问题描述
我找到了示例，其中有这样的CSS选择器，如下所示:
I have found an example of responsive email templates where there are such CSS selectors such as the following:
a[class="btn"]
为什么使用与以下语法完全相同的语法:
Why is this syntax used if it's totally the same as:
a.btn
它对移动浏览器或其他任何东西有影响吗?
Does it have any impact on mobile browsers or anything else?
推荐答案
[]语法是.
a[class="btn"]
这将选择任何带有class="btn"的<a>标签.但是，例如，它将不选择具有class="btn btn_red"的<a>(而将).它仅完全匹配该属性.
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.
您可能想阅读 30种CSS您必须记住的选择器.对于任何有前途的Web开发人员来说，这都是无价之宝.
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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