Navigator 3.0
mimetype.type
The type property of a MimeType object is a read-only string that specifies the name of the MIME type. This is a unique string such as "text/html" or "image/jpeg" that distinguishes this MIME type from all others. It describes the general type of data and the data format used.
The value of the type property can also be used as an index to access the elements of the navigator.mimeTypes[] array.