Birds use language like humans, joining specific ‘chirrups’ together to form complex sentences ... “This study demonstrates that syntax is not unique to human language, but also evolved ...

We rather fear that live syntax validation as you hand-code HTML is one answer to this, but on its own isn't sufficient. But ...

We can also add drop-down menus to our HTML forms. We can use the select element to implement these drop-down menus. Input choices are in “option” elements as shown in the example below.