HTML and CSS Reference
of this topic have stretched the definition of HTML5 to include several “unofficial” tech-
A.2. Popular HTML5 specifications
In this section, we'll discuss the technologies that are part of WHATWG's HTML Living
Standard and the HTML5 family of specifications at W3C. Although the WHATWG spec
hasn't always been called the HTML Living Standard, we'll use that term to differentiate it
from the HTML5 spec at W3C. Each section will mention which specification at the W3C
applies and the relevant chapter or chapters in this topic.
A.2.1. Semantic markup, forms
HTML5 introduces HTML elements that change how people structure website markup and
use form elements. It also gives programmers more control over their markup through at-
tributes such as data . These attributes can hold important metadata inside an HTML ele-
ment. This is all core HTML stuff and so is in the W3C HTML5 specification.
A.2.2. Video and sound (multimedia)
In the past, web developers have primarily relied on Flash or another plug-in to provide au-
dio and video support. The HTML5 audio and video elements allow a browser to run both,
without any additional configuration. Both use the Media Element API, which means their
event systems for toggling playback, sound, stopping, and so on are similar. This is also in
the core W3C HTML5 specification.
cutting-edge video technologies.