Firefox behaving strangely when using outlines and pseudo-elements

When it comes to combining outline and pseudo-elements, Firefox has a unique behavior compared to Chrome and Safari (I haven't tested other browsers). Is this a bug or is there a way to resolve it?

.main {
  position: relative;
  width: 100px;
  height: 100px;
  margin: 10px auto;
  border: 2px solid #f00;
  outline: 2px solid #00f;
}
.main:after {
  content: 'Hello';
  position: absolute;
  width: 100px;
  text-align: center;
  bottom: -50px;
}
.wtf {
  width: 400px;
  margin: 90px auto;
}
<div class="main"></div>
<div class="wtf">
  <p>In Chrome and Safari, the 'Hello' appears outside of the outline.</p>
  <p>However, in Firefox, the outline extends and the 'Hello' is inside it. Is this a bug in Firefox or can it be fixed somehow?</p>
</div>

Demo: http://codepen.io/romainberger/pen/nuxlh

Edit: Tested on Firefox 20.0, Chrome 28, and Safari 5.1

cssfirefoxpseudo-element

Answer №1

Currently being utilized for

creating a box shadow effect

similar to this

.main {
  position: relative;
  width: 100px;
  z-index:1;
  height: 100px;
  margin: 10px auto;
  border: 2px solid #f00;
  box-shadow:0px 0px 0px 3px #00f;
}
.main:after {
  content: 'Hello';
  position: absolute;
  text-align: center;
  bottom: -50px;
  left:0;
  right:0;
  z-index:2;
}

.wtf {
  width: 400px;
  margin: 90px auto;
}

View the demonstration here

Answer №2

Avoid using z-index in this scenario.

.main { 
  position: relative;
  width: 100px;
  height: 100px;
  margin: 10px auto;
  border: 2px solid #f00;
  box-shadow:0px 0px 0px 3px #00f;
}
.main:after {
  content: 'Hello';
  position: absolute;
  text-align: center;
  bottom: -50px;
  left:0;
  right:0;
}

.wtf {
  width: 400px;
  margin: 90px auto;
}

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