A script to turn visited links red

I have Chrome 80 with MTS. Unlike Firefox, Chrome doesn't use another color to show visited links. Or maybe MTS doesn't.
With previous versions of Chrome, I used a script, actually a bookmark, to turn visited links red. It's my own way of keeping track of what I had clicked on, as I don't use Tracker.

I don't code, but someone on another forum wrote this for me a few years ago as a bookmark, and I would click it when I fired up MTS.:
`beforeend`, `<style>a:visited {color: #B22222 !important;}</style>`);

But Chrome v. 80 broke it. Anyone know how to tweak this?

 

I can't get a bookmarklet to work either.

Open the console log (ctrl+shift+j), paste the following code into the console and hit enter.

Code:

document.head.insertAdjacentHTML('beforeend', '<style>a:visited {color: red !important;}</style>');

 

It worked! But it also says "undefined" underneath, and wiped it off. When I closed Chrome, then re-opened, it was gone.