The PacemFxListElement aims to gap the distance between CSS and JavaScript: there are many scenarios (involving nth-child, nth-last-child, ... selectors) that are impossible to manage using a CSS-only approach.
This simple webcomponent allows the developer to inject logic on newly added item-elements, on both static and dynamic lists:

["A", "B", "C", "D", "E", "F", "G", "H", "I", "J", "K", "L", "M", "N", "O", "P"]

The result above could have been obtained also by intercepting the PacemRepeaterElement's RepeaterItemCreatedEvent event.