Icons were rendering as either overlapping solid squares or not at all,
text ran under the infobox instead of beside it, and general.css parsing
had two more silent-corruption bugs on top of the ones fixed earlier:
- A CSS declaration list was split on every literal semicolon, so any
value containing one inside a quoted string or url() (a data: URI
with a MIME parameter, e.g. url(data:image/svg+xml;utf8,<svg...>),
extremely common for small inline icon SVGs) got torn into two
malformed halves and silently dropped. This is why mask-image never
applied to the TOC toggle icons at all.
- data: URIs were only decoded as base64. Inline SVGs are just as
commonly written as data:image/svg+xml;utf8,<percent-escaped text>,
which needs percent-decoding instead; added that path.
- top/left/right/bottom/width/height only handled bare lengths and a
flat calc(a +/- b). Real values nest var(--x, fallback), calc(), and
min()/max() inside each other (Wikipedia's icon offset math is
literally calc(-1 * 22px / 2), and its icon sizing is
calc(max(calc(var(--font-size-medium,1rem) + 4px),10px))). Replaced
the flat evaluator with a small recursive resolver that handles all
three, nested arbitrarily. This is what was placing the TOC toggle
button's icon on top of the section text instead of in the left
margin where it belongs.
Added actual feature support once the parsing was correct:
- mask-image/-webkit-mask-image: the pattern behind most scalable
colored icons on the modern web (an SVG or image used purely as an
alpha stencil, tinted by background-color/color). Previously every
masked icon rendered as an unmasked solid-color square.
- float: left/right, approximated without a full per-line reflow
engine (which taffy's block/flex/grid modes don't provide): a
floated element is grouped into a row alongside the flow siblings
that follow it, up to whichever comes first of the next heading or
another float, then everything from there on reverts to normal
full-width flow. This isn't general CSS float, but it directly
targets the overwhelmingly common real shape (an infobox or image
floated near the top of an article, with the rest of the content
starting at the next section heading), and is what makes article
text actually wrap beside an infobox instead of running underneath
it.
Refactored paint.rs's image fetch/decode/cache logic into shared
helpers (fetch_bytes, raster_to_pixmap) reused by plain <img> painting,
background-image, and the new mask-image path.
SGavrl
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