[Teacher:] Let me demonstrate the order of the text headings.

Here is a mysterious giant box. Within it...

... is a mysterious large box. Within it...

... is a mysterious medium box. Within it...

... is a mysterious small box. Within it...

... is a mysterious tiny box. Within it...

... is a mysterious microscopic box. Within it...

[Teacher:] ( Opens the mysterious microscopic box )

.

[Student:] But there's nothing inside!

[Teacher:] Or so it seems: what you do not see is the essence which allows the mighty Web to exist. We call this essence ... html. Here, my student; let me show you...