Of all the hats JavaScript can wear, its form-processing features are among the most sought and used. Learn how to use JavaScript for form processing, validation, and more.

Using semantic HTML (elements that clearly describe their meaning in both a human and machine-readable way) further enhances your content’s clarity and accessibility and can help your SEO strategy.

These are still the strongest use cases for HTML sitemaps, just like in the ‘90s, way before Google started using links for indexing and ranking and long before XML sitemaps were introduced.

The HTML needed to handle this can be found at Video for Everybody, an open source project to support Web-based video using no JavaScript and no browser sniffing. Semantically speaking.

The new HTML5 placeholder attribute lets the browser show an invitation to enter a new message. If you have already entered notes, the area on the right displays a map section of Google Maps.

Don't wait for the Flash-iPhone war to end: InfoWorld's hands-on guide tells you how to get your websites ready for HTML5 now ...