"Unable to reproduce the issue on the reported chrome version 58.0.3029.110 and on the latest canary 65.0.3285.0 using windows 10 with the below mentioned steps.
1.Started Windows Narrator
2. Opened Chrome
3. Navigated to http://www.oaa-accessibility.org/example/8/
4. Clicked on a checkbox 
5. Toggled using space bar
We observed windows narrator reading every event while toggling the check box. Attaching the screen cast with audio.

@Reporter: Could you please check the screen cast and let us know if we have missed any steps in reproducing the issue. Could you please check the same by creating a new profile with no extensions, apps, and let us know if the issue still persists. We request you to upgrade the chrome to the latest stable #63.0.3239.84 and check the same, Please find the link below.
https://www.chromium.org/getting-involved/dev-channel

Thanks! "

Deleted: 793088.mp4 7.8 MB

	793088.mp4 7.8 MB View Download

I can confirm that this issue exists on the latest stable version of chrome.

1. Navigate to http://www.oaa-accessibility.org/example/8/
2. turn on narrator.
3. tab until you get to the check boxes, note that their state is read correctly.
4. Press space on one of the check boxes.  Its state changes, but the changed state is not announced.

What should happen:
When pressing space on a checked check box, Narrator should say "unchecked" to indicate the new state.  If space is pressed on an unchecked check box, Chrome should say "checked" to indicate the new state.  

What actually happens:
Pressing space to toggle a check box state results in no announcement by Narrator.  

Work-around:
If I shift+tab away from the check box and tab back to it again, I can hear the updated state.  Put another way, resetting focus causes the correct state to be read.  

Additional notes:
I should note that this seems to be specific to Narrator, this behavior does not seem to occur in NVDA and ChromeVox.

Confirmed with Narrator and Chrome 65.0.3309.0

Also, NVDA 2017.4 has trouble focusing the example and exiting the example once focused. Indicating there may be more going on with this particular page.

This issue has been Available for over a year. If it's no longer important or seems unlikely to be fixed, please consider closing it out. If it is important, please re-triage the issue.

Sorry for the inconvenience if the bug really should have been left as Available.

For more details visit https://www.chromium.org/issue-tracking/autotriage - Your friendly Sheriffbot