Using Native HTML 3.2 Elements You will save time and work if your site uses the standard HTML elements listed in the following table. Sometimes it is useful to use the tag as a substitute for a button. To stop the automatic browser navigation when the anchor is clicked, set the returnValue property of the window.event object to False . This tag allows you to define areas receiving focus on a complex image map. Default form UI elements, which act as TAB stops.
Frames can also act as TAB stops.
Once the focus has entered the frame, subsequent tabbing will enumerate contents before exiting to the next frame. You can enable keyboard navigation by assigning the tabIndex attribute to these tags. You can give your whole document a valid tabIndex and accessKey attribute. The differences between these events can be seen in the following table. This event occurs when the user presses and releases any alphanumeric key.