UserAgent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/57.0.2987.110 Safari/537.36

Steps to reproduce the problem:
1. open options.html in Chrome
2. press Enter or click OK
3. popup with message "Please fill out this field" will be shown
4. install extension
5. go to its Options
6. press Enter or click OK
7. no popup will be shown

What is the expected behavior?
popup with message "Please fill out this field" should be shown

What went wrong?
popup is not shown

Did this work before? No 

Does this work in other browsers? N/A

Chrome version: 57.0.2987.110  Channel: stable
OS Version: 10.0
Flash Version: Shockwave Flash 25.0 r0

Popup is shown if we add
"options_ui": {
  "open_in_tab": true
}
in manifest, or if we use old way to declare options:
"options_page": "options.html"

If nothing is entered in input, :invalid CSS selector is applied(background color is changed) and onsubmit event is not fired when OK is clicked or Enter is pressed. So Chrome takes notice of 'required' attribute, but doesn't show warning popup, when options dialog is displayed using new way.

Bug is not fixed for more then a year:
https://bugs.chromium.org/p/chromium/issues/detail?id=598204
 

Deleted: required attr test.zip 889 bytes

required attr test.zip 889 bytes Download