Description
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font-smoothing
I've been debating whether or not we should turn on font-smoothing by default. The css property makes text look better on webkit/mozilla browsers but it also results in some changes that might not be desirable (e.g. white text on dark backgrounds is more faint). For an end-user it's easier to add it than remove it in custom CSS so I've been hesitant to make it a MUI global property but it's frustrating when the default text with MUI doesn't look great out of the box.
So far I've been considering 1) making font-smoothing a global property of MUI 2) making font-smoothing a local property for certain elements (e.g. buttons) 3) documenting the issue and letting the developer decide.
Any thoughts?
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letter-spacing
The current letter-spacing in MUI is based on Google's recommendations for Roboto but it isn't necessarily ideal for other fonts. Here's the difference between turning on/off MUI letter-spacing for buttons using MUI's default font (Helvetica Neue):

And here's the difference with font-smoothing turned on:

In keeping with the lightweight/minimalist spirit of MUI, I've been considering turning off the custom letter-spacing and leaving it up to the developer to choose the letter-spacing that works best for their font choice. Any thoughts?