Font Awesome 5 font-family issue

Question

I integrated Font Awesome 5 in a project with bootstrap 4. When I recall a font via CSS it does not work. with Font Awesome 4 the code was as follows:

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Answer 1

Requiring 900 weight is not a weirdness but a intentional restriction added by FontAwesome (since they share the same unicode but just different font-weight) so that you are not hacking your way into using the 'solid' and 'light' icons, most of which are available only in the paid 'Pro' version.