firefox - SVG in css pseudo-class does not alway appear on print page -


i creating stylesheet print media includes inline svg content of element's pseudo-class (i.e., ::before, ::after).

when testing in chrome, seems work fine, when page first loaded in firefox , safari, svg element not appear in print preview. appears on subsequent attempts.

i not sure going on, if had guess, conjecture be: when page hasn't been cached there latency rendering pseudo-element happening concurrently browser creating print page.

i curious know why happening, , if there solution svg pseudo-element can used reliably.

here stripped down code example. please see if can reproduce issue:

var button = document.queryselector('button');  button.addeventlistener('click', function () {  	window.print();  });
div {      text-align: center;  }  button {      margin: 2em;      padding: 1em 2em;  }  @media print {      button {          display: none;      }      div::before {          content: 'pseudo-elements';          font-weight: bold;          margin-top: 1em;        }      div::after {          position: relative;          display: block;          margin-top: 1em;          content: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='100' height='100'><circle cx='50' cy='50' r='50' /></svg>");      }      }
<div>      <button>       print      </button>  </div>

i can repro.

it seems bug loading of svg, guess same image.

one workaround load outside of @print rules display: none : 

var button = document.queryselector('button');  button.addeventlistener('click', function() {    window.print();  });
div {    text-align: center;  }  button {    margin: 2em;    padding: 1em 2em;  }  div::after {    display: none;    content: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='100' height='100'><circle cx='50' cy='50' r='50' /></svg>");  }  @media print {    button {      display: none;    }    div::before {      content: 'pseudo-elements';      font-weight: bold;      margin-top: 1em;    }    div::after {      opacity: 1;      position: relative;      display: block;      margin-top: 1em;    }  }
<div>    <button>      print    </button>  </div>

an other 1 preload via js before hand.


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