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Web custom formats for the Async Clipboard API (developer.chrome.com/blog/web-custom-formats-for-the-async-clipboard-api/) allow developers to write arbitrary data to the clipboard. Here's @polx demonstrating this for copying
application/mathml+xml
andapplication/mathml-presentation+xml
🧮📋 in the quoted tweet ⤵️. x.com/polx/status/1572015482068238337