Google gives very low priority to text content contained inside a table. I was giving some SEO advice to a local charity. In examining their website it was using tables to layout the site. Looking at each page, no matter what words - or combination of words - from their pages I used in the Google search box the pages would not come up in any of the top search pages. (However, by specifying the site in the search the page was returned.) One page was well copy written by normal standards to produce a good result in a search but still it didn't appear in any of the first pages of search results returned. (Note this text was within a table.) I then spotted a section of text on the pages which was in a div rather than a table. We put a few of the words from that div in the search engine. Result? It came in at No.2 in the search result.

下面是我的程序员在一个类似的帖子中给出的答案

语义101

首先看一下这段代码，想想哪里出了问题……

class car {
    int wheels = 4;
    string engine;
}

car mybike = new car();
mybike.wheels = 2;
mybike.engine = null;

当然，问题在于自行车不是汽车。car类对于bike实例是不合适的类。代码没有错误，但是语义不正确。这对程序员的形象很不利。

语义102

现在将此应用于文档标记。如果您的文档需要显示表格数据，那么适当的标记将是<table>。但是，如果将导航放在表中，则滥用了<table>元素的预期用途。在第二种情况下，您没有表示表格数据—您(mis)使用<table>元素来实现表示目标。

结论

游客会注意到吗?不。你的老板在乎吗?也许吧。作为程序员，我们有时会偷工减料吗?当然。但是我们应该吗?不。如果使用语义标记，谁会受益?你，还有你的职业声誉。现在去做正确的事吧。

当您需要确保元素在布局中保持特定的物理关系时，请使用表格。对于数据，表格通常是最适合使用的布局元素，因为您不希望列以超出预期的方式包装，从而混淆了关联。

也有人可能会说，必须保持特定关系的非数据元素也应该呈现在表中。

灵活的css布局非常适合于移动设备、大屏幕、打印和其他显示类型的内容，但有时，内容必须以非常特定的方式显示，如果这要求屏幕阅读器无法轻松访问它，那么它可能是非常合理的。

为了回应“表格更慢”的论点——你考虑的是渲染时间，这是一个错误的度量。通常情况下，开发人员会编写一个巨大的表格来完成页面的整个布局——这大大增加了要下载的页面的大小。不管你喜不喜欢，仍然有大量的拨号用户。

参见:过度使用ViewState

通过仍然使用表格布局，我们错过了在div方面的创新。

许多人提出了解决方案，使创建布局的divs更容易。最流行的是网格架构。有基于此体系结构的动态布局生成器。查看: 1) 960。Gs和(http://grids.heroku.com/) 2)蓝图 最近也是如此。

在架构和表格布局工具方面，我还没有看到太多创新。

我想说，撇开所有的理论，实际上布局与CSS和div更快。相反，在这个方向上的创新使它变得更容易。

This isn't really about whether 'divs are better than tables for layout'. Someone who understands CSS can duplicate any design using 'layout tables' pretty straightforwardly. The real win is using HTML elements for what they are there for. The reason you would not use tables for non-tablular data is the same reason you don't store integers as character strings - technology works much more easily when you use it for the purpose for which it is desgined. If it was ever necessary to use tables for layout (because of browser shortcomings in the early 1990s) it certainly isn't now.