Reflow
A layout that rearranges into one column when the window is narrow or the page is zoomed, with no sideways scrolling.
Reflow means that when a person zooms the page to 400% or uses a narrow screen, the content rearranges itself into a single column instead of forcing them to scroll sideways to read each line. WCAG’s Level AA reflow criterion sets the test at a width of 320 CSS pixels, which is what a 1,280-pixel-wide desktop window becomes at 400% zoom.
People with low vision depend on zoom, and sideways scrolling makes reading slow and tiring. A responsive design usually handles this, but fixed-width tables, wide images, and layouts that hide content below a certain width break it. Data tables are the common exception: they may scroll inside their own container as long as the rest of the page does not.
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