Reflow
Content rearranging into a single column at narrow widths or high zoom, without sideways scrolling.
Definition
WCAG 1.4.10 asks that content works at 320 CSS pixels wide (like 400% zoom) without scrolling in two directions.
In practice
At 400% zoom the article becomes one column, but the data table still forces sideways scrolling, which is acceptable only for content like tables.
Learn it in context
Lessons that use this term.