We'll create fresh WordPress site with LH CSS Lazy Load installed. You have 20 minutes to test the plugin after that site we'll be deleted.
Javascript has a HTML based method for deferring and asynchronously loading files, namely script Defer and script Async. Unfortunately these HTML solutions do not work for CSS files.
But do not worry, this plugin allows you to lazy load yous css files. Thus speeding up your initial view experience for visitors and search engines.