Clipboard data types

[mems]

• Firefox: Copy text/uri-list is only supported for GTK. On macOS it added as UTI org.mozilla.custom-clipdata.
  Pasted TIFF data (UTI public.tiff) is converted as PNG data (see clipboardData.items). Metadata ("Creator Tool" and "Modify Date") are stored as XMP.
  Support text/plain (UTI public.utf8-plain-text), text/html (UTI public.html), text/rtf (UTI public.rtf).
• Chrome: Copy custom type is added as UTI org.chromium.web-custom-data. Pasted TIFF data (UTI public.tiff) is converted as PNG data (see clipboardData.items). Metadata are not kept.
  Pasted PDF data (UTI com.adobe.pdf) is converted to PNG data (but rendered incorrectly).
  Support text/plain (UTI public.utf8-plain-text), text/html (UTI public.html), text/rtf (UTI public.rtf).

text/plain, text/html, text/richtext, image/png

Specs:

If format equals text, change it to text/plain.
If format equals url, change it to text/uri-list.

— HTML 5.2: 5. User interaction

See also:

• Copy binary data to clipboard via Javascript - Stack Overflow
• #11526 (dataTranfer & clipboardData research) – CKEditor
• Chromium sources: ui/base/clipboard/custom_data_helper_mac.mm - chromium/src.git - Git at Google
• Firefox sources: nsDragService::GetData, nsDragService::IsDataFlavorSupported, nsDragService.mm, nsITransferable.idl
• ClipboardViewer macOS app sample
• Clipboard Viewer.app bundled in XCode Auxiliary Tools package (at least with XCode 7 Auxiliary Tools). See http://adcdownload.apple.com/Developer_Tools/Auxiliary_Tools_for_Xcode_7/Auxiliary_Tools_for_Xcode_7.dmg
• #132104 Stored XSS on team.slack.com using new Markdown editor of posts inside the Editing mode and using javascript-URIs - HackerOne - see the Python script used to fill the clipboard data for macOS