Note that the js and css is not minified so it is readable. See tabs-example.js for the tab creation code and tabs-example.css for the css.

like the content in the tabbed areas are of different heights, or maybe the way the switch happens the current one is hidden for a brief second before the new one shows up and the content below it ...

on-hover-tabs is a component meant for a custom navigation bar like the above created via custom CSS. The CSS is also included in the repository. Its possible to ...