在HTML中,表格不应该用于布局,这似乎是普遍的观点。

Why?

我从来没有(老实说,很少)看到过支持这一点的有力论据。通常的答案是:

It's good to separate content from layoutBut this is a fallacious argument; Cliche Thinking. I guess it's true that using the table element for layout has little to do with tabular data. So what? Does my boss care? Do my users care?Perhaps me or my fellow developers who have to maintain a web page care... Is a table less maintainable? I think using a table is easier than using divs and CSS.By the way... why is using a div or a span good separation of content from layout and a table not? Getting a good layout with only divs often requires a lot of nested divs. Readability of the codeI think it's the other way around. Most people understand HTML, few understand CSS. It's better for SEO not to use tablesWhy? Can anybody show some evidence that it is? Or a statement from Google that tables are discouraged from an SEO perspective? Tables are slower.An extra tbody element has to be inserted. This is peanuts for modern web browsers. Show me some benchmarks where the use of a table significantly slows down a page. A layout overhaul is easier without tables, see css Zen Garden.Most web sites that need an upgrade need new content (HTML) as well. Scenarios where a new version of a web site only needs a new CSS file are not very likely. Zen Garden is a nice web site, but a bit theoretical. Not to mention its misuse of CSS.

我对使用divs + CSS而不是表的良好参数非常感兴趣。


当前回答

508符合性-屏幕阅读器能够理解你的标记。 等待呈现——直到</table>元素结束,表格才会在浏览器中呈现。

其他回答

Layout should be easy. The fact that there are articles written on how to achieve a dynamic three column layout with header and footer in CSS shows that it is a poor layout system. Of course you can get it to work, but there are literally hundreds of articles online about how to do it. There are pretty much no such articles for a similar layout with tables because it's patently obvious. No matter what you say against tables and in favor of CSS, this one fact undoes it all: a basic three column layout in CSS is often called "The Holy Grail".

如果这不能让你说“WTF”,那么你现在真的需要放下酷爱饮料了。

我喜欢CSS。它提供了惊人的样式选项和一些很酷的定位工具,但作为一个布局引擎,它是有缺陷的。需要某种类型的动态网格定位系统。一个直接的方法来对齐多个轴上的盒子,而不知道他们的大小。我不在乎你叫它<table>或<gridlayout>或其他什么,但这是CSS中缺少的一个基本布局特性。

更大的问题是,由于不承认有缺失的特性,CSS狂热者一直在阻碍CSS的发展。如果CSS能像世界上其他布局引擎一样提供像样的多轴网格定位,我很乐意停止使用表格。(你应该意识到这个问题已经被除了W3C之外的所有人用多种语言解决过很多次了,对吧?没有人否认这样一个功能是有用的。)

叹息。足够的通风。去吧,把头埋进沙子里。

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.

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.

In the past, screen readers and other accessibility software had a difficult time handling tables in an efficient fashion. To some extent, this became handled in screen readers by the reader switching between a "table" mode and a "layout" mode based on what it saw inside the table. This was often wrong, and so the users had to manually switch the mode when navigating through tables. In any case, the large, often highly nested tables were, and to a large extent, are still very difficult to navigate through using a screen reader.

The same is true when divs or other block-level elements are used to recreate tables and are highly nested. The purpose of divs is to be used as a fomating and layout element, and as such, are intended used to hold similar information, and lay it out on the screen for visual users. When a screen reader encounters a page, it often ignores any layout information, both CSS based, as well as html attribute based(This isn't true for all screen readers, but for the most popular ones, like JAWS, Windows Eyes, and Orca for Linux it is).

为此,表格式数据,也就是逻辑上有意义的在二维或多维维度中排序的数据,具有某种标题,最好放在表中,并使用div来管理页面上内容的布局。(另一种思考“表格数据”的方式是尝试以图表形式绘制它……如果你不能,它可能不是最好的表示在一个表中)

Finally, with a table-based layout, in order to achieve a fine-grained control of the position of elements on the page, highly nested tables are often used. This has two effects: 1.) Increased code size for each page - Since navigation and common structure is often done with the tables, the same code is sent over the network for each request, whereas a div/css based layout pulls the css file over once, and then uses less wordy divs. 2.) Highly nested tables take much longer for the client's browser to render, leading to slightly slower load times.

在这两种情况下,“最后一英里”带宽的增加,以及更快的个人电脑缓解了这些因素,但它们仍然是许多网站存在的问题。

With all of this in mind, as others have said, tables are easier, because they are more grid-oriented, allowing for less thought. If the site in question is not expected to be around long, or will not be maintained, it might make sense to do what is easiest, because it might be the most cost effective. However, if the anticipated userbase might include a substantial portion of handicapped individuals, or if the site will be maintained by others for a long time, spending the time up front to do things in a concise, accessible way may payoff more in the end.

将内容与布局分开是很好的 但这是一个错误的论点;陈词滥调的思考

这是一个错误的论点,因为HTML表格是布局!内容是表中的数据,表示是表本身。这就是为什么从HTML中分离CSS有时会非常困难。您不是将内容与表示分开,而是将表示与表示分开!一堆嵌套的div和一个表没有什么不同——它只是一组不同的标签。

把HTML和CSS分开的另一个问题是,它们需要彼此的密切了解——你真的不能把它们完全分开。无论您做什么,HTML中的标记布局都与CSS文件紧密耦合。

我认为表与div的区别取决于应用程序的需要。

在我们在工作中开发的应用程序中,我们需要一个页面布局,其中各个块将动态地调整自己的大小以适应其内容。我花了几天时间试图让它与CSS和div跨浏览器工作,这是一个完全的噩梦。我们换了桌子,一切都很顺利。

然而,我们的产品有一个非常封闭的受众(我们销售的是带有web界面的硬件),可访问性问题不是我们关心的问题。我不知道为什么屏幕阅读器不能很好地处理表格,但我猜如果这是开发人员必须处理的方式。