Zero-JS. Respects prefers-reduced-motion. High-contrast and print friendly. Add class encore-curtain to links or headings.
Hover or focus me to open the curtain
Another example: accented text span in a sentence.
Copy-ready link tag:
<link rel="stylesheet" href="https://surprise-lab-mirror-proofs-c7a16b.gitlab.io/proofs/variants/encore-curtain/encore-curtain.css" integrity="sha256-0FPkzDuhrpEE4M0SZjflOHph9U1PZxiXQvRiABwpyA0=" crossorigin="anonymous">