src/third_party/web_platform_tests/conformance-checkers/html/elements/iframe/src-whitespace-only-novalid.html - cobalt - Git at Google

 <!DOCTYPE html>
 <meta charset=utf-8>
 <title>empty src is not valid</title>
 <iframe src="
 "></iframe>
	<!DOCTYPE html>
	<meta charset=utf-8>
	<title>empty src is not valid</title>
	<iframe src="
	"></iframe>