HTML minify does not minify CSS Menu Icon. Instead of FontAwesome, I use CSS Menu Icon, which is essentially an SVG file, inserted inline into the HTML page.
When I export this with “HTML Minify” option checked, it minifies all the HTML code except the SVG code for CSS Menu Icon
I know this isn’t really the answer you are looking for, and I would assume that the html minify in bss can’t minify svg (technically a different language?) but have you tried using something like https://www.svgminify.com/ and put that into the page?
HTML Minify in BSS is pretty basic. It just removes CR and LF characters. Nothing fancy So, I just manually can remove the new lines for the insert SVG (which is really inline XML, not different language).
I tried various rigorous minifying mechanisms and found that I save < 5% with rigorous minifying. For compressed files, the savings are even less: 2-3%.