function f() {
    return <div string_literal="a" expression={1} novalue el=<a/>></div>;
}
<div dashed-name='test' use:validate="abcd" />;
<div use-dashed_underscore:validate="ahaha" />;
<div multiline-string='test
  continues here' />;
<div invalid-unicode-escape="\u10000\u20000" />;