css - Dynamic & Responsive Trapezoid Text Div -


this question has answer here:

i'm stuck on special design, need effect, keeping in mind text changed (since it's wordpress website) on 1 or many lines. http://postimg.org/image/ibqntp9t1/ achieved effect using pseudo elements , here code : css:

       .box {         background-color: #000;     }      .box:before {         content:'';         border-top: 100px solid transparent;         border-right: 28px solid #000;         width: 0px;         height: 0px;         position: absolute;         top:0px;         left: -13px;     }   

the problem when content changes (example: 1 line of text), height of "before" thing not change ... ? thanks

edit: solution provided below isn't working (not working on firefox)

if values in em pseudo-element border triangle react changes in font size.

.box {    background-color: #000;    color: white;    display: inline-block;    position: relative;    line-height: 2em;    padding: 0 1em;    margin: 0 2em;    vertical-align: top;  }  .box:before {    content: '';    border: 1em solid transparent;    border-right-color: #000;    border-bottom-color: #000;    width: 0px;    height: 0px;    position: absolute;    right: 100%;    top: 0;  }  .larger {    font-size: 24px;  }
<div class="box">standard</div>  <div class="box larger">i'm larger</div>

building on excellent answer @stewartside, clip path can applied pseudo-element.

.box {    background-color: #000;    color: white;    display: inline-block;    max-width: 250px;    position: relative;    line-height: 2em;    padding: 0 1em;    margin: 0 2em;    vertical-align: top;  }  .larger {    font-size: 24px;  }  .box:before {    content: '';    background: inherit;    width: 2em;    height: 100%;    -webkit-clip-path: polygon(50% 0%, 100% 0, 100% 100%, 0% 100%);    clip-path: polygon(50% 0%, 100% 0, 100% 100%, 0% 100%);    position: absolute;    right: 100%;    top: 0;    margin-right:-1px; /* tweak due antialias issue ? */  }
<div class="box">lorem</div>  <div class="box larger">lorem ipsum dolor sit amet.</div>


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