Tabindex and Keyboard Focus

• HTM4 tabindex requirements
• HTML focus and tabindex requirements.
• Actively define visual focus style, since the default browser visual focus styling of focus is typically hard to discern and varies between browsers.

Tabindex Values

Value	Description
-1	Support keyboard focus/blur events. Not included in the tab order of the page.
0	Support keyboard focus/blur events. Included in the tab order of the page.
> 0	Support keyboard focus/blur events. Defines the tab order of the page. Note: This technique is not recommended due to browser incompatibilities and unpredictable focus behaviors.