LibWeb: Implement the HTMLMediaElement currentSrc attribute

Author: https://github.com/trflynn89
Commit: 1a67b86b76
Pull-request: https://github.com/SerenityOS/serenity/pull/18431

Userland/Libraries/LibWeb/HTML/HTMLMediaElement.h

@@ -33,6 +33,8 @@ public:
 
     void queue_a_media_element_task(JS::SafeFunction<void()> steps);
 
+    String const& current_src() const { return m_current_src; }
+
     enum class NetworkState : u16 {
         Empty,
         Idle,
@@ -142,6 +144,9 @@ private:
     // https://html.spec.whatwg.org/multipage/media.html#dom-media-crossorigin
     CORSSettingAttribute m_crossorigin { CORSSettingAttribute::NoCORS };
 
+    // https://html.spec.whatwg.org/multipage/media.html#dom-media-currentsrc
+    String m_current_src;
+
     // https://html.spec.whatwg.org/multipage/media.html#dom-media-networkstate
     NetworkState m_network_state { NetworkState::Empty };