I'm really counting on your help in this one. I searched a lot and found no solution. I want to have a custom icon for my plugin in admin menu, and I want it to integrate well with the color scheme.
I looked here https://codex.wordpress.org/Function_Reference/add_menu_page
Under $icon_url
(WP 3.8+) If 'data:image/svg+xml;base64...', the specified SVG data image is used as a CSS background
However, if I put a URL to an SVG icon there, all I get is an img with SVG in its src attribute, so it doesn't integrate at all with the color scheme. It's supposed to be a CSS background.
Also, I don't understand this data:image/svg+xml;base64...
What does it mean exactly?
I tried embedding inline SVG in the $icon_url
but obviously, it won't work, but I just had to try it.
Dashicons are not an option, there's no icon there suitable for my project.