Here is some code which i a short while ago wrote. I think that it offers a basic clarification of combining class/ID names with pseudoclasses. These are definitely all identified in CSS as at-principles. They're Specific Recommendations to the browser, circuitously linked to styling of (X)HTML/XML elements in Internet paperwork https://ilovebookmarking.com/story19307262/rumored-buzz-on-prestashop-preloader-page-loading-image-page-loading-animation-preloading-screen-loading-page