你真的需要指定type属性吗？ [英] Do you really need to specify the type attribute?

问题描述

可能重复：

为什么写< script type =" text / javascript&何时由服务器设置mime类型？

我阅读了一段时间内深入HTML5，最近才读到它的语义章节。我注意到建议不在脚本使用 type =...属性和 style ，因为：

I read Dive into HTML5 a while back, and read its semantics chapter again just recently. I noted it advises not to use type="..." attributes on script and style, because:

• MIME类型应由服务器发送，


• JS和CSS是默认值，


• 浏览器不在乎。

但是，我认为仍然通常的做法是包括 type 属性（或者，恐怖，语言）脚本和 style 标签。假设服务器被正确配置为发送正确的MIME类型，是否有理由使用非显式的这些？

However, I see it is still common practice to include type attributes (or, horror, language) on both script and style tags. Assuming the server is properly configured to send the correct MIME types, are there reasons for using these other than being explicit?

EDIT ：这是

推荐答案

大多数人习惯于HTML 4 / XHTML和之前，其中 type 属性是必需的。

Most people are used to HTML 4/XHTML and before, where the type attribute is required for these elements.

对于HTML 5，这些都是可选的，

In regards to HTML 5, these are indeed optional and the spec gives a default, depending on the element.

对于 script 标签，默认为 text / javascript ：

如果语言不是由text / javascript描述的，那么type属性必须存在

If the language is not that described by "text/javascript", then the type attribute must be present

对于 style 标签，默认为 text / css ：

如果属性缺失，则使用type属性的默认值为text / css。

The default value for the type attribute, which is used if the attribute is absent, is "text/css".

所以，不需要，正如你所说的。但是，浏览器支持和服务器设置并不总是可以依赖的 - 显式是一个好主意，因为它避免了这样的问题。

So, not needed, as you stated. However, browser support and server setups can't always be relied on - being explicit is a good idea as it avoids such problems.

当然，并不是所有的浏览器支持HTML 5 - 那些不会使用早期版本的属性是必需的，并且您的javascript / css可能无法在这样的浏览器中解析，这意味着最终没有CSS或javascript在旧版的浏览器，当一个简单的解决方案向后兼容性是添加属性。

And of course, not all browsers out there support HTML 5 - those that don't will use an earlier version where the attribute is required and your javascript/css might not get parsed in such browsers, meaning you end up with no CSS or javascript on older browsers, when a simple solution for backwards compatibility is to add the attribute.

这篇关于你真的需要指定type属性吗？的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！