Implement link in left hand navigation panel to top of page. Maybe?

I was reading script-async-defer, and I started to navigate backwards up the page using the navigation panel on the left. I have used the navigation panel before to go down the page, but I prefer to use the mouse wheel and keep my pointer in the middle of the screen.

However, this time I decided to scan the article in reverse and I noticed that it was useful for reinforcing what I had just read. However, I could not get back to the very top.

I notice that the only place that href="#" is used in the source code is in the code examples.

Maybe, a link at the top of the navigation panel to the top of the page would be useful. For example:
<a href="#">Scripts: async, defer</a>

And maybe another one at the bottom of the content:
<a href="#">Back to top of page</a>

I can find a use case for both buttons.

• The link in the navigation panel would be used as described above.
• I would use the Back to top of page link in this way, for example:
  1. I would scan the page relatively quickly using my mouse wheel, until I reached the bottom of the page.
  2. At the bottom, I would press Back to top of page and then read the whole page again more slowly.