Thanks for the report & example.

CL:
https://chromium.googlesource.com/chromium/src/+log/efb0407ede1da3162449ba51c7743a5b5a477589..714109e6afe66297e7fe02cb8c499840856d1d5b

Unable to find the culprit, requesting Dev team to check the issue and assign to concerned owner.

Good Build: 52.0.2715.0
Bad Build: 52.0.2717.0

Able to reproduce the issue on Win7, Mac OS X 10.11.5, Ubuntu 14.04 using Chrome 52.0.2743.116, Beta 53.0.2785.70, Dev 54.0.2837.0 & Canary#54.0.2837.0

Hey, I checked the issue and came to the following conclusion:

The inner iFrame 'CustomTappIFrame' is resized via a message that is send to the top frame in an interval. The resize function is wrapped with window.requestAnimationFrame. The iFrames initial height is 500px, but because React didn't render anything in the first 200ms the new height of the inner iFrame is now 0. An element with the height 0 is not rendered and thus the resize function that is wrapped by the requestAnimationFrame gets not called again, even tho the interval is triggered every 200ms. After a resize the browser rerenders and fires the requestAnimationFrame callback. Thats why the iFrame is visible after resizing the window.

Did chromium change something in the way render cycles are handled/the requestAnimationFrame method worked? Is this intended behavior or a bug?

Here is part of the resize code for a better understanding:

    var resizeHandler = function resizeHandler() {
        window.requestAnimationFrame(() => {
            let height = document.body.offsetHeight;
            if (heightCache === height || height === 0) {
                return;
            }
            window.parent.postMessage('height: ' + height, '*')
            heightCache = height;
        });
    };
    setInterval(resizeHandler, 200);

Is that code running in a cross origin frame? Chrome recently stopped running requestAnimationFrame callbacks in invisible cross origin frames -- see https://www.chromestatus.com/feature/4514713492783104

I'm trying to reproduce at https://bamboo.tobit.software/Bestellen. What should
I be looking for? Could you please provide a screenshot or video of what is wrong?

Feedback needed for both Comment 5 and Comment 6.

In the regression range given in comment 2, this might be it:

Add FrameView::updateAllLifecyclePhasesExceptPaint and use it in a few cases.
https://chromium.googlesource.com/chromium/src/+/04e4faa37b382d13044fa6ceb41fc5308dbc8c2c

Mark it as WontFix since there are no feedback from user more than a month.Feel free to raise a new issue if sill facing.

Thank you!