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The onfocus event activates when an element receives focus. The event can be specified as a JavaScript expression or the name of a JavaScript function.
If an expression is used, the JavaScript keyword this refers to the element that received focus.
If the name of a function is used, the function will receive 2 parameters when called:
- The browser event object
- A reference to the element that received focus
Example:
The following would draw a red border around the element once it receives focus.
onfocus: this.style.border = "1px solid red";