A HTML validator for Firefox
The best Firefox extension I have ever downloaded is the HTML Validator, based on Tidy, the extension puts an icon at the foot of the browser, checking for each page whether it is or not a valid HTML or XHML.
- If the icon is green (first picture), no validation error, thus the page is valid.
- If the icon is yellow (second picture), you need to fix some some warnings: missing tags, incorrect syntax, etc.
- If the icon is red (third picture), you have some HTML violations à la Microsoft, the mostly proprietary tags (eg. Word or Frontpage generated document).
To locate errors or warnings with reasons, you just have to display source (Ctrl+U), the warnings will be highlighted with blue whereas the errors are highlighted with red.
