install/mod_pagespeed_test/css_minify_calc_function_value_zero.html - incubator-pagespeed-mod - Git at Google

 <html>
   <head>
      <style property="stylesheet">@font-face{width: calc(50ex - 0px)}</style>
   </head>
 </html>
	<html>
	<head>
	<style property="stylesheet">@font-face{width: calc(50ex - 0px)}</style>
	</head>
	</html>