To get ready, open the main.css file from the chapter9/start/app/www folder in your text editor. Note the difference in both file size and content between the two files--the file from this recipe, and the file from the preceding recipe. Obviously, removing comments can add significant improvements to our CSS file size, and ultimately to our page speed.
Page speed is important. You should always inspect your code with tools such as Google's PageSpeed Insights, available at:
developers.google.com/speed/pagespeed/insights/.
