editing/crashtests/selection-modify-extend-backward-character-to-outside-body-in-designMode.html - external/github.com/web-platform-tests/wpt - Git at Google

 <!DOCTYPE html>
 <meta charset="utf-8">
 <script>
 onload = () => {
   document.designMode = 'on';
   getSelection().selectAllChildren(document.body);
   getSelection().modify('extend', 'backward', 'character');
 };
 </script>
 <audio controls>
	<!DOCTYPE html>
	<meta charset="utf-8">
	<script>
	onload = () => {
	document.designMode = 'on';
	getSelection().selectAllChildren(document.body);
	getSelection().modify('extend', 'backward', 'character');
	};
	</script>
	<audio controls>