1 files changed, 86 insertions, 0 deletions
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;
+    },
+});