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What is javascript: in a JavaScript event handler?
Such as:
<input onkeydown="javascript:return false;" type="text" name="textfield" />
It is a mistake. The pseudo-protocol is not needed in event handlers.
On a URL (
aelementhrefattribute, for instance), if you enterjavascript:and follow that with javascript, the browser will run the javascript code.For event handler, this is not needed, though the browser will not report an error.