Why is it called onBlur? [closed]

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JavaScript has an event called onBlur that fires when a control loses focus. My question is: Why is it called that? Wouldn't all of our lives be easier if it was called OnFocusLost?

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I would imagine it is called this because when you lose focus on something it tends to become blurry.

No, I don't necessarily believe that my life would become easier if it was suddenly changed to onFocusLost.