It looks like having escaped Unicode in a CSS content attribute is treated as a security violation even though it's a well known technique . Are there any tricks to doing this? Using unicode characters saves me the hassle of making icons, managing tiny external assets, and saves on requests. (23:01:54.102 Potential CSS security violation; character sheet template styling thrown out.1 app.js:43:25266) Another possibility is to base64 encode a SVG (or PNG if I have to) and use it as a background image. Is this is something that Roll20 will also allow?