Turn the lamp down on a figure, rather than take its paper away

[sotashimozono]

A figure carries its own white inside the SVG, where no stylesheet reaches it. On a dark page that is a lit rectangle — the one thing left bright after everything else followed the reader's choice.

Taking the white away is not the fix it looks like: the axes, ticks and labels are dark ink, and without the paper behind them they would be dark on dark. That is exactly why DRAWN_ON_WHITE exists here. So the page dims it instead.

Why 0.85

Chosen by looking at 1.00 / 0.92 / 0.85 / 0.78 side by side on a real figure from the demo registry — 0.92 barely helps, 0.78 muddies the data — and then checked:

at brightness(.85)
paper	#ffffff → #d9d9d9
ink / paper	14.9
axis / paper	7.2
a plotted line / paper	4.4 (a graphical object wants 3)
paper / the card it sits on	12.3

Where the rule lives

In the derived dark sheet, not the injected <style>: that file is already gated by the media attribute the control rewrites, so it applies exactly when dark does and needs no guard of its own.

Pinax says the same thing in its own stylesheet for reports rendered from here on (QAtlasHub/Pinax.jl#155). This is for every report frozen before that — which is all of them.

A mitigation, not a fix. The fix is figures that are not drawn on white, and that belongs to whoever writes the report.

Version 0.8.6 → 0.8.7.

🤖 Generated with Claude Code

[codecov]

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