Apply WCAG reflow thinking to distinguish acceptable two-dimensional content from avoidable horizontal scrolling.
The move: contain the exception, do not let it become the page. WCAG reflow is a useful responsive QA lens. At narrow widths and high zoom, most content should read in one direction. Users should not have to move left and right line by line just to understand ordinary text or operate basic controls. Some content is different. Data tables, maps, code diffs, canvases, and rich editing surfaces can require two-dimensional layout. The mistake is allowing that requirement to pull unrelated content off-screen too. A wide table can scroll inside its own region while the surrounding title, filter, search, pagination,…
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