Icon font not working on subdomains of multisite

The problem:

Console log:

Cross-Origin Request Blocked: The Same Origin Policy disallows reading
the remote resource at xxx. (Reason: CORS header
‘Access-Control-Allow-Origin’ missing).

The solution:

Add the following header to your .htaccess file:

# https://wordpress.org/support/topic/font-awesome-not-working?replies=8#post-4921179
# Allow icon font to load on subdomains of WordPress multisite install.

<FilesMatch ".(ttf|otf|woff)$">
    Header set Access-Control-Allow-Origin "*"
</FilesMatch>

…before:

# END WordPress

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