innerHeight is in page CSS pixels and shrinks under browser zoom;
outerHeight does not. At 150-200% zoom a normal window therefore shows an
absolute outer/inner gap of 400-500px, past every threshold, so an
accessibility zoom read as a docked DevTools panel and - at protectionLevel
"maximum" - redirected the guest off the gallery on load. Pre-existing
(the previous threshold was 100px), but the rewrite kept the shape.
The gap is now measured relative to a baseline taken at mount, and the
baseline is re-taken whenever devicePixelRatio changes, which a zoom step
does and a docked panel does not. Only a gap that grows past the threshold
at a constant ratio counts. The mount-time check is dropped: a panel that
is already open at load is indistinguishable from a zoomed window.
Paul Nothaft
72894e22c2