-For custom usages, add a class "b-lazy" along with a "data-src" attribute
-referring to an expected image or iframe URL, or to any supported element:
-IMG, IFRAME or DIV/BODY, etc.
-Non-media element, DIV/BODY/etc., will have background image lazyloaded instead.
-
-Wrap the parent container with [data-blazy attribute containing the expected
-options to limit the scope, or for simple need without aspect ratio. Add extra
-class .blazy to support aspect ratio with multi-serving images.
-And load the blazy library accordingly.
-