Fix: Some FontAwesome Unicodes Show Up as Squares

If some of the unicodes work, but not others:

Check to see if the font icon you’re using is pro-only. Or maybe it’s more subtle than that: only the solid version is free. If so, make sure that you specify the font-weight to 600 or above to use the solid version:

font-weight: 600;
font-family: "Font Awesome 5 Free";

Also for reference, notice the difference in format:

// To use inside <div> directly:

// To use in div::after
div::after { content: "\f055"; }

// To use inside SVG (D3):

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