“ResizeObserver - loop limit exceeded” | API is never used

Question

I am running a hybrid PhoneGap app (for a several years, running Cordova Android 6.1.2, more recently 9.0); for years, our #1 javascript error by a significant margin has been

ResizeObserver loop limit exceeded

However , the key distinction for my issue compared to the many other reports found on Google of this error is is that there are 0 instances of ResizeObserver being used anywhere in my code. Searching my entire computer, the only instance of ResizeObserver showing up anywhere is a random Steam file. Looking at my app while it's running, setting window.ResizeObserver = undefined doesn't break/do anything and document.resizeObservers (per the W3C documentation) returns nothing.

I have seen this post, which seems to be the canonical one for this error: ResizeObserver - loop limit exceeded . The answer of "This error means that ResizeObserver was not able to deliver all observations within a single animation frame. It is benign (your site will not break)." would be sufficient for me if I was actually using ResizeObserver. Since I am not using it, I am concerned that this error showing up is indicative of something larger going wrong.

There is no discernible pattern from our users' Chrome version/locale/time zone/Android version/etc/etc, unfortunately.

I've researched this API extensively and have found nothing that would indicate to my issue; either why there would be some sort of phantom ResizeObserver running and/or why that error would show up in an app that doesn't use that API.

Any help here (even just a vague direction to look at) would be very much appreciated. Thanks so much!

Answer 1

https://bugs.chromium.org/p/chromium/issues/detail?id=809574

Even the browser's Shadow DOM may be using this API, and cause this error to fire.
You can still safely ignore it.