blocks|key|4461909|text|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4461910|没有浏览器支持所有HTML5或CSS3|unordered-list-item|4461911|许多浏览器(包括IE8)都支持HTML5或CSS3|4461912|中添加的一些功能所有浏览器都支持某些HTML5|4461913|所有主流图形浏览器都支持某些CSS3|4461914|<>F29|4461915|担心你想要实现的目标，然后寻找实现它的最佳方式。不要一开始就使用可用的工具，然后再尝试使用它们。|4461916|为最低公分母进行开发，然后从那里进行progressively+enhance。|offset|length|4461917|entityMap|0|LINK|mutability|MUTABLE|url|http://en.wikipedia.org/wiki/Progressive_enhancement^0|0|0|0|0|0|0|0|I|L|0|0^^$0|@$1|2|3|-4|4|5|6|Z|7|@]|8|@]|9|$]]|$1|A|3|B|4|C|6|10|7|@]|8|@]|9|$]]|$1|D|3|E|4|C|6|11|7|@]|8|@]|9|$]]|$1|F|3|G|4|C|6|12|7|@]|8|@]|9|$]]|$1|H|3|I|4|C|6|13|7|@]|8|@]|9|$]]|$1|J|3|K|4|5|6|14|7|@]|8|@]|9|$]]|$1|L|3|M|4|5|6|15|7|@]|8|@]|9|$]]|$1|N|3|O|4|5|6|16|7|@]|8|@$P|17|Q|18|1|19]]|9|$]]|$1|R|3|-4|4|5|6|1A|7|@]|8|@]|9|$]]]|S|$T|$4|U|V|W|9|$X|Y]]]]

<ul>
<li>No browser supports all of HTML 5 or CSS 3</li>
<li>Many browsers (including IE8) support some features added in HTML 5 or CSS 3</li>
<li>All browsers support some of HTML 5</li>
<li>All mainstream graphical browsers support some of CSS 3</li>
</ul>

Worry about what you want to achieve, then look for the optimal way to achieve it. Don't start with the tools available and then try to find a use for them.

Develop for the lowest common denominator and then <a href="http://en.wikipedia.org/wiki/Progressive_enhancement" rel="noreferrer">progressively enhance</a> from there.

blocks|key|4461946|text|试着看看caniuse或html5test网站。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|4461947|entityMap|0|LINK|mutability|MUTABLE|url|http://caniuse.com/|1|http://html5test.com/^0|4|7|0|C|9|1|0^^$0|@$1|2|3|4|5|6|7|N|8|@]|9|@$A|O|B|P|1|Q]|$A|R|B|S|1|T]]|C|$]]|$1|D|3|-4|5|6|7|U|8|@]|9|@]|C|$]]]|E|$F|$5|G|H|I|C|$J|K]]|L|$5|G|H|I|C|$J|M]]]]

Try to look at <a href="http://caniuse.com/" rel="nofollow">caniuse</a> or <a href="http://html5test.com/" rel="nofollow">html5test</a> websites.

blocks|key|1791758|text|IE8不支持HTML5，因为它不是HTML4的一部分，因为它是开发出来的，甚至在HTML5成为W3C草案之前。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1791759|CSS3:有一个属性没有出现在CSS2.1中，IE8实际上支持这个属性，比如text-wrap。然而，这并不值得一提。特别是所有的好东西，比如方框阴影和圆角，在IE8中是不存在的。|offset|length|style|CODE|1791760|查看yojimbo87答案中的链接，了解有关受支持属性的更多详细信息。|1791761|更糟糕的是，即使是IE9也不支持那么多的HTML5。他们专注于画布，视频和音频，并声称它现在是"HTML5+ready“。但是，例如，所有新的表单字段都完全缺失了，更不用说许多新的JavaScript+API了。|1791762|所以，简而言之，不，IE8不支持HTML5。但是，它可以显示HTML5文档，因为该规范在编写时考虑到了针对较旧浏览器的后备选项。|1791763|entityMap^0|0|12|9|0|0|0|0^^$0|@$1|2|3|4|5|6|7|P|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|Q|8|@$D|R|E|S|F|G]]|9|@]|A|$]]|$1|H|3|I|5|6|7|T|8|@]|9|@]|A|$]]|$1|J|3|K|5|6|7|U|8|@]|9|@]|A|$]]|$1|L|3|M|5|6|7|V|8|@]|9|@]|A|$]]|$1|N|3|-4|5|6|7|W|8|@]|9|@]|A|$]]]|O|$]]

IE8 supports nothing of HTML5, that wasn't part of HTML4, since it was developed, before HTML5 became even a W3C draft.

CSS3: There is the one or other property, that didn't make it in CSS 2.1, that IE8 actually supports, like <code>text-wrap</code>. However, it's not worth mentioning it. Especially all the goodies like box shadows and rounded corners don't exist in IE8.

Look at the links in yojimbo87's answer for more details on supported properties.

What is worse, is that even IE9 doesn't support that much of HTML5. They focused on canvas, video and audio and claim it now to be "HTML5 ready". But, for example, all the new form fields are completely missing, not speaking of lots of new JavaScript APIs.

So, to put it in a nutshell, no, IE8 doesn't support HTML5. It can, however, display HTML5 documents, since the specification is written with fallback options for older browsers in mind.

blocks|key|4462058|text|ie6和ie7几乎不支持html5和css3。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4462059|查看Quirksmode的兼容性表：http://www.quirksmode.org/compatibility.html|offset|length|4462060|如果你需要用html5进行开发，我会推荐你去看看现代。它是一个javascript库，用于测试用户的浏览器并修改html/css以适应其功能。|4462061|http://www.modernizr.com/|4462062|entityMap|0|LINK|mutability|MUTABLE|url|http://www.quirksmode.org/compatibility.html|1^0|0|I|18|0|0|0|0|P|1|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|T|8|@]|9|@$D|U|E|V|1|W]]|A|$]]|$1|F|3|G|5|6|7|X|8|@]|9|@]|A|$]]|$1|H|3|I|5|6|7|Y|8|@]|9|@$D|Z|E|10|1|11]]|A|$]]|$1|J|3|-4|5|6|7|12|8|@]|9|@]|A|$]]]|K|$L|$5|M|N|O|A|$P|Q]]|R|$5|M|N|O|A|$P|I]]]]

ie6 &amp; ie7 have almost no support for html5 &amp; css3.

Take a look at Quirksmode's compatibility table at:
<a href="http://www.quirksmode.org/compatibility.html" rel="nofollow">http://www.quirksmode.org/compatibility.html</a>

If you need to develop in html5 I would recommend taking a look at Modernizr. It is a javascript library that tests the users's browser and modifies the html/css to suit it's capabilities. 
<a href="http://www.modernizr.com/" rel="nofollow">http://www.modernizr.com/</a>

blocks|key|4461931|text|HTML5规范仍处于开发阶段。您可以尝试销售尚未开发的客户产品。与InternetExplorer一样，它只支持HTML5当前规范的5%25左右。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4461932|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

The HTML5 specification is still in development phaze. You can try selling a client stuff, that is not yet developed.
As with InternetExplorer, then no, it supports just about 5% of HTML5 current specs.

blocks|key|2349120|text|IE8在很大程度上不支持HTML5和CSS3。我建议你使用‘壁虎’浏览器家族的火狐4，或者使用谷歌chrome或'Webkit‘浏览器家族的Safari+(如果你使用的是MacOSX)。他们对HTML5有很好的支持。虽然我自己还没有尝试过，但我听说IE9对HTML5有很好的支持。但它只能在Windows7上运行。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2349121|不过，我会选择Firefox或Chrome。|2349122|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|F|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|G|8|@]|9|@]|A|$]]|$1|D|3|-4|5|6|7|H|8|@]|9|@]|A|$]]]|E|$]]

HTML5 and CSS3 is not supported to a great extent on IE8. I would suggest you to use Firefox 4 from the 'Gecko' browser family or Google chrome or Safari (if you are on MacOSX) from the 'Webkit' browser family. They have great support for HTML5. Although I haven't tried it myself, I hear IE9 has excellent support for HTML5. But it runs only on Windows 7.

Firefox or Chrome would be my choice though.

blocks|key|5877427|text|以目前浏览器对HTML5和CSS3的支持，你的客户必须a)疯了或者b)不知道他们在说什么。虽然HTML5和CSS3确实很快就获得了支持，但大多数浏览器对这两种技术的更高级特性的支持并不是很好，例如，<audio>和<video>就没有得到太广泛的支持。<canvas>也不是。至于CSS3，有相当一部分得到了很好的支持，但IE用户将不得不接受没有它的支持。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|5877428|另外，IE6在中国的使用率仍然非常高，所以如果你的目标市场是这个市场，那就坚持使用旧的、支持得更好的技术。|5877429|entityMap^0|2R|7|2Z|7|3I|8|0|0^^$0|@$1|2|3|4|5|6|7|J|8|@$9|K|A|L|B|C]|$9|M|A|N|B|C]|$9|O|A|P|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|Q|8|@]|D|@]|E|$]]|$1|H|3|-4|5|6|7|R|8|@]|D|@]|E|$]]]|I|$]]

With current browser support of HTML5 and CSS3, your client must either a) be insane or b) not know what they're on about. While it is true that HTML5 and CSS3 are gaining support pretty quickly, the majority of browsers don't have good support for the more advanced features of the two techs, for example, <code>&lt;audio&gt;</code> and <code>&lt;video&gt;</code> aren't too widely supported. Neither is <code>&lt;canvas&gt;</code>. As for CSS3, quite a few bits of it are supported well, but IE users will have to do without.

As an additional note, IE6 is still in very heavy use in China, so if you're targeting that market, stick with the older, better supported technologies.

blocks|key|1795168|text|实际上IE-8支持HTML-4，对于HTML-5最好使用chrome、firfox或sefari。更多信息，您可以查看here|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1795169|entityMap|0|LINK|mutability|MUTABLE|url|http://www.podinaproduction.tk/2017/11/HTML5-CSS3.html^0|1N|4|0|0^^$0|@$1|2|3|4|5|6|7|L|8|@]|9|@$A|M|B|N|1|O]]|C|$]]|$1|D|3|-4|5|6|7|P|8|@]|9|@]|C|$]]]|E|$F|$5|G|H|I|C|$J|K]]]]

Actually IE-8 support HTML-4, its better to use chrome,firfox or sefari for HTML-5. More you can see <a href="http://www.podinaproduction.tk/2017/11/HTML5-CSS3.html" rel="nofollow noreferrer">here</a>

I have requirement where the client needs their website to be developed in <a href="/questions/tagged/html5" class="post-tag" title="show questions tagged 'html5'" rel="tag">html5</a> and <a href="/questions/tagged/css3" class="post-tag" title="show questions tagged 'css3'" rel="tag">css3</a>. However it seems like <a href="/questions/tagged/ie6" class="post-tag" title="show questions tagged 'ie6'" rel="tag">ie6</a>, <a href="/questions/tagged/ie7" class="post-tag" title="show questions tagged 'ie7'" rel="tag">ie7</a> don't support HTML5 and CSS3. The client said that HTML5 and CSS3 is supported in <a href="/questions/tagged/ie8" class="post-tag" title="show questions tagged 'ie8'" rel="tag">ie8</a>, but I need to know to which degree it is actually supported.

Does IE8 support HTML5 and CSS3?

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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我有要求在那里的客户需要他们的网站是在和开发。然而，看起来像，不支持HTML5和CSS3。客户说支持HTML5和CSS3，但我需要知道它在多大程度上得到了支持。

问IE8是否支持HTML5和CSS3？
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