retina-dom-to-image/spec/resources/fonts/web-fonts/rules-relative.css

A fork of the dom-to-image library that outputs an image for higher DPI screens

@font-face {
    font-family: 'Font1';
    src: url('../font1.woff') format('woff');
}
@font-face {
    font-family: 'Font2';
    src: url('font2.woff2') format('woff2');
}