Why is this an issue?

Having duplicated font names doesn’t help to read the font declaration and may be an indicator the author of the line was not sure how to configure it. This rule raises an issue when font or font-family properties contain a duplicated font name. This rule ignores $sass, @less, and var(--custom-property) variable syntaxes.

Noncompliant code example

a {
  font-family: 'Georgia', Georgia, serif; /* Noncompliant; 'Georgia' is duplicated */
}

Compliant solution

a {
  font-family: Georgia, serif;
}