Lazy loading is a strategy to identify resources as non-blocking (non-critical) and load these only when needed. Critical rendering path · CSS performance optimization
The border property specifies the border size and the border color of the loader. The border-radius property transforms the loader into a circle. W3Schools Tryit Editor · Badges · Try it Yourself
The loading attribute specifies whether a browser should load an image immediately or to defer loading of off-screen images until for example the user scrolls ...