Anyone know why the base font size is specified with a calculation in the head of theme.liquid?

[galenking]

Is there anyone on the Shopify Dawn team who was part of the original typography design for Dawn? Is it just me or is the CSS unusually complex for the typography?

For example, why is the base font size specified with a calculation in the head of theme.liquid? https://github.com/Shopify/dawn/blame/afa073abd018f78e1b9883dd1fba1b5364b1e28a/layout/theme.liquid#L229

Is that because it needed to pull from the theme settings? Surely there’s a more elegant way to do this.