Mort posted a link to a very handy little firefox addon.
Based on Tidy (which I mentioned recently) the extension checks sites for valid HTML as you browse.
If there are any errors or warnings an icon in the corner subtly alerts you to them. Double-clicking on the icon brings up a screen with a lot more detail.
It’s a very nice little addition, though I don’t understand why the developer hasn’t put it in the official firefox extensions’ repository.







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