[hidden] rule breaks hidden=until-found

[mmoskal]

Describe the bug
Recent Chromium supports hidden="until-found" attribute which allows for Ctrl-F search in hidden accordions, see https://developer.mozilla.org/en-US/docs/Web/API/HTMLElement/hidden and https://developer.chrome.com/docs/css-ui/hidden-until-found

purecss adds "display:none !important" to "[hidden]" which breaks it:

pure/src/base/css/base.css

Line 20 in 203b964

[hidden] {

It seems that "display:none" without "!important" also breaks it.

I'm not sure why this rule is there in the first place.

To Reproduce
Steps to reproduce the behavior:
Use recent Chrome or Edge
Head to https://codepen.io/web-dot-dev/pen/JjMxmom
Click on white demo area
Search for papaya -> works
Reload
Add on top of HTML
Click on white demo area
Search for papaya -> doesn't work