I've been reading the material design guidelines and it suggests:
For dark text on light backgrounds, apply the following opacity levels:
The most important text has an opacity of 87%.
I'm just curious as to why the primary text wouldn't use 100% opacity in this circumstance, which it does for light text/dark background?
Is there a intended eye health benefit, device display protection, or did the author of this just really like the number 87?
I've tried searching around keywords such as "material primary text opacity" or "material 87% text opacity" etc, but no success thus far...