The prototype's function visible() (available under Element) should be
named as : isVisible() in accordance with naming-conventions, since
this function returns a boolean value.
It's not only about conventions but also it will make it easier for
developers to relate the functionality with the function-name.
If the isVisible() function is added (we all wish that it will be
added) to the next version of Prototype, the visible() function can
still be made available for backward compatibility.
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