The typing effect is one of the best classical animations that makes text appear letter-by-letter on the screen as if it is being typed as your watch. It is cumbersome for actual reading, but looks cool and old-school. And the best part is modern web designers started to use it again to enhance texts on websites. They can be achieved in many different ways so here are some examples of a typing effect using CSS and JavaScript.
Auto Typing Text

Simple Typing Carousel

CodeVember 11/08 typing effect

Typing Effect

Typing speed test

Auto Type! (Pure CSS)

Typing animation using CSS

Fly in, fly out

HTML / CSS text writing animation

CSS typewriter

SVG text typing along a spiral with JS

Profession.is type transitions

Text Animations

Typed.scss – Animating text using only CSS

Type Shuffle

Real-Time Typing Effect

CSS Typing animation

Pure CSS typing animation for a user on web_design

Type Carousel 2

Chained Typing Text Animations with TypeIt JS

Code-Typing a Blog Post

Typing Animation with inserted Elements

Type Animation: Staggered Slice Effect

pure CSS self-typing text

I code!

If you are interesting in CSS animation and JS manipulation then some of these examples should give you inspiration for creating your own effect(s).
However, and I don’t want to ride the hate train here, the code, css and markup for a good number of these demonstrate some seriously questionable practices. Not all of them, but some.