Focus is programmatically accessible via API’s.
Caret Browsing
Caret Browsing is a new accessibility feature that enables users to navigate a webpage with a moveable cursor on the screen by using the keyboard. Users can select and copy snippets of text as short as a single character by using only the keyboard. Other content types such as tables or images can also be selected and copied.
Pressing F7 turns Caret Browsing on or off. It can be enabled on a per-tab basis or for all tabs and windows. Moving the cursor within the text of a webpage is similar to moving the cursor within the text of a Microsoft Word document. Holding the SHIFT key down and pressing the arrow keys selects text.
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