Add AX TC for output element

content/browser/accessibility/dump_accessibility_tree_browsertest.cc

Index: content/browser/accessibility/dump_accessibility_tree_browsertest.cc
diff --git a/content/browser/accessibility/dump_accessibility_tree_browsertest.cc b/content/browser/accessibility/dump_accessibility_tree_browsertest.cc
index d940b4c5d42244a6fe3495e6d31e388ae104c3a1..57317ecda2bced7a65eef656669c705d3f33d75a 100644
--- a/content/browser/accessibility/dump_accessibility_tree_browsertest.cc
+++ b/content/browser/accessibility/dump_accessibility_tree_browsertest.cc
@@ -796,6 +796,10 @@ IN_PROC_BROWSER_TEST_F(DumpAccessibilityTreeTest,
   RunTest(FILE_PATH_LITERAL("option-in-datalist.html"));
 }
 
+IN_PROC_BROWSER_TEST_F(DumpAccessibilityTreeTest, AccessibilityOutput) {
+  RunTest(FILE_PATH_LITERAL("output.html"));
+}
+
 IN_PROC_BROWSER_TEST_F(DumpAccessibilityTreeTest, AccessibilityP) {
   RunTest(FILE_PATH_LITERAL("p.html"));
 }