What does `title` do in the preamble?

Hi! What does the title field of the preamble do? It doesn’t seem to display in the compiled file, nor does it change the filename.


The title field of the preamble defines the lesson’s title that is shown in a browser’s title bar or a page’s tab. For example, if the title is set to “lab 5”, students would see something like this in their browser when opening the lesson: