Provide Data URL resource
Here is an example. You can a small red dot, which was found here.
https://data-url-4in25matdvg0.runkit.sh/?d=data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAUAAAAFCAYAAACNbyblAAAAHElEQVQI12P4//8/w38GIAXDIBKE0DHxgljNBAAO9TXL0Y4OHwAAAABJRU5ErkJggg==
This server will help you in environments you can not use Data URL for some reason.
Because base64 encoding can contain "//". That may be converted to "/" in some browsers.