LayoutTests/fast/forms/HTMLOptionElement_label03.html - WebKit - Git at Google

 <!DOCTYPE html>
 <!-- Even though the label is nothing but whitespace, it exists, so it it used. -->
 <body>
     <select>
         <option label=" ">white space label should display empty string</option>
     </select>
 </body>
	<!DOCTYPE html>
	<!-- Even though the label is nothing but whitespace, it exists, so it it used. -->
	<body>
	<select>
	<option label=" ">white space label should display empty string</option>
	</select>
	</body>