A few years ago I went down the SVG sprites rabbit hole and came back with a list of methods, each broken in its own special way. The dividing line turned out to be in a different place than I expected. Caching is a solved problem: a sprite full of <symbol>s lives in an external file, gets cached like anything else, and still picks up your currentcolor. But it only works through an inline <svg> placeholder in your markup. Ask for that same graphic as an <img> or a background image and styling is off the table. No colors for...