Why do the major browsers not support HTMLs ACCEPT attribute for input type="file"?

Question

Does anyone know how to use the accept attribute in input tags? I can see it documented, but w3schools indicates that it is not supported by any of the major browsers. Testing also confirms this.

I know that validation should be done server-side, and am doing that now. But it'd be nice to have it restrict the types of files in the file upload dialog for usability.

Edit: I am fully aware of the security implications of client-side only validation. I do not intend to remove server-side validation and am looking for a way to improve usability.

Answer 1

The reason why browsers don't actually implement the ACCEPT attribute is that MIME type validation is a science and not just as easy as reading a file extension. Even server-side MIME type verification can be difficult as noted by MediaWiki:

http://www.mediawiki.org/wiki/Manual:Mime_type_detection

Notice they attempt to verify the MIME type even server-side.

Answer 2

This attribute is supported by every major browser. Useful links are-- caniuse.com

w3 schools browser support for accept attriute

Thought it would be helpful for someone who wants to know about the browser support of HTML accept attribute.