I have a .html document with CSS and Javascript inside of document (no external files). Is there some online tool that would minify document and Javascript to some very small footprint? I saw many scripts kind of unreadable, where all variables and function names are replaced with one-letter names, etc. Please advice.
Try http://prettydiff.com/. It offers automatic language detection and can minify html, css, and javascript. This tool presumes that script tags without a mime type or with a javascript relevant mime type must contain either javascript or nothing. Likewise, style tags without a mime type or with the "text/css" mime type are presumed to contain CSS. The CSS and JavaScript are minified accordingly. The tool itself is written in javascript. There is no reason you should have to use more than one tool.