dom-to-image/spec/resources/pseudo/style.css

Generates an image from a DOM node using HTML5 canvas and SVG

.with-before::before {
    content: 'JUSTBEFORE';
}
.with-after::after {
    content: 'JUSTAFTER';
}
.with-both::before {
    content: 'BOTHBEFORE';
}
.with-both::after {
    content: 'BOTHAFTER';
}

#dom-node {
    background-color: white;
    font-family: sans-serif;
    font-size: 20px;
}