[Webkit-unassigned] [Bug 8191] DOMAttrModified mutation event support

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=8191


John-David Dalton <john.david.dalton at gmail.com> changed:

           What    |Removed                     |Added
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                 CC|                            |john.david.dalton at gmail.com




--- Comment #18 from John-David Dalton <john.david.dalton at gmail.com>  2009-11-05 12:05:52 PDT ---
I would like to add that mutation events are great if you use them properly.
NWMatcher (a JavaScript CSS Selector engine) has no problems with them. View my
fork here http://github.com/jdalton/nwmatcher/raw/master/src/nwmatcher.js.

1) Avoid compatibility issues through feature detection.

2) Avoid the `slow down` by removing the mutation event listener the first time
it fires and set it up again on subsequent calls.

3) Detect if you are in an abusive while-loop and temporarily pause setting
mutation events.

With proper feature detection mutation events give NWMatcher a boost by
allowing it to cache dom results under certain situations. 

Just because something is buggy doesn't mean it should be ripped-out/abandoned.
Currently by viewing nwmatcher.js you will find it covers a lot of bugs in
querySelectorAll(). This does not mean that continued support for
querySelectorAll() should be dropped.

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