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A module filter.

Elide attributes

HTML

Removes attributes whose value is the browser default.

Filter elide_attributes · Filter docs · Read the full guide

Original Open in new tab
Optimized Open in new tab

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 the mod_pagespeed module 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

original
193 B
optimized
182 B

−11 B −6% in size

Measured on the demo stack, August 2026.

What changed in the source

The page's HTML, before and after this filter. Red lines are removed, green lines are added. 

                
                  

                      … 3 unchanged lines …
                    

                          </head>
                    

                          <body>
                    

                            Here is a disabled button:
                    

                      -       <button name="ok" disabled="disabled">button</button><br/>
                    

                      +       <button name="ok" disabled>button</button><br/>
                    

                          </body>
                    

                        </html>

Run this on your own site

This is one of 49 filters the mod_pagespeed module applies in place — self-hosted on Apache, nginx, and IIS. Install and run it: it optimizes right away and adds the optimized response headers shown above. Open source under the Apache License 2.0 — free in development and in production.

Download & run
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