EM Side by Side Example:

Everything in this Example have a value of 1em or less even when it shouldn't

Then each container below has a
font-size: 100% || 200% || 300%;
applied to it to it's effect (affect?) Hope this helps someone :)

100% EM

Example: Parent is set at font-size: 100%

Everything in this Section is 1em or less

200% EM

Example: Parent is set at font-size: 200%

Everything in this Section is 1em or less

300% EM

Example: Parent is set at font-size: 300%

Everything in this Section is 1em or less