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Editorial Team
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Asked: 2026-05-23T11:40:01+00:00

I made this fiddle that listens for a few different MutationEvents , specifically DOMCharacterDataModified

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I made this fiddle that listens for a few different MutationEvents, specifically DOMCharacterDataModified, DOMSubtreeModified, and DOMNodeInserted when changing the innerHTML of a div.

http://jsfiddle.net/newtang/kysTm/15/

Interestingly, Chrome shows:
DOMCharacterDataModified, DOMSubtreeModified

while Firefox 5 shows: DOMNodeInserted.

I’m not actually sure who’s correct. I found this old Mozilla bug:
https://bugzilla.mozilla.org/show_bug.cgi?id=368133 and the W3 docs (http://www.w3.org/TR/DOM-Level-2-Events/events.html), but I don’t find either particularly enlightening.

Does anyone know what the proper behavior is? I’d love to file a bug on someone so it’s consistent.

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  1. Editorial Team

    Firefox’s behaviour seems to be correct. You setting the innerHTML, so you do not change the characterData of an existing textNode, you insert a new textNode and remove any existing contents .(You may also observe DOMNodeRemoved in your example, you’ll see that it fires too)

    See the difference when really modifying the data of a textNode: http://jsfiddle.net/doktormolle/yQu8v/

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