:之前&&:在伪元素未显示 Firefox 之后 [英] :before && :after pseudo elements not showing Firefox

问题描述

Firefox 不显示 :after 和 :before 但它们会在 Chrome 中显示.

Firefox is not displaying :after and :before but they do show in Chrome.

火狐和火狐铬合金:

直接在 Firefox 中查看源代码显示 CSS 在那里:

Viewing the source directly in Firefox shows the CSS is there:

使用 :after 在页面上的多个元素上发生这种情况.

This is happening on multiple elements on the page using :after.

我之前和之后都试过.我也尝试过 :: 和 : 变体.

I have tried using both before and after. I have also tried both :: and : variations.

如果我在 codepen 中使用相同的 CSS，它会起作用:http://codepen.io/anon/pen/XXOZWL

If I use the same CSS in codepen it works: http://codepen.io/anon/pen/XXOZWL

<input type="checkbox" class="mobile_auth" />

.mobile_auth {
    visibility: hidden;
}

.mobile_auth:after {
    background-image: url('https://lh4.googleusercontent.com/-gD_ItALdha8/AAAAAAAAAAI/AAAAAAAAAB4/eEbUyChzCJc/photo.jpg?sz=110');
    content: '';
    height: 33px;
    width: 33px;
    display: block;
    cursor: pointer;
    visibility: visible;
    margin: auto;
    position: relative;
    top: -3px;
    left: 3px;
}

.mobile_auth::after {
    background-image: url('https://lh4.googleusercontent.com/-gD_ItALdha8/AAAAAAAAAAI/AAAAAAAAAB4/eEbUyChzCJc/photo.jpg?sz=110');
    content: '';
    height: 33px;
    width: 33px;
    display: block;
    cursor: pointer;
    visibility: visible;
    margin: auto;
    position: relative;
    top: -3px;
    left: 3px;
}

.mobile_auth:checked:after {
    background-position: right;
}

您可以在以下位置查看实时页面:***.com 登录用户:demo 通行证:demo 并单击配置".最新的 Firefox 中缺少许多按钮.

You can see the page live at: ***.com login with User: demo Pass: demo and click 'config'. Lots of buttons are missing in the latest Firefox.

这很奇怪，因为它根本没有显示.它不像元素在那里，我看不到它.它甚至没有显示它存在于控制台中.

It's strange because it doesn't show at all. It's not like the element is there and I can't see it. It isn't even showing that it exists in console.

推荐答案

你不能在 不能有内容的元素上使用 ::after 和 ::before，例如 或 .

You cannot use ::after and ::before on elements that cannot have content, such as <input /> or <img />.

::after 和 ::before 是这样工作的:

::after and ::before work like this:

<element>
  ::before
  ***content***
  ::after
</element>
<next-element>***content***</next-element>

它们被插入在 DOM 节点的内容之前和之后.由于不能有内容，所以没地方放.

They get inserted before and after the content of a DOM node. Since <input /> cannot have content, there's nowhere to put it.

现在让我们检查一个复选框:

Now let's check with a checkbox:

<input type="checkbox" />
<next-element>***content***</next-element>

这里不能有***内容***用伪元素包围.

Here, there cannot be ***content*** to surround with pseudo elements.

这篇关于:之前&&:在伪元素未显示 Firefox 之后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！