Why webkit line clamping does not work in firefox?

Question

I use this webkit line clamp, it works in Chrome, but not in Firefox. The following is the code:

{
  overflow: hidden;
  text-overflow: ellipsis;
  display: -we         


        

Answer 1

/----line clamp---/

.line-clamp {
    position: relative;
    height: 2.7em; 
    overflow: hidden;
}
.line-clamp:after {
    background: $white;
    bottom: 0;
    position: absolute;
    right: 0;
    float: right;
    content: '\2026';
    margin-left: -3rem;
    width: 1rem;
}

@supports (-webkit-line-clamp: 2) {
    .line-clamp {
        display: -webkit-box;
        -webkit-line-clamp: 2;
        / autoprefixer: off /
        -webkit-box-orient: vertical; 
        / autoprefixer: on /
        max-height:3.6em; 
        height: auto;
    }
    .line-clamp:after {
        display: none;
    }
}

/----line clamp end---/