UserAgent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/58.0.3029.81 Safari/537.36

Example URL:
http://jsbin.com/duveji/edit?html,output

Steps to reproduce the problem:
Test 1:
1. visit http://jsbin.com/duveji/edit?html,output
2. click the link that says "click here to play"
  >> an alert opens saying "Gonna play"
3. wait a few seconds to verify that the audio doesn't start playing
4. click on the "OK" button in the alert dialog

Test 2:
1. visit http://jsbin.com/duveji/edit?html,output
2. start playing the audio using its controls
3. click on the link that says "click here to pause"
3. wait a few seconds

What is the expected behavior?
In test 1, the audio should start playing when you dismiss the alert.

In test 2, the audio should not pause until you dismiss the alert.

What went wrong?
Test 1 works as expected

In test 2, after a couple of seconds of clicking, the audio pauses even if you don't dismiss the alert.

The behavior observed with test 1 is correct. The behavior observed with test 2 is incorrect. The fact that the behavior is not the same in both cases is especially nonsensical.

No matter how bad a practice it is to use alert(): while it exists it must behave properly and consistently.

Did this work before? N/A 

Is it a problem with Flash or HTML5? HTML5

Does this work in other browsers? N/A

Chrome version: 58.0.3029.81  Channel: stable
OS Version: 
Flash Version: Shockwave Flash 25.0 r0

Contents of chrome://gpu: