Here is some code which i just lately wrote. I feel that it offers a essential clarification of mixing class/ID names with pseudoclasses. These are definitely all recognised in CSS as at-regulations. They are Distinctive Recommendations for that browser, not directly connected to styling of (X)HTML/XML elements in Website files https://www.presta-addons-modules.com/en/seo/prestashop-google-instant-indexing-api-integration.html