Auto merge of #24144 - stephenmuss:event-src-element, r=jdm

Event src element

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This builds on top of the work done in https://github.com/servo/servo/pull/22918

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- [X] `./mach build -d` does not report any errors
- [X] `./mach test-tidy` does not report any errors
- [X] These changes fix #22880
- [X] There are tests for these changes
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2 files changed, 6 insertions, 0 deletions

diff --git a/components/script/dom/event.rs b/components/script/dom/event.rs
index a14beccabe3..52c9af3b061 100644
--- a/components/script/dom/event.rs
+++ b/components/script/dom/event.rs
@@ -263,6 +263,11 @@ impl EventMethods for Event {
         self.target.get()
     }
 
+    // https://dom.spec.whatwg.org/#dom-event-srcelement
+    fn GetSrcElement(&self) -> Option<DomRoot<EventTarget>> {
+        self.target.get()
+    }
+
     // https://dom.spec.whatwg.org/#dom-event-currenttarget
     fn GetCurrentTarget(&self) -> Option<DomRoot<EventTarget>> {
         self.current_target.get()
diff --git a/components/script/dom/webidls/Event.webidl b/components/script/dom/webidls/Event.webidl
index c688daedb2e..f3d281813a1 100644
--- a/components/script/dom/webidls/Event.webidl
+++ b/components/script/dom/webidls/Event.webidl
@@ -11,6 +11,7 @@ interface Event {
   [Pure]
   readonly attribute DOMString type;
   readonly attribute EventTarget? target;
+  readonly attribute EventTarget? srcElement;
   readonly attribute EventTarget? currentTarget;
 
   const unsigned short NONE = 0;