Body Unit

VW proportional font size

VW font sizes don't meet accessibility requirements because they can't be zoomed or increased from the browser font size settings. If the max width container and other elements do respect the user's font size preference, using VW units will cause layouts to break when users decrease their font size preference.

REM proportional font size

This uses javascript to convert the body VW font size to the equivalent REM unit. Because they're proportional, these elements still can't be zoomed, but they do respect the user's font size preference (a current minimum accessibility requirement). Add this javascript to the project settings head code, and it will run without waiting for stylesheets and images to finish loading.