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This bookmarklet analyses the displayed page's HTML source and detects violations of the coding standard. It offers a huge amount of predefined rules and can be extended with custom rules.


Go to HTML_CodeSniffer and get the bookmarklet there.


Activate the bookmarklet by clicking on it. Then inspect the displayed results.

HTML_CodeSniffer in action

Discretion advised

In general, be careful with the displayed results. Automated test tools are very limited and tend to display both false-positive as well as false-negative results.