Highlight searchresults and close button

Question

https://code.sololearn.com/WSrEXLmHXLOZ/?ref=app
Need help to make highlighted match from search. Preferrably background color change.
The code til now opens every parent detail element that has a text match within it. Background color shpuld change back when new search has been done.
I also need a "close" button for the opened details.

Answer 1

use filter on keydown to get the search result.
addEventListener(onkeydown)
on input tag and filter the results based on the input