HTMLValidator is a Mac OS X app that validates the structure of web pages against the html standards.
Making your webpages compliant with the standards means that your pages will work more reliably. Correctly written webpages are also a key step towards making your sites accessible for everyone.
HTMLValidator makes validation simple, reliable and repeatable. And it works without connecting to the internet, which means your pages and content don't escape from your network (until you want them to, of course).
The 1.2 release has been updated for 10.7/Lion.
Users of HTMLValidator 1.2 are recommended to upgrade to version 1.2.3 which fixes a perl version issue and offers better update support.
To do this please download the updated version listed (right).
The automatic update system cannot upgrade 1.2.x to 1.2.3
Version 1.2.3 should be able to upgrade itself to the next version
The current release cannot verify html5, instead a notice will be displayed warning you that it cannot be verified. We thought this to be better than trying to parse as something else and giving you incorrect warnings.
HTML5 support is being developed for a future release, however we don't have a timescale for this yet.
If you need help using HTMLValidator visit the HTMLValidator Support Page
Learn more about HTMLValidator in our regular blog.
There is a blog post about HTMLValidator
We're always interested in improving HTMLValidator so please feel free to send in any ideas or suggestions (or bug reports if necessary)