CSS :focus Selector
Select and style an input field when it gets focus:
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Definition and Usage
The :focus selector is used to select the element that has focus.
Tip: The :focus selector is allowed on elements that accept keyboard events or other user inputs.
The numbers in the table specifies the first browser version that fully supports the selector.
Note: For :focus to work in IE8, a <!DOCTYPE> must be declared.
CSS tutorial: CSS Pseudo classes
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