Accordion details, toggle switches, styleable selects, responsive video, and more!

HTML attributes are like little instructions that we add to the markup of elements to make them do certain things or behave in certain ways. For example, most of us know that the `target` attribute with a value of `_blank` opens the link in a new tab or window. But did you know that you can use it on the `form` element, too? John Rhea presents several lesser-known uses for common HTML attributes.

In this article, Louis Lazaris describes and demonstrates some interesting HTML attributes that you may or may not have heard of and perhaps find useful enough to personally use in one of your projects.

'Can I Include' tool to help determine if one HTML tag can be included in another HTML tag

The semantics you didn't know you needed.

HTML semantic brings meaning to the code we write. Previously when there was no semantic HTML, the elements lacked meaning to what they do.

Complete list of all HTML entities with their name and numbers

Pavels Jelisejevs takes a look at the W3C recommendation for HTML 5.1, looking at its major new features with some markup samples.