Hi webkit-dev, DOM MutationObservers (see meta bug https://bugs.webkit.org/show_bug.cgi?id=68729) have been shipping as WebKitMutationObserver in Chromium since earlier this year. The feature is fully specced as part of DOM4 (http://www.w3.org/TR/domcore/#mutation-observers) and is implemented in Firefox. Mozilla has also recently unprefixed their version of the API (https://bugzilla.mozilla.org/show_bug.cgi?id=749920), and I'd like to do the same (https://bugs.webkit.org/show_bug.cgi?id=85161).
The tricky part is that while the Chromium version is complete and compatible with Firefox, there's one piece missing from all other ports (https://bugs.webkit.org/show_bug.cgi?id=78290). The short version is that each port needs to be able to run some code (delivering mutations) at the end of every task (see http://www.whatwg.org/specs/web-apps/current-work/multipage/webappapis.html#processing-model-2, step 4 "Perform a microtask checkpoint"). Without this code, mutations due to user input are not delivered in a timely fashion. It's easy for Chromium to do this because we have our own MessageLoop abstraction wrapping the native event loops on various platforms, so our definition of end-of-task is easy to define. But implementing this properly is likely to be slightly different for every port. In the short term, my plan is to add the unprefixed version (in addition to the prefixed) of MutationObserver when PLATFORM(CHROMIUM) is enabled. But I'd like to help other ports implement this appropriately, and provide the unprefixed version there too. Please let me know how I can be of assistance. Let me know if you have questions or concerns, Adam Klein _______________________________________________ webkit-dev mailing list [email protected] http://lists.webkit.org/mailman/listinfo.cgi/webkit-dev
