This page is for developing the Popup modal.
Because the modal is a Symbol that appears on every page, the root div 'modal' has the display attribute 'display-none' as its default (otherwise it gets in the way of content on the page). The code controlling the popup when the page loads overrides the 'display-none' command.
To view the modal for further development set the div called 'modal' to 'display'.
This message is not part of the modal.