为什么输入标签不能直接在表单标签中使用？ [英] Why is an input tag not allowed directly within a form tag?

问题描述

我刚刚在 http://w3fools.com/#html_forms 上阅读以下内容：

非块级元素（例如< input> ）无法直接在< form> 标签直到HTML5。

我从来没有听说过这些内容，我看过的每个基本的HTML教程似乎都将输入标签直接放在表单标签中。所以我的问题有三个部分：

$ ul

上述声明是否合法？

为什么这是案件？ （是简单的疏忽，还是HTML规范的创建者试图通过创建这条规则来防止特定问题？）

建议使用输入构建表单的建议方法是什么？ （我们只是应该直接在form标签内部创建一个div或一个表格吗？）

$ b

• 根据标准，声明是合法的：在HTML 4.01中， < form> 指定它可能只包含块元素或< script> 。至于世界上每个浏览器都允许的情况，这没什么。


• 我只能猜测他们认为< form> 为不是布局标签，他们希望所有内联元素都包含在块元素中。


• 是的，您应该放置< div> ，< table> ，< p> < form> 中的表现元素。

I just read the following at http://w3fools.com/#html_forms:

Non-block-level elements (such as <input>) are not valid directly inside <form> tags until HTML5.

I had never heard of anything along these lines, and every basic HTML tutorial I've seen seems to be just fine with putting input tags directly inside a form tag. So my question has three parts:

• Is the above statement legitimate?
• Why is this the case? (Was it simply an oversight, or were the creators of the HTML spec trying to prevent specific problems by creating this rule?)
• What is the recommended way to construct a form with inputs? (Are we just supposed to create a div or a table directly inside the form tag?)

解决方案

It's standards pedantics.

• The statement is legitimate as far as the standard goes: in HTML 4.01, the definition for <form> specifies that it may only contain block elements or <script>. As far as what every browser in the world allows, it's fine.
• I can only guess that they consider <form> to not be a layout tag at all, and they want all inline elements to be contained inside a block element.
• Yes, you're supposed to place a <div>, <table>, <p>, or some other block presentational element inside the <form>.

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