CSSbackground-color: #f00
CSSbackground: linear-gradient(#f00, hsla(0, 100%, 50%, 1))
CSSbackground: radial-gradient(#f00, hsl(0, 100%, 50%))
CSSbackground: url(no-profile.png)
CSSbackground: url(embedded-profile.jpg)
Canvasc.fillStyle = '#f00';
c.fillRect(0, 0, 200, 200);
SVGfill: rgb(255, 0, 0)
Image<img src="no-profile.png">
Image<img src="embedded-profile.jpg">