How can I make event.srcElement work in Firefox and what does it mean?

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srcElement is proprietary property originally coming from IE. The standardized property is target:

var target = event.target || event.srcElement;

if(target.onclick == null) { // shorter than getAttribute('onclick')
    //...
    document.mainForm.submit();
}

Also have a look at quirksmode.org – Event properties for more cross browser information.

Regarding the question what it is doing:

event.target / event.srcElement contains a reference to the element the event was raised on. getAttribute('onclick') == null checks whether a click event handler is assigned to element via inline event handling.

Is it important? We cannot say because we don’t know what the ...code.. is doing.

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