One Mathematical Cat, Please! An Interactive Slide Show

HTML (HyperText Markup Language), the language of the World Wide Web,
is not set up to represent mathematics.

You can't get something as simple as a ‘horizontal fraction’ using only HTML:

$$\frac{a}{b}$$ All you can get is a ‘diagonal’ fraction:

$$a/b$$ ... unless you want to use pictures (static images):

$a horizontal fraction$

Pictures are slow to load.
You need lots of files if you have lots of equations.
You can't search pictures for information.
And, you can't create dynamic, randomly-generated, interactive mathematics exercises using static pictures.