chromium/src/third_party/blink/web_tests/fast/replaced/no-focus-ring-iframe.html - manifest_repos/chromium_src - Git at Google

 <!DOCTYPE html>
 <style>
   #test { border: 20px solid orange; background-color: blue }
 </style>

 <iframe id="test" tabIndex="1" src="resources/square-blue-100x100.png"></iframe><br>
 Click the orange border, a focus ring should not appear.

 <script src="resources/focus-test.js"></script>
	<!DOCTYPE html>
	<style>
	#test { border: 20px solid orange; background-color: blue }
	</style>

	<iframe id="test" tabIndex="1" src="resources/square-blue-100x100.png"></iframe><br>
	Click the orange border, a focus ring should not appear.

	<script src="resources/focus-test.js"></script>