u2146 prefix": {"lspace": 3, "rspace": 0}, "\u2190 infix": {"horizontal": true, "lspace": 5, "rspace": 5, "stretchy": true}, "\u2191 infix": {"lspace": 5, "rspace": 5, "stretchy": true}, "\u2192 infix": {"horizontal": true, "lspace": 5, "rspace": 5, "stretchy": true}, "\u2193 infix": {"lspace": 5, "rspace": 5, "stretchy": true}, "\u2194 infix": {"horizontal": true, "lspace": 5, "rspace": 5, "stretchy": true}, "\u2195 infix": {"lspace": 5, "rspace": 5, "stretchy": true}, "\u2196 infix": {"lspace": 5, "rspace": 5}, "\u2197 infix": {"lspace": 5, "rspace": 5}, "\u2198 infix": {"horizontal": true, "lspace": 5, "rspace": 5}, "\u2199 infix": {"horizontal": true, "lspace": 5, "rspace": 5}, "\u219a infix": {"horizontal": true, "lspace": 5, "rspace": 5, "stretchy": true}, "\u219b infix": {"horizontal": true, "lspace": 5, "rspace": 5, "stretchy": true}, "\u219c infix": {"horizontal": true, "lspace": 5, "rspace": 5, "stretchy": true}, "\u219d infix": {"horizontal": true, "lspace": 5, "rspace": 5, "stretchy": true}, "\u219e infix": {"horizontal": true, "lspace": 5, "rspace": 5, "stretchy": true}, "\u219f infix": {"lspace": 5, 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\ No newline at end of file