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 :focus selector is supported in all major browsers.
Note: For :focus to work in IE8, a <!DOCTYPE> must be declared.
CSS tutorial: CSS Pseudo classes
Complete CSS Selector Reference
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