多个“样式”属于“跨度”的属性。标签：应该发生什么？ [英] Multiple "style" attributes in a "span" tag: what's supposed to happen?

问题描述

考虑以下带有两个样式属性的HTML片段：

  < span style =color：bluestyle =font-style：italic>测试< / span> 
  

在Opera 12.16和Chrome 40中，它显示为蓝色的非斜体文本，而Internet Explorer 9显示蓝色斜体文字。如果有的话，标准说什么应该显示出来？

在HTML，SGML和 XML ，^（1）属性不能重复，并且只能在元素中定义一次。

所以你的例子：

 < span style =color：bluestyle =font-style：italic>测试< / span>对于HTML标准，
  

是不符合，并且会导致undefined行为，这就解释了为什么不同的浏览器呈现出不同的结果。

---

由于没有定义的解释方式，浏览器可以（1）：我可以找到的每篇文章都指出，属性是键/键，键/键值对或属性值对，这暗示着这些键必须是唯一的。 我可以找到的最佳资源状态：

$ b

^{属性名称（本例中为id和status）受到与其他XML中的名称;但是，在整个DTD中，它们不必是唯一的，但是，只能在给定元素的属性列表中 。 （Emphasis mine。）}

Consider the following HTML fragment with two style attributes:

<span style="color:blue" style="font-style:italic">Test</span>

In Opera 12.16 and Chrome 40, it shows up as blue non-italic text, while Internet Explorer 9 shows blue italic text. What, if anything, does the standard say is supposed to show up?

解决方案

In HTML, SGML and XML, ⁽¹⁾ attributes cannot be repeated, and should only be defined in an element once.

So your example:

<span style="color:blue" style="font-style:italic">Test</span>

is non-conformant to the HTML standard, and will result in undefined behaviour, which explains why different browsers are rendering it differently.

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Since there is no defined way to interpret this, browsers can interpret it however they want and merge them, or ignore them as they wish.

^{(1): Every article I can find states that attributes are "key/value" pairs or "attribute-value" pairs, heavily implying the keys must be unique. The best source I can find states:}

^{Attribute names (id and status in this example) are subject to the same restrictions as other names in XML; they need not be unique across the whole DTD, however, but only within the list of attributes for a given element. (Emphasis mine.)}

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