HTML 属性需要引号吗? [英] Do HTML attributes need quotation marks?

问题描述

我正在开发一个网站，我想知道您是否需要在 HTML 属性周围加上引号，例如我看到过如下代码:

而不是:
<img src="http://example.com/image.jpg" width="350px" height="200px"/>.
有人知道答案吗?

I am working on a web site, and am wondering if you need to put quotation marks around HTML attributes for example I've seen code like:
<img src=http://example.com/image.jpg width=350px height=200px />
instead of:
<img src="http://example.com/image.jpg" width="350px" height="200px" />.
Does anyone know the answer to this?

推荐答案

如果属性包含非 ascii 或有空格的字符串，则需要将其用引号括起来

If the attribute contains a string that is not ascii or has whitespace then you need to wrap it in quotes

属性放置在开始标签内，由名称和一个值，以="字符分隔.属性值可以保留如果它不包含 ASCII 空格或任何 " ' ` = < 或>.否则，必须使用单引号或双引号引用它.该值以及="字符可以省略如果值是空字符串，则完全相同.

Attributes are placed inside the start tag, and consist of a name and a value, separated by an "=" character. The attribute value can remain unquoted if it doesn't contain ASCII whitespace or any of " ' ` = < or >. Otherwise, it has to be quoted using either single or double quotes. The value, along with the "=" character, can be omitted altogether if the value is the empty string.

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