The only ‘unit’ (for font-size etc) provided in the Wix Text Editor interface is ‘px’ (pixels) .
It would be great if OTHER options were also available - ‘em’/ ‘vw’/ ‘points’/ etc. - as that would allow a user to easily make the webpage more ‘responsive’ to different sizes of ‘viewports’ or screens.
The same flexibility would also be a great addition to the Database Rich Text fields.