Any command that references a document object before the browser has parsed the HTML code will result in an error because those objects do not yet reside in memory.

Question

Quizplus · Accepted Answer

This is because the browser needs to parse the HTML code and construct a Document Object Model (DOM) before it can create the corresponding document objects in memory. Any script or command that attempts to reference these objects before they exist in memory will result in an error.

Any Command That References a Document Object Before the Browser