Lib: Add comment to lazyload.ts

src/lib/lazyload.ts

@@ -14,7 +14,12 @@ const getObserver = () => {
   });
 };
 
-// This is used as an action on lazyloaded elements
+/**
+ * Use this as an action on elements that should be only loaded when moved into view.
+ * Note that if the element's size is 0 on mount, multiple elements could be in-view that
+ * would be out-of-view with their correct size.
+ * This happens for <div> elements without content for example.
+ */
 export const lazyload = (node: HTMLElement) => {
   // The observer determines if the element is visible on screen
   getObserver();