What 400% Zoom Leaves Behind: An 82px Fixed Pixel Toll
A 320px reflow pass did not prevent severe vertical reading-space loss at short viewports. The loss was a fixed pixel cost, largely outside the application CSS.
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A 320px reflow test covers half of it: the 200px height at 400% zoom
WCAG 1.4.10 Reflow at three viewport heights: horizontal verdicts were identical. What 400% zoom changes is height. An 82px sticky header ate 41% of it.