Gets or sets a comma-separated list of MIME encodings used to constrain the file types the user can select.
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Use this property to specify the file type that can be uploaded to the server. For example, to restrict the selection to images, set this property to "image/*".
Support for this property is browser-dependent. Check your browser to determine whether it supports this property. It is recommended that you use server-side code to ensure that the file is of the expected type.