https://developer.chrome.com/blog/web-custom-formats-for-the-async-clipboard-api
Web custom formats for the Async Clipboard API | Blog | Chrome for Developers
Web custom formats let websites read and write arbitrary unsanitized payloads using a standard format applications can opt in to support such payloads.
async clipboard apiwebcustom
https://blog.tomayac.com/2020/03/20/multi-mime-type-copying-with-the-async-clipboard-api/
Multi-MIME Type Copying with the Async Clipboard API
Mar 20, 2020 - The personal blog of Thomas Steiner
async clipboard apimime type