Bug 187606

Summary:	Multiple presses of spacebar on once checked and focused radio button does not fire subsequent events
Product:	WebKit	Reporter:	Jason Williams <jase.williams>
Component:	Forms	Assignee:	Nobody <webkit-unassigned>
Status:	NEW ---
Severity:	Normal	CC:	cdumez, wenson_hsieh
Priority:	P2
Version:	Safari 11
Hardware:	Mac
OS:	OS X 10.11
URL:	https://codepen.io/jasonwilliams1/pen/XBbZjL

Description Jason Williams 2018-07-12 10:10:09 PDT

Steps to reproduce the problem:
1. Navigate to https://codepen.io/jasonwilliams1/pen/XBbZjL
2. Focus on the textbox
3. Press shift-tab to move focus into the radio button group
4. Press spacebar to check the radio button
5. Press spacebar to redundantly check the radio button
6. observe no additional click event in the console

What is the expected behavior?
Right now its not clear, I don't see this mentioned in the specification either. 

What went wrong?
I should be expecting additional click events in the console, but only 1 fires

Firefox, Edge and Internet Explorer fire multiple events for each time i press spacebar

Chrome version: 67.0.3396.99  Channel: stable
OS Version: 10.0
Flash Version: 

Arises from: https://github.com/facebook/react/issues/4854#issuecomment-404543424

Comment 1 Jason Williams 2018-07-12 10:11:49 PDT

Affects Safari Version 11.1 (11605.1.33.1.3)

Comment 2 Jason Williams 2018-07-12 10:13:08 PDT

WHATWG issue raised: https://github.com/whatwg/html/issues/3817