files/en-us/glossary/layout_mode/index.md
A layout mode, sometimes called layout, is a CSS algorithm that determines the position and size of element boxes based on the way they interact with their sibling and ancestor boxes.
There are several layout modes:
Float layout
[!NOTE] Not all CSS properties apply to all layout modes. Most of them apply to one or two of them and have no effect if they are set on an element participating in another layout mode.