WordPress default theme css units

Is there a specific rule the default WordPress themes follow for CSS units?

I see em's on some font sizes and rems on others and px on certain places.

Referred the following links but I couldn't find the actual reference to the rule they use for their CSS units: why does twenty eleven theme mix up the css measurement units? Why do Wordpress default themes specify fonts in so many places?

Edit: By rule, I meant, for eg: Always follow the unit system of - px for borders, em for spacing etc

Topic theme-twenty-seventeen theme-twenty-sixteen css theme-development Wordpress

Category Web

1
answered at

I would suggest looking into the ways that the various units function. There would rarely be a case where you would use one unit exclusively. I generally use ems, rems, and %.

This article may help get you started: understanding and using rem units in css

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