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

如果你在这方面支持表格角度,找一个有表格的网站,然后给自己买一个屏幕阅读器——关掉屏幕阅读器,关掉你的显示器。

然后尝试一个不错的语义正确的div布局网站。

你会发现其中的不同。

如果表格中的数据是表格而不是为了布局页面,那么表格并不是邪恶的。

其他回答

我没有对DIVs有利的论据。

我会说:如果事实属实,那就接受吧。

值得注意的是,要找到一种好的DIV+CSS方法来在两列或三列中呈现内容,并且在所有浏览器上都是一致的,并且看起来仍然是我想要的方式,即使不是不可能,也是很困难的。

在我的大多数布局中,这让平衡感向表格倾斜了一点,尽管我对使用它们感到内疚(不知道为什么,人们只是说它不好,所以我试着听他们的),最后,务实的观点是,对我来说,使用表格更容易、更快。我不是按小时计酬的,所以桌子对我来说比较便宜。

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.

1:是的,你的用户很关心。如果他们使用屏幕阅读器,它就会丢失。如果我使用任何其他试图从页面中提取信息的工具,遇到不用于表示表格数据的表是一种误导。

div或span用于分隔内容是可以接受的,因为这正是那些元素的含义。当我,一个搜索引擎,一个屏幕阅读器或其他任何东西,遇到一个表格元素,我们期望这意味着“以下是表格数据,表示在一个表中”。当我们遇到div时,我们期望“这是一个用于将内容划分为单独部分或区域的元素。

2 .可读性:错误。如果所有的表示代码都是css,我可以阅读html,我将理解页面的内容。或者我可以阅读css和理解的表示。如果html中的所有内容都是混杂在一起的,那么在我甚至可以看到什么是内容,什么不是内容之前,我必须在脑海中剔除所有与表示相关的部分。 此外,我害怕遇到一个不懂css的web开发人员,所以我真的不认为这是一个问题。

3:表比较慢:是的,它们比较慢。原因很简单:在呈现表之前,必须对表进行完整的解析,包括其内容。可以在遇到div时呈现它,甚至在它的内容被解析之前。这意味着div会在页面加载完成之前显示出来。

还有一个好处是,表格更加脆弱,在不同的浏览器中呈现的效果并不总是一样的,不同的字体和字体大小以及所有其他可能导致布局变化的因素。表格是一种很好的方法,可以确保你的网站在某些浏览器中会偏离一两个像素,当用户改变字体大小或以任何其他方式改变设置时,它不会很好地缩放。

Of course #1 is the big one. A lot of tools and applications depend on the semantic meaning of a webpage. The usual example is screen-readers for visually impaired users. If you're a web developer, you'll find that many large companies who may otherwise hire you to work on a site, require that the site is accessible even in this case. Which means you have to think about the semantic meaning of your html. With the semantic web, or more relevantly, microformats, rss readers and other tools, your page content is no longer viewed exclusively through a browser.

I have found that even with the best planning divs come up short in several respects. For instance. there is no way with divs to have a bottom bar that always sits at the bottom of the browser, even when the rest of the content does not go to the bottom of the browser. Also, you cannot elegantly do anything better than three columns, and you cannot have columns that grow and shrink according the the width of their content. In the end, we try to use divs first. However, we will not limit our html designs based on some religious content vs layout ideal.

我想使用表格元素进行布局确实与表格数据没有什么关系。那又怎样?我的老板在乎吗?我的用户关心吗?

谷歌和其他自动化系统确实关心这些问题,而且它们在许多情况下同样重要。语义代码对于非智能系统来说更容易解析和处理。