How can I remove a child node in HTML using JavaScript?

Question

Is there a function like document.getElementById(\"FirstDiv\").clear()?

Answer 1

Modern Solution - child.remove()

For your use case:

document.getElementById("FirstDiv").remove()

This is recommended by W3C since late 2015, and is vanilla JS. All major browsers support it.

Mozilla Docs

Supported Browsers - 96% May 2020