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

Question

I have some simple CSS:

#someElement {
    background-color:black;
    color:white;
}

It looks ok in the browser, but when I go to print it

Answer 1

For show background colors in firefox & IE

@media print {
  body{
    -webkit-print-color-adjust: exact; /*chrome & webkit browsers*/
    color-adjust: exact; /*firefox & IE */
  } 
}