Sounds like you want this:

• https://github.com/nwutils/find-in-nw

It will also add dom wrappers, but removes them when done.

The only other way I can think of doing what you want would be:

1. Detect the x,y coordinates of text on the page
   • Good luck. Text reflows based on layout and browser width. If the text is not wrapped in an element I'm not sure how to get it's coords or size (bounding box/rect)
2. Create an absolute positioned element above it with a mix-blend-mode: darken
   • This would work for dark text on a background lighter than your highlight. So like white text on a black background with a yellow highlight. But if it's white text on a black background you'd need mix-blend-mode: lighten. Also, good luck determining the background color and text as those can be stored on basically anywhere in the DOM.

You're better off just using that library, or finding a different way approach or define your problem space.