问题描述
我找到了的响应式电子邮件模板，其中有诸如以下CSS声明之类的CSS声明：
I have found an example of responsive email templates where there are such CSS declarations such as the following:
a[class="btn"]
为什么使用这种语法，如果它完全相同：
Why is this syntax used if it's totally the same as:
a.btn
是否对移动浏览器或其他任何内容有影响？
Does it have any impact on mobile browsers or anything else?
推荐答案
[] 语法是。
a[class="btn"]
这将选择< a> 标记与 class =btn。但是，不会选择 class =btn btn_red的< a> >，例如（而会）。
This will select any <a> tag with class="btn". However, it will not select <a> which has class="btn btn_red", for example (whereas a.btn would). It only exactly matches that attribute.
您可能想要阅读。这对任何即将到来的网络开发者来说都是无价的。
You may want to read The 30 CSS Selectors you Must Memorize. It's invaluable to any up-and-coming web developer.
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