On this project I work a lot with QA counting every pixel in my css-file. To finish my project I had to add new Chrome extension. It's a quite good and practical tool for Front-End Development. I hope, everybody will use this extension.
In addition I found a very good tool to compress HTML online. He it is: http://www.textfixer.com/html/compress-html-compression.php
This site features more useful tools and tricks, which I will use in a future.