* Added labels to highlight boxes for both Headings and Landmarks
* Heading highlight label displays the HTML element name indicating heading level
* Landmark highlight label displays the ARIA landmark role
* Changed the 'Highlight automatically on selection change' checkbox default to be checked

* Improved the logic for managing the state of the 'Highlight Selected' button

* Updated layout of sidebar with list-controls component

* Fixed bug relating to list navigation

* Added auto-highlight feature
* Improved highlighting with bi-color outlines

* Fixed minor highlighting bug

* Updated the description and added screenshots