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I've been trying to work out why when I specify Roboto Thin as <h1> it doesn't display properly.

I tried turn the Bold type to False, but that doesn't work, there is a third option and that's to select nothing.

Colin

Correct, the font weight should be empty because Roboto Thin has the font-weight in its name (thin = font weight 100).
bold/true = font weight 700
bold/false = font weight 400