Polyfill is not applied to content CSS property

[vliubezny]

As image URL could be assigned to content property the polyfill should be applied to CSS snippet like this:

.content-view.canvas-overview .content-view.canvas > footer > .view-related-items > .view-shader {
    content: image-set(url(../Images/DocumentGL.png) 1x, url(../Images/[email protected]) 2x);
}