forms - HTML - use of the onbeforesubmit attribute -


i found form event attribute called onbeforesubmit processes given function/request before form submitted.

while found useful, seems strange me no 'official' documentation found event attribute, vague reference microsoft web page , forums. no w3schools or w3 reference (not far have looked up).

is old/deprecated event attribute or maybe experimental one? have tested google chrome far.

its , old attribute . work can replaced onsubmit. can write code in manner of want execution , cal on onsubmit


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