HTML and CSS Reference
extra semantic information to elements. In this section, you'll learn
about new HTML5 global attributes from three major categories:
Accessibility for Rich Internet Applications (ARIA) , for providing
extra data to accessibility tools
Data-* attributes, for providing extra data for scripts on your page
Microdata attributes, for providing extra data to browsers and
scripts on other sites
Accessibility with ARIA
ARIA is a standard developed at the W3C in response to the generally
poor accessibility of early AJAX -based web applications.
Notifying users of AJAX updates isn't the only benefit ARIA can pro-
vide. ARIA consists of a set of attributes and values that can describe to
assistive technology the roles of various page elements and their status.
In other words, they add semantic value to HTML elements so you can