Source: CSS exclusions with Queen Bey - Chen Huijing Let’s introduce: Exclusions. This is a new feature coming up to the CSS of the future. And I say that because currently this feature is only supported in two browsers: IE and Edge 😮 and there is a working draft spec.
Now, what does this new feature do? Well, do you remember floats? Perfect, because exclusions are somewhat floats but behave differently.