1 files changed, 25 insertions, 0 deletions
diff --git a/testing/web-platform/tests/user-timing/case-sensitivity.any.js b/testing/web-platform/tests/user-timing/case-sensitivity.any.js
new file mode 100644
index 0000000000..1c0b0dcac3
--- /dev/null
+++ b/testing/web-platform/tests/user-timing/case-sensitivity.any.js
@@ -0,0 +1,25 @@
+  test(function () {
+    assert_equals(typeof self.performance, "object");
+    assert_equals(typeof self.performance.getEntriesByType, "function");
+
+    self.performance.mark("mark1");
+    self.performance.measure("measure1");
+
+    const type = [
+      'mark',
+      'measure',
+    ];
+    type.forEach(function(entryType) {
+      if (PerformanceObserver.supportedEntryTypes.includes(entryType)) {
+        const entryTypeUpperCased = entryType.toUpperCase();
+        const entryTypeCapitalized = entryType[0].toUpperCase() + entryType.substring(1);
+        const lowerList = self.performance.getEntriesByType(entryType);
+        const upperList = self.performance.getEntriesByType(entryTypeUpperCased);
+        const mixedList = self.performance.getEntriesByType(entryTypeCapitalized);
+
+        assert_greater_than(lowerList.length, 0, "Entries exist");
+        assert_equals(upperList.length, 0, "getEntriesByType('" + entryTypeCapitalized + "').length");
+        assert_equals(mixedList.length, 0, "getEntriesByType('" + entryTypeCapitalized + "').length");
+      }
+    });
+  }, "getEntriesByType values are case sensitive");