What is the key to erase in html

Tell us what’s happening:

Your code so far

<h1>Hello world</h1>

Your browser information:

User Agent is: Mozilla/5.0 (Linux; Android 7.0; BND-AL10 Build/HONORBND-AL10) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/63.0.3239.111 Mobile Safari/537.36.

Link to the challenge:

How to erase in html

What do you mean? You mean how to delete?