Maintaining the Wordpress blog valid to the declared HTML standard seems to be not very easy if many plug-ins are used. In fact, every plug-in contributes a piece of code to the page and sometimes breaks the HTML validity. Since plug-ins can be upgraded by a simple click in the dashboard, an error can be simply delivered and installed to your Blog. Thus, a re-check in a HML Validator of your choice is desireable after every new plugin upgrade. I prefer to use W3C Validator for checks.

Apparently, I realized running my monthly seitwert-check, that the one of my pages got errors because of one of the plug-in installed. This time it was Google Syntax Highlighter for WordPress by Peter Ryan. Instead of using the type="text/javascript" inside of script-tag, the class="javascript" is used. The bug could be easily fixed locally by replacing the corresponding pieces of code. Peter seems to be not interested anymore in maintaining the plug-in, since there is a long list of comments claiming and voting for the bug.

Especially, if you think of the fact, that the usage of invalid (X)HTML effects your page rank by search engines and other directories in a very negative way, such hidden standards violations should be avoided.