HTML中的SCRIPT和STYLE元素的type属性？ [英] The type attribute of SCRIPT and STYLE elements in HTML?

问题描述

我听说（来自Crockford）LINK和SCRIPT元素上的哪些类型属性在这些元素用于加载外部资源时是多余的。 （因为HTTP响应决定资源的内容类型。）

 < link rel =样式表href = foo.css> 
 
< script src =foo.js>< / script> 
  

但是，如果将非HTML代码内联放置在STYLE和SCRIPT元素中，情况如何？

 < style> 
 / *内联CSS规则* / 
< / style> 
 
< script> 
 //嵌入JavaScript代码
< / script> 
  

是否在这些情况下设置了type属性？
当我们选择省略type属性时，是否有任何问题？

：类型属性对 < script> 和 < style> 。

作者必须为此属性提供值;这个属性没有默认值。

据我所知，所有浏览器缺省的默认回退是 text / javascript 和 text / css ，分别。这是普遍的（虽然无效）做法不使用类型属性。我仍然会指定它以避免浏览器问题。

HTML 5接受现实并将这些值声明为 < style> 和 < script> 。我非常肯定，这可以将它们关闭以保留内联内容，并自动使用正确的内容类型进行分析。

I heard (from Crockford) what type attributes on LINK and SCRIPT elements are superfluous when those elements are used to load external resources. (Because the HTTP response determines the content-type of the resource.)

<link rel="Stylesheet" href="foo.css">

<script src="foo.js"></script>

But what about the case when non-HTML code is placed inline inside the STYLE and SCRIPT elements?

<style>
    /* inline CSS rules */
</style>

<script>
    // inline JavaScript code
</script>

Is setting the type attribute in those cases recommended? Are there any issues when we choose to omit the type attribute?

解决方案

For HTML 4, the answer is simple: The type attribute is required for both <script> and <style>.

Authors must supply a value for this attribute; there is no default value for this attribute.

As far as I know, the default fallback in all browsers in its absence is text/javascript and text/css, respectively. It's widespread (though invalid) practice to not use the type attribute. I would still specify it to avoid browser problems.

HTML 5 accepts reality and declares these values as official defaults for <style> and <script>. I'm pretty sure this makes it okay to leave them off for inline content as well, which will be parsed using the correct content type automatically.

这篇关于HTML中的SCRIPT和STYLE元素的type属性？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！