/* should not generate diagnostics */
let a = <Html lang="en-babab" />;
let a = <html lang="en-US"></html>;
let a = <html lang="en"></html>;
let a = <html lang={lang}></html>;
let a = <html lang="nb"></html>;
let a = <html lang="nn"></html>;
let a = <html lang="zh-Hant"></html>;
let a = <html lang="zh-Hans-CN"></html>;
