[w3c/editing] Standardize Clipboard Source url (Issue #491)

ragoulik created an issue (w3c/editing#491)

Today when copy is performed from browsers (Ctrl/CMD+C or using writing using Clipboard APIs) 
there is no standardized, cross-browser supported provenance metadata—such as the source URL

Instead today browsers are using different clipboard MIME types to capture this:
Chrome/Edge uses: Chromium Internal Source URL
While Firefox uses: text/x-moz-url-priv

Security applications on different platforms are using these MIME types today to check if content on clipboard originated from a known malicious/untrusted website.

I want to propose standardizing this. That is, write the provenance metadata - source url to lets say "sourceUrl"


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