Codebase Browser
chromium
Go to App

chromium/third_party/blink/web_tests/external/wpt/html/editing/dnd/canvas/010.xhtml 

<?xml version="1.0" encoding="utf-8"?>
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>Drag and drop between frames: dropping block element onto canvas</title>
</head>
<frameset rows="50%, 50%">
<frame src="010-1.xhtml"/>
<frame src="helper-drop-here-canvas.xhtml"/>
</frameset>
</html>