I’ve had the need to programmatically change the fragment part of a URL

That’s the part after the # hash symbol.

I was on index.html and I wanted to change the URL to something like index.html#second.

The reason for this was a bit unusual, but let’s say I had a table of contents but the links weren’t working as I wanted.

Here’s how I did it:

window.location.hash = 'second'