RTF is not exposed when using navigator.clipboard.read()

[vmiklos]

The typical common format between applications for copy&paste on the desktop used to be RTF for a long time.

Reading https://w3c.github.io/clipboard-apis/#reading-from-clipboard, only HTML is suggested for rich text, but many applications have either no support for HTML paste or their HTML paste support is worse then RTF paste, because it wasn't a frequent codepath in the past.

I understand that exposing RTF means one more format to sanitize, but in case PNG and HTML is already sanitized, then RTF could be also allowed + sanitized.

For example, with all its problems, the old document.execCommand('paste') API used to allow reading RTF, and not even after we get permission from the browser, this use-case is broken, the consuming javascript must handle HTML instead. This is a problem in larger existing web applications, like Collabora Online.

Could you please consider adding RTF to the format list at "6.4.1. Reading from the clipboard"? Thanks.