是否有任何时间表来预测 HTML5 功能的支持？有来源吗？
计划在大型项目中使用 HTML5，我需要为未来的更改制定准确的时间表。
有没有消息来源告诉我 HTML5 的某个特定功能何时准备就绪？是否有针对每个特定 Web 引擎的 HTML5 支持的路线图？
只是为了了解更多详细信息，我正在开发一个社交/视频共享网站。我想使用从 CSS3 到 HTML5 再到 JavaScript 的新功能。不要告诉我“你现在可以使用 ”，因为我知道！
还要考虑这样一个事实，即所有人都需要一些时间才能将浏览器更新到新版本
Planning to use HTML5 in a big project, I need to make an exact timeline for future changes.
Is there any source to tell me when a particular feature of HTML5 will be ready? Is there a roadmap for HTML5 support for each particular web engine?
Just for some more details, I’m working on a social/video sharing site. I want to use new features from CSS3 to HTML5 to JavaScript. Don’t tell me “You can use <video> right now” because I know that!!
Also consider the fact that it takes some time for all people to update their browsers to new ones
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是的：
我什么时候可以使用...
Yes:
When can I use...
那么您希望 Microsoft、Apple、Mozilla、Opera 和 Google 确切地告诉您他们何时完成向浏览器添加功能？只需给他们发电子邮件，我相信他们会正确回答:)
不，有趣的问题。我认为任何浏览器制造商都不会承诺在未来特别遥远的将来实现特定的功能。就 HTML5 而言，规范本身规定，只有在两个实现达成一致之前，规范才会完成，因此这在很大程度上是“等待实现发布”的问题。
就 WebKit 和 Firefox 而言，它们是开源项目，我认为这使得承诺遥远的未来日期变得更加困难。话又说回来，我似乎记得微软在 Vista 上有点晚了，所以可能也很难承诺闭源项目的日期。如果您可以编辑问题并注明社交视频共享网站完成的确切日期，那将是一个好的开始。
Google 很快就出现了：
Internet Explorer
Microsoft 已经推出了 IE 9 测试版。此页面声称是某种路线图： http:// microsoft-journal.spaces.live.com/blog/cns!A33F7112F6C1D499!878.entry
还有他们的 Internet Explorer 博客
Firefox
Mozilla 在此宣布了他们的 3.6 计划：https://wiki.mozilla.org/Firefox/Namoroka
找不到 4 的类似文档（最初宣布为 3.7），但 robertc 指出该文档详细介绍了 HTML5（和 CSS3） Firefox 4 中添加的功能：https://developer.mozilla.org/en/Firefox_4_for_developers
WebKit （Safari 和 Chrome）
“Apple 不会对未来的产品发表评论” — http://trac.webkit。 org/wiki/FAQ
但是 WebKit 团队确实有一个博客，Surfin' Safari
Opera
Folks去年显然要求制定路线图： http://dev.opera.com/forums/topic /294965
So you want Microsoft, Apple, Mozilla, Opera and Google to tell you exactly when they’ll be done adding features to their browsers? Just e-mail them, I’m sure they’ll get right on that :)
Naw, interesting question. I don’t think any browser manufacturers commit to implementing specific features particularly far into the future. In the case of HTML5, the spec itself says that the spec won’t be done until there are two agreeing implementations, so it’s very much a matter of “wait until an implementation ships”.
In the case of WebKit and Firefox, they‘re open-source projects, which I imagine makes it more difficult to commit to far-future dates. Then again, I seem to remember Microsoft being a bit late with Vista, so it’s probably difficult to commit to dates for closed-source projects as well. If you could edit your question with the exact date when your social video sharing site will be finished, that’d be a good start.
A quick Google turns up:
Internet Explorer
Microsoft have got IE 9 in beta. This page claims to be some sort of roadmap: http://microsoft-journal.spaces.live.com/blog/cns!A33F7112F6C1D499!878.entry
There’s also their Internet Explorer Blog
Firefox
Mozilla announced their plans for 3.6 here: https://wiki.mozilla.org/Firefox/Namoroka
Couldn’t find a similar document for 4 (which was originally announced as 3.7), but robertc pointed to this document which details the HTML5 (and CSS3) features added in Firefox 4: https://developer.mozilla.org/en/Firefox_4_for_developers
WebKit (Safari and Chrome)
“Apple doesn’t comment on future products” — http://trac.webkit.org/wiki/FAQ
But the WebKit team do have a blog, Surfin’ Safari
Opera
Folks were apparently clamouring for a roadmap last year: http://dev.opera.com/forums/topic/294965
这完全取决于您的目标受众。如果是IE6普及率99%的韩国中年商人，你不太可能很快就能使用任何花哨的东西。如果是从事广告工作的艺术总监，您可能已经可以使用 Webkit 实现的任何尖端功能。
检查您的日志，并使用 sAc 链接的站点。
It all depends on your target audience. If it is South Korean middle aged businessmen with 99% IE6 penetration, you're not likely to be able to use anything fancy any time soon. If it's art directors working in advertising, you can probably already use whatever bleeding edge feature Webkit has implemented.
Check your logs, and use the site sAc linked.