third_party/blink/web_tests/editing/selection/iframe-select-expected.html - chromium/src - Git at Google

 <!DOCTYPE html>
 <img src="../../css2.1/support/1x1-transparent.png" id="target" style="width: 100px; height: 100px; position: absolute; top: 50px; left: 50px"/>
 <script>
     var selection = getSelection();

     selection.setBaseAndExtent(document.querySelector("#target"), 0, document.querySelector("#target"), 1);
 </script>
	<!DOCTYPE html>
	<img src="../../css2.1/support/1x1-transparent.png" id="target" style="width: 100px; height: 100px; position: absolute; top: 50px; left: 50px"/>
	<script>
	var selection = getSelection();

	selection.setBaseAndExtent(document.querySelector("#target"), 0, document.querySelector("#target"), 1);
	</script>