Let's party
This is an animation with the box-shadow property and a font I obtained from Google Fonts. All of it put together is probably less than 10 lines of code. The most difficult part was choosing the right font-size.
I've used the contentEditable attribute to make the text editable by the user, give it a shot (I've scoped it to the neon-like text). The text has very few glyphs (basic letters, numbers and punctuation signs), so don't try to make fancy text with it because it will be a disappointment.