Flow relative values

In CSS, flow relative values are directional keyword values relative to an element’s block and inline axes. These values include block-start, block-end, inline-start, inline-end, start, and end.

In CSS, physical properties define positions based on physical directions and reference specific sides of an element.

CSS logical properties on the other hand define styles based on the document’s writing mode and direction rather than the physical dimensions of the viewport. Logical properties are relative to the content flow and use directional keywords relative to the block and inline axes.