The provided documents describe how the Chromium layout engine, specifically the Blink renderer, prevents content from overlapping CSS floats using the LayoutNG framework. This process relies on an ExclusionSpace, a model that tracks placed floats as unavailable areas to determine valid layout opportunities for subsequent lines and blocks. When a float is positioned, it is recorded as an exclusion rectangle, forcing the engine to reduce the available inline width for surrounding text and elements. The system also supports complex scenarios like shape-outside, where content flows around non-rectangular boundaries, and manages clearance to ensure elements move below relevant floats. Overall, the engine ensures non-overlap guarantees by querying this geometric space before placing any fragments within a block formatting context.