wlott

`content_size` for internal nodes incorrectly includes the node's left/top border.

21

It appears that for internal nodes the left/top border is included in the `content_size`, not just the padding. Leaf nodes, on the other hand, only include padding, not the border....

scrollable_overflow implementation

2

# Objective Replaces `content_size: Size` with `scrollable_overflow: Rect` and tries to match the definition of "scrollable overflow rectangle" in [CSS Overflow 3, 2.2. Scrollable Overflow](https://www.w3.org/TR/css-overflow-3/#scrollable). Fixes #871 - [ ]...