Collapse whitespace
HTMLRemoves redundant whitespace from the HTML.
Filter
collapse_whitespace
· Filter docs
A mod_pagespeed 1.15 filter. ModPageSpeed 2.0 applies it as part of one always-on pipeline, not as a separate switch.
Both frames render identically — that's the goal. The win is in the bytes and requests
below, not the look. They're served live by mod_pagespeed 1.15 on
demo-httpd-1.1.modpagespeed.com; the optimized frame
applies only this filter. Right after a cache purge it may briefly match the original while
the worker rewrites it — reload to see the result.
Measured impact
HTML size
What changed in the source
The page's HTML, before and after this filter. Red lines are removed, green lines are added.
<html>
-
- <head>
- <title>collapse_whitespace example </title>
- <script> var x = 'Hello, world!';</script>
- </head>
-
- <body>
- Whitespace is collapsed
-
- in general.
- <pre>
+ <head>
+ <title>collapse_whitespace example </title>
+ <script> var x = 'Hello, world!';</script>
+ </head>
+ <body>
+ Whitespace is collapsed
+ in general.
+ <pre>
But not in a
<pre> tag.
</pre>
- </body>
-
+ </body>
</html>
Run this on your own site
This is one of 47 filters mod_pagespeed 1.15 applies in place — self-hosted on
Apache, nginx, and IIS. Install and run it: it optimizes right away and adds an
X-PageSpeed-Warn: unlicensed header until you license it. A
commercial license is required for production use.