LayoutTests/editing/pasteboard/drag-end-crash-accessing-item-list.html - WebKit - Git at Google

 <!DOCTYPE html>
 <body>
     <div draggable="true" style="width: 200px; height: 200px" id="source">DRAG ME AND LET GO</div>
 </body>
 <script>
 function forceGarbageCollection() {
     if (window.GCController)
         GCController.collect();
     else {
         for (let i = 0; i < 1000; i++)
             new ArrayBuffer(0x100000);
     }
 }

 source.addEventListener("dragend", event => {
     forceGarbageCollection();
     event.dataTransfer.items.clear();
     if (window.testRunner)
         testRunner.notifyDone();
 });

 source.addEventListener("dragstart", event => {
     event.dataTransfer.items.add(event.target.id, "text/plain");
     event.dataTransfer.items.add("Test1", "text/html");
     event.dataTransfer.items.add("Test2", "text/uri-list");
 });

 if (window.testRunner && window.eventSender && window.internals) {
     internals.settings.setCustomPasteboardDataEnabled(true);
     testRunner.waitUntilDone();
     testRunner.dumpAsText();
     eventSender.mouseMoveTo(100, 100);
     eventSender.mouseDown();
     eventSender.leapForward(1000);
     eventSender.mouseMoveTo(400, 400);
     eventSender.mouseUp();
 }
 </script>
	<!DOCTYPE html>
	<body>
	<div draggable="true" style="width: 200px; height: 200px" id="source">DRAG ME AND LET GO</div>
	</body>
	<script>
	function forceGarbageCollection() {
	if (window.GCController)
	GCController.collect();
	else {
	for (let i = 0; i < 1000; i++)
	new ArrayBuffer(0x100000);
	}
	}

	source.addEventListener("dragend", event => {
	forceGarbageCollection();
	event.dataTransfer.items.clear();
	if (window.testRunner)
	testRunner.notifyDone();
	});

	source.addEventListener("dragstart", event => {
	event.dataTransfer.items.add(event.target.id, "text/plain");
	event.dataTransfer.items.add("Test1", "text/html");
	event.dataTransfer.items.add("Test2", "text/uri-list");
	});

	if (window.testRunner && window.eventSender && window.internals) {
	internals.settings.setCustomPasteboardDataEnabled(true);
	testRunner.waitUntilDone();
	testRunner.dumpAsText();
	eventSender.mouseMoveTo(100, 100);
	eventSender.mouseDown();
	eventSender.leapForward(1000);
	eventSender.mouseMoveTo(400, 400);
	eventSender.mouseUp();
	}
	</script>