Force Background Color Printing on Firefox

Question

I'm using the Barby ruby gem which adds a handy way to render barcodes as HTML.

Barby renders a table with td backgrounds on or off based on the code passed to it. This works pretty well because I don't want to generate and store an image file for every record I need a barcode for.

The major browsers don't print background colors by default and I need the barcode to print without making the user change a print option on their local system.

I'm not sure how to accomplish this with Firefox. With webkit (Chrome and Safari), it's pretty easy:

td { 
  background: #000 !important;
  -webkit-print-color-adjust: exact;
}

Feverish Googling hasn't really gotten me anywhere: This question is a few years old and I haven't found anything newer so I figure I'd pose the question again. Fat borders also won't really work because if the relationship between the bars change, it'll change the data contained in the code.

Answer 1

This is beginning to work in Firefox (at least version 48.0.2) with the "color-adjust" property.

td { 
  background: #000 !important;
  -webkit-print-color-adjust: exact;
  color-adjust: exact;
}

I see a minor bug or two in my particular project, but the background colors are showing up!

Answer 2

This works for me:

@media print {
    body {
        -webkit-print-color-adjust: exact; /*Chrome, Safari */
        color-adjust: exact; /*Firefox*/
    }
}