CSS：伪复选框在IE或Firebug中不起作用-CSS:afterpseudocheckboxnotworkinginIEorFirebug

I have the styling below to achieve a pseudo checkbox. In real life it has a background image to show the marks I want, but I simplified the example for researching purposes. It's working nicely in Chrome and Safari, but not in firefox or IE. Another set of eyes would be much appreciated.

我有下面的样式来实现一个伪复选框。在现实生活中，它有一个背景图像来显示我想要的标记，但我简化了用于研究目的的示例。它在Chrome和Safari中运行良好，但不适用于Firefox或IE。另一组眼睛将非常感激。

http://www.bootply.com/6xig9trE5C

http://www.bootply.com/6xig9trE5C

CODE:

码：

/*CSS*/
ul {
  margin: 0 auto;
  width: 270px;
}
li {
  float: left;
  height: 30px;
  list-style-type: none;
  text-align: left;
  white-space: nowrap;
  width: 50%;
}

input[type=checkbox] {
  border: 0;
  clip: rect(0 0 0 0);
  height: 1px;
  left: -2000px;
  margin: -1px;
  padding: 0;
  position: relative;
  width: 1px;
}
input[type=checkbox]:after {
  content: 'X';
  display: inline-block;
  height: 19px;
  left: 1969px;
  position: relative;
  top: -12px;
  width: 19px;
}
input[type=checkbox]:checked:after {
  content: 'V';
}

label {
  cursor: pointer;
  display: inline-block;
  font-size: 15px;
  height: 27px;
  line-height: 22px;
  padding-left: 32px;
  -khtml-user-select: none;
  -ms-user-select: none;
  -moz-user-select: none;
  -webkit-user-select: none;
  user-select: none;
  -webkit-touch-callout: none;
}

  

    

      Checkbox1
    
    

      Checkbox2
    
    

      Checkbox3
    
  

2 个解决方案

   
   
   Checkbox 1
 

/*CSS: (with the background use)*/
input[type=checkbox] + span {
  background: url("/img/checkbox.png") 0 0 no-repeat;
  display: inline-block;
  height: 19px;
  left: -12px;
  position: relative;
  top: 3px;
  width: 19px;
}

input[type=checkbox]:checked + span {
  background-position: 0 -32px;
}