The mark is fill="currentColor" inside an anchor, so an unstyled paint renders
it in the UA link blue. That is what the flash is: the document painted before
the stylesheet applies, not a theme switch.
Without a color-scheme declaration the browser treats the document as light, so
the canvas it paints between documents, and the scrollbar, are white. Gecko
paints a pending stylesheet's document far more readily than Blink does, which
is why it shows there and not in Chromium.
Dark on flux and bbs, which are dark only; all three branches on raayoni.
The other half of this is a Caddy change in bucur: every response currently
carries no Cache-Control, no ETag and no Last-Modified, so the stylesheet is
refetched on every navigation and the window keeps reopening.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
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