no-data-uri-src

Disallow data-URI font sources in @font-face.

Rule catalog ID: R010

Targeted pattern scope

• url("data:...") entries in @font-face src.

What this rule reports

• Any data URI source used for font files.

Why this rule exists

Inlining fonts grows stylesheet size and delays parsing.

❌ Incorrect

@font-face {
  src: url("data:font/woff2;base64,AAAA") format("woff2");
}

✅ Correct

@font-face {
  src: url("./inter.woff2") format("woff2");
}

Further reading

• Web.dev: optimize webfont loading