By nod_ on
Change record status: 
Published (View all published change records)
Project: 
Drupal core
Introduced in branch: 
8.x
Issue links: 
https://www.drupal.org/node/297209
Description: 

When JavaScript is available the Attach button from the file input form element is hidden and upload will start as soon as the user selects a file to upload.

An example of the new behaviour can be found in this video http://www.youtube.com/watch?v=1-OZOODpzWw&feature=youtu.be&t=1m27s

Impacts: 
Site builders, administrators, editors