Closes#310.
A dark campaign rendered with beige cards inside it. markKeptSurfaces
marks any element whose declared background is below the luminance
threshold, with no area cap, so a 600px layout card is marked exactly
like a button. The CSS then exempted the marked element and its whole
subtree via [data-ihm-keep] *, so a light table nested in that card was
never touched. In the reported specimen 14 of 21 light panels survived.
The rule now is that being inside a painted surface is not inherited past
a sheet. The walk tracks that state and emits a second mark,
data-ihm-in-keep, for elements sitting on paint with no background of
their own; the CSS exempts those explicitly instead of exempting every
descendant. A nested light sheet ends the protection, and paint resumes
below it, so a button inside such a sheet is still kept whole.
The alternatives in the report were not taken. Dropping the descendant
half of the selector outright puts back what #294 fixed: a nested label
on a coloured cell loses its colour. An area threshold is a magic number
that misfires on both a legitimate hero banner and a small dark panel
with a light chip in it.
The tests assert against the neutraliser selector lifted out of
EMAIL_BASE_CSS rather than against the marks. The first draft of them
checked which attributes were set and passed against the unfixed code,
which proved nothing: the bug was in the rule that reads the marks, not
in the marking. All four fail without this change.
jcoffey-dev
6f3aba06a6