third_party/WebKit/Source/web/tests/data/viewport-lengths.html - chromium/src - Git at Google

 <!DOCTYPE html>
 <style>
     @viewport {
         width: 50vw;
         height: 50vh;
     }
 </style>
	<!DOCTYPE html>
	<style>
	@viewport {
	width: 50vw;
	height: 50vh;
	}
	</style>