Decision Use relative units in CSS for resizable content
acceptedUsing relative units improves accessibility by ensuring that text and content does not overlap when zooming web pages or changing the base font size.
Decision
Use relative length units (such as rem) for all applicable properties.
Exceptions
Absolute length units should be used for the following properties, instead of relative ones.
borderbox-shadowoutline
A unitless value should be used for line-height.
Consequences
Pages will be more accessible as fonts will respect browser preferences and font sizes will not compound with each other. The same is true for content with other relative units.