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

@dway123 commented on this pull request.



> +
+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:
+```
+{
+
+  "text/html" : "Web Custom Format0",
+  "text/plain" : "Web Custom Format1",
+  "text/csv" : "Web Custom Format2"
+}
+```
+
+The web custom format in the value contains the actual payload of the custom MIME type. It will be serialized in terms of raw bytes and will have the below formating naming convention:
+
+On MacOS (and iOS), clipboard formats are named using the UTI reverse-DNS naming convention. Therefore, a MIME type `"custom/format"` will be transformed to `"com.web.custom.format(0-99)"`. Note that the pickling prefix `"com.web"` precedes the transformed format name `"custom.format"`, and the slash is converted to a period.

Where is "custom/format" coming from? I thought this will be provided by the browser, so sites and native apps both don't need to supply this

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