What is wrong with my code

Question

https://code.sololearn.com/W05pQXQOlymv/#js

Whenever I run the code I get the error: Uncaught TypeError: Cannot set property 'innerhtml' of null
Line: 1

Answer 1

You don't have an HTML element that's named 'demo.' So place id="demo" on whatever element you're trying to reference.

Answer 2

<div id="demo"></div>

Answer 3

Could you show an example of how to go about doing this?