Mirrored documentation

This page is a faithful mirror of the original Apache mod_pagespeed documentation (Apache License 2.0). The upstream project was retired and the modpagespeed.com domain is now operated by an unrelated commercial vendor; we host the original reference so users of nginx-module-pagespeed from GetPageSpeed can rely on a stable copy.

Pedantic

Configuration

The 'Pedantic' filter is enabled by specifying:

Apache:

ModPagespeedEnableFilters pedantic

Nginx:

pagespeed EnableFilters pedantic;

in the configuration file.

Description

The 'Pedantic' filter is used to make PageSpeed more HTML4 compliant. Some filters remove type attributes in style and script tags, which are required for HTML4 validation checks but not HTML5. This filter adds default types to script and style tags. Note that it will increase HTML size and thus possibly increase latency so use it only if you require HTML4 validation.

Operation

There are two cases where a type attribute can be added. First, if a <style> tag does not have a type attribute then a type="text/css" attribute will be added to the style tag. Second, if a <script> tag does not have a type attribute then a type="text/javascript" attribute will be added to the script tag.

The expected method of using the pedantic filter is via a query parameter such as: '?ModPagespeedFilters=+pedantic'.

You can see the filter in action at www.modpagespeed.com on this example.

Requirements

The 'Pedantic' filter will not alter a page with an HTML5 DOCTYPE.

Risks

This filter is considered medium risk. It is safe for most pages, but could possibly break scripts by adding text/javascript to a tag if the default mime type is something other than text/javascript.