Ray Slakinski aa91b457bb The zoomed page fills the window again (width was divided twice) ...

Zooming left the page filling four fifths of the window, and less as the
zoom went up: at 1.6 it sat in the left three fifths with the rest of the
window empty.

body carried width:calc(100%/zoom). Under CSS zoom a percentage already
resolves against the containing block in the zoomed element's own units,
so 100% is the full width and dividing it again shrank the page by the zoom
a second time. A block fills its container without being told to, so the
declaration is gone. Viewport units are the exception -- dvh does not know
about zoom -- which is why the height still has to be divided back out.

Measured at 1.25, 1.6 and 2: body is exactly the window's 2275 by 1427 in
each, and the document overflows by nothing in either direction. The first
time round only the overflow was checked, which a page that under-fills
passes just as happily as one that fits.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

2026-09-19 19:49:44 -04:00

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