I’m noticing a really weird issue, however, I’m not sure if I’m outside of spec or not.

I wrote an app a long time ago that uses Red images and allows you to use multiple filters like hueRotate, brightness and saturation to make those images be nearly any color.

I’m noticing, recently (haven’t noticed it before in the past 4-5 years), that on Safari, and Chrome Mobile (android and Apple), if the brightness value gets too high (something around 2000%), the browser refuses to apply the brightness filter unless I set the saturation to 0. The users are trying to make the red images appear white. I’d like to know if there is a rule regarding the range of brightness percentages, or perhaps a vendor-prefixed rule I should be using instead.