Chrome Version       : 51.0.2693.2 (Official Build) canary (64-bit) (MacOS)
URLs (if applicable) : https://jsfiddle.net/516amfmL/2/
Other browsers tested: 49.0.2623.110 (Official Build) (64-bit) (MacOS & Windows)
  Add OK or FAIL, along with the version, after other browsers where you
have tested this issue:
     Safari: OK (v 9.1)
    Firefox: FAIL (v 39.0)
         IE: OK (MS Edge on Windows)

What steps will reproduce the problem?
  (1) Visit https://jsfiddle.net/516amfmL/2/
  (2) Click into INPUT box.
  (3) Press ENTER
  (4) Not displayed <button> gets triggered, rather than the displayed button.

What is the expected result?

  One of two choices would be acceptable:
    (1) Simply submit the form and don't "click" any button.
    (2) "Click" the first displayed button, ignoring any action on hidden buttons.

What happens instead?

  The button that isn't visible, not even displayed, is triggered.

Please provide any additional information below. Attach a screenshot if
possible.

  I do wonder if this is a known Quirk and that this is a purposely non-fixed bug.
  I'm surprised that it works in Safari & MS Edge, but fails in Chrome & Firefox.

 

Deleted: Screen Shot 2016-03-29 at 10.44.48 PM.png 200 KB

	Screen Shot 2016-03-29 at 10.44.48 PM.png 200 KB View Download