1 files changed, 31 insertions, 0 deletions
diff --git a/tests/wpt/web-platform-tests/mathml/support/attribute-values.js b/tests/wpt/web-platform-tests/mathml/support/attribute-values.js
new file mode 100644
index 00000000000..8408124f49a
--- /dev/null
+++ b/tests/wpt/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);
+        });
+    });
+}