If I want style sheets for different color themes, how can I keep canvas font and line colors in an external CSS file?
I could make hidden dom elements and use them as varaibles.
I could just use javascript to read the current theme and set the colors using javascript variables but then it defeats the purpose of css files. I also want someone else to edit the styles and colors without having to do javascript.
Is there no way to store a setting in a css file and easily read it with javascript (no ajax or jquery)?
Canvas drawing is independent of CSS. You set fonts and colors using Canvas API methods, not by CSS styling. The best I can think of as a counterpart to an external CSS file is an external JavaScript file where you just assign values to variables used in your code for drawing on canvas. That file could be made very simple, just assignments, so it would not require any substantial understanding of JavaScript to edit it.