img srcset => Enable a responsive images solution by providing the browser multiple resources in varying resolutions for a single image.
Arrow function => The arrow (=>) takes the place of the function keyword
Box Alignment => CSS properties for aligning boxes within their container. Allows for true vertical centering among other features.
DOM3 Keyboard Events => KeyboardEvent: keydown, keyup
Default parameter => Allows formal parameters to be initialized with default values if no value or 2 is passed.