In #7058 the properties object-overflow and object-view-box were introduced, which define whether and how content of replaced elements overflows its content box.

On the other hand we have overflow, overflow-x, overflow-y and overflow-clip-margin, which apply to all elements (including replaced elements) and define how overflow on them is handled and whether they can paint outside their bounds.

As I understand it, object-view-box only defines the size of the canvas an image or object is painted in but doesn't have any effect on painting outside its content box.

Though object-overflow's effect seems to overlap with the effects of overflow: clip/overflow: visible and overflow-clip-margin.

So I am wondering how those properties actually play together and if the functionality of the new object-* properties might not be covered by the overflow-* properties.

Sebastian