为什么 HTML 5 仍然支持展示元素？
See list here:
http://www.w3schools.com/html5/html5_reference.asp
like <b> , <i>, <br>, <hr>, <small>?
Is it means no cons to use these? But what about content and presentation seperation?
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我想到两个原因：
因为有些人（不是我，这里是关于此观点的入门 和 这里是 WHATWG 常见问题解答）不要将它们视为演示性的。他们认为，
有自己的语义，例如，不正确并且文本无论如何都应该是粗体（恕我直言，因此我们有)因为 HTML5 具有实用且向后兼容的方法：在 HTML4 中有效的内容也应该在 HTML5 中有效。他们认为，这就是 XHTML2 消亡的原因。
Two reasons come to mind:
Because some people (not me, here is a primer about this opinion and here are the WHATWG FAQ about this) don't think of them as presentational. They argue, that
<b>has semantics of its own, for example, where<strong>is not right and the text should be bold anyways (IMHO therefore we have<span>)Because HTML5 has a pragmatic and backwards compatible approach: What worked in HTML4 should work too in HTML5. They argue, that this is why XHTML2 died.
首先看看WHATWG说了一下（上面引用的相关问题的答案中也提到了这一点）。
据说（正如我所想的那样） ; 和 使用屏幕阅读器时提供强调，但根据 Harry Roberts 的这篇文章，事实证明，在实践中，屏幕阅读器不会强调以这种方式标记的文本。
最后，阅读有关 （上面第一个链接的常见问题解答中已经提到了）：
和 ：
同样，请查看 、
和
（那里也有例子。）
First have a look what WHATWG says about it (this is also mentioned in the answer to the related question cited above).
It is said (as I thought, too) that <strong> and <em> provide an emphasis when using a screen reader, but according to this article by Harry Roberts, it turns out that in practice screen readers don't accentuate text marked this way.
And last, read the spec about <b> (it's already mentioned in the FAQ in the first link, above):
and <i>:
Likewise, have a look at <small>, <hr> and <br> (there are examples there, too.)
他们还重新定义了其中几个元素的含义和语义。他们意识到需要一个执行
之类的元素，并且已经有一个元素，因此他们保留了它，并保留了向后兼容性，而不是引入新的东西。They have also redefined the meaning and semantics of several of these elements. They realized the need for an element that does something like
<b>and there was already an element, so they kept it, and preserved backwards compatibility, instead of introducing something new.