[spdustin]

One note: For truly "responsive" text (and other measures, like padding/margins), I often use relative units of measurement. At the very least, rem/em, but more and more I'm using viewport¹ (including dynamic) and container query² units. I'm not your target market, and I know that owning the renderer makes this request more complex that it would seem, but I thought I'd point it out just in case you think it should be on your radar.

1) https://caniuse.com/viewport-units, https://drafts.csswg.org/css-values/#viewport-relative-lengt... (includes dynamic and inline/block lengths)

2) https://caniuse.com/css-container-query-units, https://www.w3.org/TR/css-contain-3/#container-lengths

[izakfr]

This is something we are going to add for sure. Ideally, we will support any unit (em, rem, %) you can use in CSS for any property we expose like padding or font-size.