->LayoutRect/FloatRect::infiniteRect(). It is highly error prone (it covers only half of the min/max range) and does not work across types (intersect infinite LayoutRect with a point that's beyond LayoutUnit's max value).
https://searchfox.org/wubkat/source/Source/WebCore/platform/graphics/FloatRect.h#294 https://searchfox.org/wubkat/source/Source/WebCore/platform/graphics/LayoutRect.h#199 ^ Alan - is it still applicable?
sadly yes.