Instead of using tab to navigate through elements on this page, try using enter or ↵. Also try reverse navigation with shift-enter. Using the enter key is configurable, and multiple keys are supported - read more on the project page.
In this demo, all elements inside of the <form data-plus-as-tab="true">
can use enter. To keep some of the desired enter logic, both
the <textarea> and <button type="submit">
elements have data-plus-as-tab="false" attributes added to them to
use the normal browser behavior.