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From: Lovely, Brian (CONT)
Date: Thu, Nov 17 2016 11:59AM
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Hey Shankar,
Focus is how we refer to the current element in a web page. For instance, tabbable elements like anchors and form elements will receive focus one at a time, in code order, when the tab key is repeatedly pressed. This order can be reversed by pressing shift+tab. Also, the contents of container elements can be read out one at a time, in code order, when the down or right arrow keys are repeatedly pressed. This order can be reversed by pressing the up or left arrow keys.
Visually impaired users may or may not be able to identify an issue with visible focus, depending on the severity of their visual impairment. Typically, we refer to a visible focus indicator, rather than visual focus. The visible focus indicator varies from browser to browser, but it is usually some kind of outline. When an element receives focus, it should display this visible focus indicator. This feature is useful for sighted keyboard-only users, because it allows them to track their current location in a web page. It is important to check for a visible focus indicator, because the default browser focus indicator can be obscured or removed by CSS styling during the development process.
I hope this helps!