I'm trying to reference a font file saved as a data URL (trimmed below for readability).

<link type="text/css" rel="stylesheet" href="data:application/octet-stream;base64,T1..">

My style-src content security policy includes the unsafe-inline directive. Why am I still getting the following error?

Refused to load the stylesheet 'data:application/octet-stream;base64,T1..' because it 
    violates the following Content Security Policy directive: "style-src 'self' 'unsafe- 
    inline' https://localhost:* https://127.0.0.1:*".