A lot of times you’ll take extra care to make sure a theme’s markup is valid and clean as possible, only to have it rendered invalid by a content management system’s WYSIWYG input. If you’re using WordPress, you can overcome this problem with a snippet by Matt Varone. Just add this to your functions.php file [...]
My most-used and possibly favorite plugin has been updated to work with Firefox 5.0 on OS X. HTML Validator by Mark Gueury is a free utility that lets you know at-a-glance when something is valid or not. It can quickly determine the quality of markup and it’s a great first-step to take when troubleshooting cross-browser [...]