1 files changed, 26 insertions, 0 deletions
diff --git a/testing/web-platform/tests/user-timing/clear_non_existent_mark.any.js b/testing/web-platform/tests/user-timing/clear_non_existent_mark.any.js
new file mode 100644
index 0000000000..c7d8b47861
--- /dev/null
+++ b/testing/web-platform/tests/user-timing/clear_non_existent_mark.any.js
@@ -0,0 +1,26 @@
+test(function() {
+    self.performance.mark("mark1");
+    self.performance.mark("mark2");
+
+    // test that two marks have been created
+    var entries = self.performance.getEntriesByType("mark");
+    assert_equals(entries.length, 2, "Two marks have been created for this test.");
+
+    // clear non-existent mark
+    self.performance.clearMarks("mark3");
+
+    // test that "mark1" still exists
+    entries = self.performance.getEntriesByName("mark1");
+    assert_equals(entries[0].name, "mark1",
+              "After a call to self.performance.clearMarks(\"mark3\"), where \"mark3" +
+              "\" is a non-existent mark, self.performance.getEntriesByName(\"mark1\") " +
+              "returns an object containing the \"mark1\" mark.");
+
+    // test that "mark2" still exists
+    entries = self.performance.getEntriesByName("mark2");
+    assert_equals(entries[0].name, "mark2",
+              "After a call to self.performance.clearMarks(\"mark3\"), where \"mark3" +
+              "\" is a non-existent mark, self.performance.getEntriesByName(\"mark2\") " +
+              "returns an object containing the \"mark2\" mark.");
+
+}, "Clearing a non-existent mark doesn't affect existing marks");