[samatman]

I don't know what the site author did to make it so the zoom button doesn't adjust the font size but I implore anyone similarly tempted: please don't do this.

[_Microft]

It's worse. The size of the text depends on the height of the window. Resize the window and it quickly becomes illegibly small.

[vezycash]

If you're using chrome or it's derivatives, install the extension ZOOM TEXT ONLY.

For Firefox no extension is needed on desktop. Google how to do it. For Android Firefox, I use the add-on called LEGIBILITY.

[sm4rk0]

There's built-in "Reader View" in Firefox (both desktop and mobile).

https://support.mozilla.org/en-US/kb/firefox-reader-view-clu...

[Zancarius]

I think it's the viewport "user-scalable=no" meta tag value?

That's a terrible thing to do to people who have poor or low vision, and the font size is small enough that it's almost a problem for people who have otherwise decent vision but require reading glasses!