Answer:
Doctype Declaration
Step-by-step explanation:
In order to make sure that it renders correctly in a wide range of browsers, a Doctype Declaration needs to be added to the top of the HTML code. This declaration basically makes sure that the web browser knows how the code was written so that it can correctly read it. This is used because many web browsers use different default settings for reading code and can sometimes not display code that was not designed specifically for that web browser unless otherwise specified.