HTML5-mode was briefly switched on for Wikimedia wikis this week, from the afternoon of February 23. This would begin the process of Wikimedia supporting features available in the newest browsers, and would generally put it on a better footing for the future. HTML5 had been the default for external installs since MediaWiki 1.16, but had been disabled on WMF sites due to the nature of some custom code in use. Version 1.17, now used on WMF sites, was thought to be much more stable in this regard (bug #27478).
However, after deployment, a number of errors were soon noted. As expected, virtually every tool which relied on "screen-scraping" (analysing the HTML source of Wikipedia pages) broke in some way. Though this method has been known to be vulnerable to changes in the underlying source code for many years – and MediaWiki provides an alternative, the much more stable API, for this purpose – no-one had yet seen a need to update many of the tools frequently in use on Wikipedia sites, including Twinkle and Friendly on the English Wikipedia. Even after HTML5-mode was reverted, work continued on these gadgets to move them over to the API before another attempted deployment. Just as pressing was a knock-on problem where the encoding used in citations and anchors changed subtly, breaking links which relied on them (bug #27694). It is not known when HTML5-mode will be tried again.
Not all fixes may have gone live to WMF sites at the time of writing; some may not be scheduled to go live for many weeks.
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The switch to HTML5 does not add support for the video or audio tags. It's on the to-do list though. The multimedia beta provides an HTML video player, you may want to check it out. Reach Out to the Truth 04:07, 1 March 2011 (UTC)[reply]Well then find some other way to provide the content in a SEAMLESS fashion. And why not? Does it cost money (just shell out for a licence, get Jimbo to flash his mug on the pages a bit more.) And why does HAVING the content in flash hold us back in any way? Like I said, you can still have OGG in addition. You're not LOSING by having it that way. And we have JPEG images.