Re: [w3c/clipboard-apis] `ClipboardItem`: clarify mime parsing (Issue #242)

EdgarChen left a comment (w3c/clipboard-apis#242)

No browser throws an exception on `ClipboardItem` constructor for invalid MIME type. Chrome and Firefox reject the `write()` if `ClipboardItem` contains any invalid MIME types. Safari ignores the invalid MIME types and still write the data for valid MIME types in `write()`, e.g. https://codepen.io/edgarchen/pen/ZYOBYRN.

And all browsers treat MIME types with parameters as invalid, for example `ClipboardItem.supports("text/plain;charset=utf-8")` returns `false`. Chrome and Firefox reject the `write()` if the MIME type has parameter. Safari also ignore it in write(), e.g. https://codepen.io/edgarchen/pen/NPrbPoO.

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