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Not allowed to add attribute to <form> tag because it's a reserved name

Hi. I need to adda a onSublit attribute to one of my tags.
What I need is <form onSubmit="createObject(); return false" >

But I’m not allowed becaus it’s saying that onSubmit is a reserved name.

This guy is having the same issue (link). And I believe that you should just allow us to use this keyword.
Thanks

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