That doesn’t really work for a company like google with a largely blameless culture.
The only way of really judging is through repeat offences which is difficult in a case like this where the judgement was that Google didn’t do enough. That line of “enough” is going to be redefined a lot as the web develops (as it should be).
Set blend mode to multiply and it's fine (or invert it and use it as a layer mask). Although I'm not sure how useful it is for designers without the ability to tweak what you've drawn.