UnreviewedUnreviewedwidthBorder-box width and height in CSS pixels.
UnreviewedrectsMatches for includeRectsFor, in document order. Empty when omitted.
UnreviewedclientPadding-box dimensions, matching the browser's clientWidth / clientHeight.
UnreviewedscrollFull scrollable-content dimensions, matching scrollWidth / scrollHeight.
UnreviewedoverflowContent exceeds the padding box on this axis, regardless of CSS overflow.
UnreviewedclippedThe exceeded content is visually clipped on this axis.
UnreviewedscrollableThe exceeded content can be scrolled by the reader on this axis.
UnreviewedscrollCurrent scroll offset, matching scrollLeft / scrollTop.
UnreviewedhiddenClipped content sits past this specific edge, in logical writing-mode
terms. A clipped box that has not been scrolled hides content past its end
edge only; scroll it to the end and the hidden content moves to the start.
These drive the fade mask.
Current box dimensions, matching descendant rects, and content-overflow state.