Minification consists of minimizing the amount of data and thus the weight of the bearer file by removing the elements from which the drive machine can be dispensed (typically : spaces, line breaks and comments). CSS stylesheets can be minified.
Objectives
Minimize amount of data to download
Increase performance
Decrease the energy impact linked to the consultation of the digital book
Implementation
Remove unnecessary spaces and comments in CSS files using dedicated tools.
Control
Manually check within all CSS files that no line, comment, indentation or line break is available.
Or identify the list of non-minified CSS files using development tools (browsers, online tools, etc.)
references : General ecodesign of digital services
(6. Does the digital service have compression techniques in place on the total of the transferred resources that it has control?)