LibWeb/HTML: Implement TextTrackCueList idl interface

Author: https://github.com/jamierocks
Commit: cfec88feb3
Pull-request: https://github.com/LadybirdBrowser/ladybird/pull/1494
Reviewed-by: https://github.com/AtkinsSJ
Reviewed-by: https://github.com/tcl3 ✅

Userland/Libraries/LibWeb/HTML/TextTrackCueList.idl

@@ -0,0 +1,9 @@
+#import <HTML/TextTrackCue.idl>
+
+// https://html.spec.whatwg.org/multipage/media.html#texttrackcuelist
+[Exposed=Window]
+interface TextTrackCueList {
+    readonly attribute unsigned long length;
+    getter TextTrackCue (unsigned long index);
+    TextTrackCue? getCueById(DOMString id);
+};