<!DOCTYPE html>
<html>
 <head>
  <title>Longdesc test:  External image, data: URI description surrounded by spaces</title>
 </head>
 <body>
  <img src="picture.png" alt="the image" longdesc="  data:text/html;charset=utf-8,%3C%21DOCTYPE%20html%3E%0D%0A%3Chtml%3E%0D%0A%20%3Chead%3E%0D%0A%20%20%3Ctitle%3ELongdesc%20test%20Pass%20page%3C%2Ftitle%3E%0D%0A%20%3C%2Fhead%3E%0D%0A%20%3Cbody%3E%0D%0A%20%20%3Ch1%3EPass%3C%2Fh1%3E%0D%0A%20%3C%2Fbody%3E%0D%0A%3C%2Fhtml%3E  ">
 </body>
</html>