You may choose to press your 'tab' key to navigate down through the buttons and links on this web page. Conversely, if you hold down your 'shift' key while pressing the 'tab' key, you will be able to navigate back up through the web page in reverse.
When a tabbed-to button has a dashed, aqua or red border surrounding it, or a 'text-link' has a dashed, red border surrounding it, or an image a dashed, red border, you can press your 'enter' key, and doing so will mimick the 'clicking' of that same button or link using your cursor and mouse.
And any time you wish, you may 'click' on (or navigate to via 'tabbing') the 'TS' button on the left-hand side of your viewport, that will open up the 'Tabbing Stats' popup window—and you will be able to moniter the status of accessibility features
that have been incorporated into this web page.
You can also reposition on the web page the opened 'Tabbing Stats' popup window using only your keyboard!