HTML5 Browser Support

Browser vendors continue to implement HTML5 features. The source for tracking browser support of HTML5, CSS3, and related features is Can I Use. I recommend that be your first stop. The following sites also provide helpful charts regarding browser support:

• FindmebyIP - Web Designer's Checklist:
  Scroll down the page to see browser support tables for HTML5 web applications, embedded content, audio codecs, video codecs, and form inputs and attributes. Hasn't been updated to include Safari 5 yet.
• FindmebyIP - Your Browser's Support:
  Select the "HTML5" button or scroll down for simplified information about what your current browser supports.
• Wikipedia - Comparison of Layout Engines:
  Contains tables listing browser support for HTML5 elements, attributes, APIs, related specifications, and more.