The default settings (at least in my Figma) load a percentage for letter-spacing, but this is not allowed in CSS. For a less avid programmer this may be confusing, when trying to get it to work.
Either set the default to a px value, or add a warning inside the Inspect code
In CSS, letter-spacing does not allow for the use of percentages. So the interface is using something that is not supported in the code. Having to do the translation to ems yourself is just bad UX.
On top of that, you can’t set the root (R)EM size in Figma.
Figma’s letterspacing takes the precentage of the font-size in em.
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