The onfocus event occurs when an element gets focus.
Onfocus is most often used with <input>, <select>, and <a>.
Tip: The onfocus event is the opposite of the onblur event.
The onfocus event is supported in all major browsers.
The onfocus attribute can be used within ALL HTML elements, EXCEPT: <base>, <bdo>, <br>,
<head>, <html>, <iframe>, <meta>, <param>, <script>, <style>,
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