CSS布局通常在可访问性方面要好得多，前提是内容以自然的顺序出现，并且没有样式表也有意义。不仅仅是屏幕阅读器难以适应基于表格的布局:它们也使移动浏览器更难正确呈现页面。

此外，使用基于div的布局，你可以很容易地用打印样式表做一些很酷的事情，比如从打印页面中排除页眉、页脚和导航——我认为这是不可能的，或者至少很难用基于表格的布局做到这一点。

If you're doubting that separation of content from layout is easier with divs than with tables, take a look at the div-based HTML at CSS Zen Garden, see how changing the stylesheets can drastically change the layout, and think about whether you could achieve the same variety of layouts if the HTML was table based... If you're doing a table-based layout, you're unlikely to be using CSS to control all the spacing and padding in the cells (if you were, you'd almost certainly find it easier to use floating divs etc. in the first place). Without using CSS to control all that, and because of the fact that tables specify the left-to-right and top-to bottom order of things in the HTML, tables tend to mean that your layout becomes very much fixed in the HTML.

实际上，我认为完全改变一个基于div和css的设计而不改变div是非常困难的。然而，使用基于div和css的布局，就更容易调整不同块之间的间距以及它们的相对大小。

一张桌子来布置也不错。但大多数情况下，仅靠一张表是无法得到所需的布局的。很快你就有了2到3个嵌套表。这变得非常麻烦。

It IS a LOT harder to read. That's not up to opinion. There's just more nested tags with no identifying marks on them. Separating content from presentation is a good thing because it allows you to focus on what you're doing. Mixing the two leads to bloated pages that are hard to read. CSS for styles allows your browser to cache the files and subsequent requests are much faster. This is HUGE. Tables lock you into a design. Sure, not everyone needs the flexibility of CSS Zen Garden, but I've never worked on a site where I didn't need to change the design a little bit here and there. It's much easier with CSS. Tables are hard to style. You don't have very much flexibility with them (i.e. you still need to add HTML attributes to fully control a table's styles)

我大概有4年没有用表格来处理非表格数据了。我没有回头。

我真的很想建议你阅读Andy Budd的《CSS Mastery》。棒极了。

图片在ecx.images-amazon.com http://ecx.images-amazon.com/images/I/41TH5NFKPEL._SL500_BO2,204,203,200_PIsitb-dp-500-arrow,TopRight,45，-64_OU01_AA240_SH20_.jpg

根据我对表的了解，如果嵌套了太多的表，在呈现页面时浏览器会有很大的开销。

1 -浏览器必须等待呈现最终视图，直到整个表被加载。

2 - The algorithm to render the table is expensive and is not in a single go. The browser, as and when, gets the contents, will try to render calculating the content width and height. So, if you are having nested tables, say, the browser has received the first row and the 1st cell is having large amount of content and width and height not defined, it will calculate the width and will render the first row, In the mean while it gets the 2nd row will cell#2 having loads of content! It will now calculate the width for 2nd row cells.. What about the first ? It will calculate widths recursively. That's bad at client side. (To site an example) As a programmer, you'll optimize stuffs such as time to fetch data, optimized data structures and etc. You optimize things to complete on server side, say in2 secs, but end user in getting the final view in 8 secs. What is wrong here ? 1. May be network is slow! What if network is fine ? What is network is delivering the contents in next 1 sec ? Where is this extra 5 secs getting consumed ? Thing to worry about-- The browser might be taking lot of time in estimating and rendering the tables!

如何优化表? 如果你使用表格，我建议，总是定义单元格的宽度。这并不能保证浏览器会盲目地只取这个宽度，但会对浏览器决定初始宽度有很大的帮助。

但是，最后，div是CSS可以被浏览器缓存的好方法;而表没有缓存!

根据508法规(对于视障屏幕阅读器)，表格应该只用于保存数据，而不是用于布局，因为它会导致屏幕阅读器崩溃。至少别人是这么告诉我的。

如果您为每个div分配名称，您也可以使用CSS将它们一起蒙皮。只是让他们坐成你想要的样子有点麻烦。

因为维护一个使用表格的网站是非常困难的，并且需要更长的编码时间。如果你害怕漂浮的潜水器，那就去上一门潜水课吧。它们并不难理解，而且它们的效率大约是前者的100倍，麻烦也少了100万倍(除非你不理解它们——但是，嘿，欢迎来到计算机的世界)。

任何考虑用表格做布局的人最好不要指望我来维护它。这是渲染网站最落后的方式。感谢上帝，我们现在有了更好的选择。我永远不会回去。

有些人可能没有意识到使用现代工具创建一个网站所带来的时间和精力的好处，这很可怕。

对于为了简单或临时的东西而拼凑在一起的HTML，表很有用。如果你正在构建一个大型网站，你应该使用div和CSS，因为随着时间的推移，随着网站的变化，它将更容易维护。