What is the importance of aligning spacing with the font size?

Currently, I am in the process of setting the margin spaces for elements within a webpage.

In my review of the Bootstrap V4.0 documentation, I stumbled upon the fact that spacing is determined by the value $spacer, with $spacer defaulting to 1 rem. This led me to wonder why this particular value was chosen. Wouldn't it make more sense for spacing to adapt based on the display resolution?

Answer №1

Using a root size as the base for dimensions is simplified with the rem unit. For example, if the root em is set to 10 pixels, then 2rem would equal 20 pixels. By adjusting the root em size to 12 pixels, anything defined with 2rem would automatically increase to 24 pixels. This eliminates the need to manually change every instance of padding or margin based on the original 10-pixel value.


While employing relative units like rem and em results in a cohesive sizing approach for elements and fonts, it's not mandatory to use them exclusively. There are instances where a fixed value such as 15px may be preferred regardless of scaling factors.

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