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Is there a plugin for firefox to validate HTML 5? I've always used this but if my webpage has a <!DOCTYPE HTML> doctype it complains about it not having a doctype at all.

I specifically would like one similar to the one I linked, where the verification happens on your computer and instantaneous and automatic, without needing to send any data to a 3rd party server and then wait for a reply.

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4 Answers 4

This is the best one I found so far:

https://github.com/rogerjohansson/html5validator (see Downloads for an xpi)

You should not use the validator.nu online service with it, since it causes a DOS on the online service and you will probably be banned from using the service as a counter measure(see https://github.com/rogerjohansson/html5validator/issues/6 ). The cool thing is, it does not send the URL to the validator, but the HTML data directly; this means that local sites or password-protected sites can also be checked.

Validation can be turned on automatically, by a domain-whitelist or by clicking the validator item.

You can and should up your own validator.nu-instance (at least on Linux and Mac OS X) - see this. You would then have a locally-running validator and can even check sites without an Internet connection by filling in http://localhost:8888/ (the default address of the local validator instance) into the Validator URL of the addon.

To give credits: I have the information above from

http://www.456bereastreet.com/archive/201102/validating_html5_with_validatornu_and_the_html5validator_extension_for_firefox/

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On the Web Developer add-on: https://addons.mozilla.org/en-US/firefox/addon/60 , if you use "Tools" > "Display Page Validation" it will show a bar at the top validating the page source code. This is done via the w3c validator, but without you having to navigate there.

Shame the HTML Validator has no plans as of yet to incorporate HTML5 until at-least version 0.9

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This says it will do it: https://addons.mozilla.org/en-US/firefox/addon/2318 and I found this also: http://html5.validator.nu/

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The problem with the first is that it requires me to click the icon to validate. I want it to automatically validate every page I visit so that I realize immediately if my website doesn't validate, like HTML Validator does. The second is web-based, there is an "official" one at the W3C website too. –  Andreas Bonini Feb 10 '10 at 19:36

You can validate HTML5 at the following site:

http://validator.w3.org/

Make sure on the options that you select the HTML5 document type.

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