//Duplicate `name` property
<Hello name="John" name="John" />;

//Case where property is repeated more than twice
<Hello name="John" name="John" name="John" />;

//Case with two duplicates
<Hello name="John" name="John" lastname="Doe" lastname="Doe" />;

<label xml:lang="en-US" xml:lang="en-US"></label>
