An Protokollen und Sprachen kann Firefox etwa mit HTML5, CSS.
This is done via the W3C validator, but without you having to navigate there. Mozilla Firefox can be customized to a large degree apart from its addon/extension support. On the Web Developer add-on,, if you use "Tools" > "Display Page Validation" it will show a bar at the top validating the page source code. To give credits: I have the information above from Validating HTML5 with validator.nu and the HTML5Validator Extension for Firefox.
#Html5 plugin for firefox how to#
This article explains which media formats you can play and how to control, save, and open them. You would then have a locally-running validator and can even check sites without an Internet connection by filling in (the default address of the local validator instance) into the Validator URL of the addon. HTML5 audio and video in Firefox Firefox handles many types of audio and video content on web pages. You can and should up your own validator.nu-instance (at least on Linux and Mac OS X) - see this. Validation can be turned on automatically, by a domain-whitelist or by clicking the validator item. 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. You should not use the validator.nu online service with it, since it causes a DoS attack on the online service, and you will probably be banned from using the service as a countermeasure (see ).
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