Input - accept : file_extension | audio/* | video/* | image/* | media_type

accept = " file_extension | audio/* | video/* | image/* | media_type "

Parameters :

file_extension - Specify the file extension(s) (e.g: .gif, .jpg, .png, .doc) the user can pick from
audio/* - The user can pick all sound files
video/* - The user can pick all video files
image/* - The user can pick all image files
media_type - A valid media type, with no parameters. Look at IANA Media Types for a complete list of standard media types

Example :

<input type="file" id="img" name="img" accept="image/*">

The accept attribute specifies a filter for what file types the user can pick from the file input dialog box.

Note: The accept attribute can only be used with <input type="file">.

Tip: Do not use this attribute as a validation tool. File uploads should be validated on the server.