How do I Make Firefox Print a Background-Color Style?

Solution 1:

Its a browser setting. There is nothing you can do in your CSS. In Windows - File > Page Setup... > Print Background.

Solution 2:

I found a solution, it's a bit hacky, but with CSS pseudo elements you can create backgrounds using fat borders. Borders are printed even when "printing backgrounds" is off, just make them really thick! One note, Firefox sets all white font colors to black, so when you create a fake black background, Firefox still makes the text black, rendering the text invisible. Anyway here it is:

The HTML:

<div class="redBox">
  <div class="content">Black on red</div>
</div>

The css:

.redBox {
  /* o no, does not work with print */
  background-color: red;
}

@media print {
  .redBox {
     position: relative;
     overflow: hidden; /* this might not work well in all situations */
  }
  .redBox:before {
     content: '';
     position: absolute;
     top: 0;
     right: 0;
     left: 0;
     bottom: 0;
     /* and here it is, the background color */
     border: 99999px red solid;
     z-index: 0; /* was required in my situation */
  }
  .redBox * {
    /* was required in my situation */
    position: relative;
    z-index: 1;
  }
}