Re: [w3c/editing] Add revised OS custom format naming. (#316)

@snianu commented on this pull request.



>  
-On Linux, ChromeOS, and Android, MIME types are often used (though Linux and ChromeOS don’t have strong recommendations regarding clipboard format naming conventions). Therefore, a MIME type `"custom/format"` will be transformed to `"application/web;type="custom/format""`. Note that the pickling prefix `"application/web;type="` precedes the transformed format name, which has quotes around the format name.
+Native apps will need to read the web custom format map and parse its payload as an alternative to `EnumFormats` on Windows to fetch the mapping of the custom MIME type to web custom format. It can then request for the web custom format corresponding to a particular MIME type of interest. This also helps in [Delayed Rendering](https://docs.microsoft.com/en-us/windows/win32/dataxchg/clipboard-operations#delayed-rendering) of formats on Windows where the native app just provides an indication to the clipboard that a format is available. When this format is requested by some other app, it renders the content on-demand.

Done.

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