Referring to CSS property values: While `margin` and `padding` appear to be constrained to 2^25px (33554428px), `border-width` appears to be "capped" at a considerably smaller value 2^16px (65536px). While the `border-width` can seemingly be set to larger values, doing so leads to some unexpected bugs, such as negative values for computed width. The expected behavior would be that `border-width` would have the same maximum value as `margin` and `padding`, and overflowing this value would not cause negative width values (as `width` cannot be negative).
It's difficult to confirm this bug without a test case. We don't believe there is an ongoing issue here. If you do feel there is a problem, please REOPEN this bug and include a test case illustrating the issue.