WordPress core ships css files in both source and minified form. E.g.
wp-includes/css/admin-bar.min.css. Does anyone know exactly what tool they use to do the minification? I just tried using the web-based tool at
cssminifier.com on the
admin-bar.css file in core 4.4.2, and it produces different output from the
admin-bar.min.css file that ships with 4.4.2. I want to make some changes to the css, and I first want to verify that I can minify the source the same way that WordPress did it, before making changes to the source and then minifying the result.
Please no comments about not changing core files. I know all about it, and have been maintaining a small number of core file changes in git since version 3.7 up through version 4.4.2 (in addition to a large number of filters and actions). I have a strong preference to customize "the right way", but sometimes it's not feasible :-)