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

@dway123 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. Using this the native app can then request for the web custom format corresponding to a particular MIME type of interest. This also helps in [Delay 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 and when it is requested by some other app, it renders the content on-demand.
+
+The web custom format map will have the below naming convention per platform:
+
+On Windows it will be inserted as `Web Custom Format Map`, on MacOS `com.web.custom.format.map` & On Linux/Android/CrOS etc `application/web;type="web/customformatmap"`.
+The payload in this format map will be of type JSON with the key representing the MIME type and the web custom format as the value.
+e.g. On Windows the web custom format map will have the below payload:

Is this just on Windows? Or will the payload be the same on all platforms?

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