servo · bors-servo · Jun 4, 2020 · May 10, 2020
diff --git a/components/script/dom/eventtarget.rs b/components/script/dom/eventtarget.rs
@@ -495,7 +495,7 @@ impl EventTarget {
         // Step 3.9
 
         let url_serialized = CString::new(handler.url.to_string()).unwrap();
-        let name = CString::new(&**ty).unwrap();
+        let name = CString::new(format!("on{}", &**ty)).unwrap();
 
         // Step 3.9, subsection ParameterList
         static mut ARG_NAMES: [*const c_char; 1] = [b"event\0" as *const u8 as *const c_char];

diff --git a/...t/metadata-layout-2020/html/webappapis/scripting/events/event-handler-sourcetext.html.ini b/...t/metadata-layout-2020/html/webappapis/scripting/events/event-handler-sourcetext.html.ini
diff --git a/tests/wpt/metadata/html/webappapis/scripting/events/event-handler-sourcetext.html.ini b/tests/wpt/metadata/html/webappapis/scripting/events/event-handler-sourcetext.html.ini