W3C has deprecated many of the HTML tags and attributes that function as visual layout tools, advising that style sheets be used for this purpose instead.
Providing alternative text for visual content
the "alt" attributes are required with <img> and <area> elements.
the new "title" attribute gives a short description (tool-tip) for an image.
the new "longdesc" attribute (or d-links) designates an external document that gives a long description of an image.
the new <caption> element and "summary" attribute (with the table element) describe a table's purpose.
the new <abbr> and <acronym> elements and <lang> provide instructions to screen readers for speaking Web pages.
the new <object> element (for including images, applets, or any type of object) allows for specifying alternate content
Providing easier navigation
Use the "title" attributes with <a> to provide an alternative text as to where the anchor links to.
Use the "accesskey" attribute to allow users to activate links or form controls from the keyboard.
Use the "tabindex" attribute to allow users to use the keyboard to navigate the links or form controls on a page in a logical sequence.
Tables
Use structural markup with tables <caption>, <thead>, <tbody>, <tfoot>, <colgroup>, and <col> to allow selective browsing and speaking of tables
