@ yerzhan.tulepov: Please provide test URL with above mentioned tag along with device details on which this issue is seen. This would help in further triaging of the issue.

Thanks!

@ chelamcherla: Production url is https://azan.ru

Thank you for providing more feedback. Adding the requester to the cc list.

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

The issue is seen on Xiaomi Redmi Note 5.

And as far as I know it exists on Samsung (of my manager) as well. I don't know the exact model.

Tested the issue in Android and able to reproduce the issue. 

Steps Followed:
1. Navigated to https://azan.ru
2. Theme color is bot applied to toolbar

Chrome versions tested:
71.0.3578.99 , 73.0.3649.0

OS:
Android 9.0.0

Android Devices:
Pixel XL

Issue is seen from older M-60 builds, hence considering this as Non-Regression and marking as Untriaged.

Thanks!

Hi @chelamcherla,

Thanks for confirmation of the bug. On azan.ru the theme-color is dynamic, i.e. it changes 6 times a day. If you've confirmed the issue may I revert that (dynamic changing of toolbar's color) behaviour?

Regard,
Y.

Hello Yerzhan,

Yes, you can resume changing the theme colour.

Chrome will only use theme colours if they are dark enough to ensure there's enough contrast on the UI. Basically, it performs this calculation:

largest = max(color.red, color.green, color.blue);
smallest = min(color.red, color.green, color.blue);
average = (largest + smallest) / 2;
luminance = average / 255

And it will use the theme colour if luminance is <= 0.94.

If you're interested you can see the code used to check this in 'isValidThemeColor' and 'getLightnessForColor' in 'ColorUtils.java' at https://cs.chromium.org/chromium/src/chrome/android/java/src/org/chromium/chrome/browser/util/ColorUtils.java .

I'm going to close this bug since it's working as intended, but feel free respond if you have further questions.

Peter

Hello Peter!

Appreciate you for the valuable info.

Regards,
Y.