Chrome Version       : 53.0.2785.113
URLs see below
Other browsers tested:
     Safari: OK 9.1.1
     Firefox: OK 47.0.1

What steps will reproduce the problem?
(1) Open the page in Chrome for Mac
(2) Click a button

What is the expected result?

Some javascript runs and elements are added to the page.


What happens instead?

The tab freezes.



The website this happens on is private, but I can share access to it with someone privately if needed. the problem is 100% reproducable.

I have a button on a page; when I click that button, it triggers a bit of javascript that adds some elements to the page and fires off network requests. However, as of version 53 of Chrome, the tab freezes instead (if I downgrade to v52 for example, everything is ok).

This page is in an iframe; if I open the page in a separate tab, it works.

The devtools are still responsive but not actually working. I can't get a timeline to inspect memory usage or anything. The freeze is immediate, there's really nothing happening AFAIK.

i'm happy to do more digging but I don't know how to get anything interesting out of the crash report.