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render: real-world CSS rendering parity

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Colors: oklch()/oklab() and color-mix(); linear-gradient backgrounds.
Grid: named-line placement, repeat() expansion, drop whitespace-only
grid items; upgrade taffy 0.7 -> 0.12 so aspect-ratio images in
auto-height rows no longer collapse to slivers.
CSS: @layer, nesting, @property, :is()/:where(), clamp(), @media not all;
source/track/param/area and svg desc/metadata as display:none.
Images: webp + intrinsic sizing, srcset/picture, browser UA + Accept for
CDN fetches, grey placeholder on failure; width/height HTML attributes
rank below author CSS with aspect-ratio preserved for auto axes.
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SGavrl committed 2026-07-11 19:52:36 +00:00
1 parent 88313178b2
commit 2652ee64a4
17 files changed
+4482 -368
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crates/obscura-render/Cargo.toml
+8 -3
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@@ -8,16 +8,21 @@ description = "Optional scoped render layer for Obscura: layout (taffy) and, wit
[features]
default = []
# Rasterize the laid-out tree to a pixmap (tiny-skia) with text (ab_glyph) and images.
# Rasterize the laid-out tree to a pixmap (tiny-skia) with text (cosmic-text
# shaping + line breaking, ab_glyph fallback) and images.
# Off by default; the layout core (getBoundingClientRect etc.) works without it.
paint = ["dep:tiny-skia", "dep:ab_glyph", "dep:image", "dep:ureq", "dep:base64", "dep:resvg", "dep:usvg", "dep:url"]
paint = ["dep:tiny-skia", "dep:ab_glyph", "dep:cosmic-text", "dep:image", "dep:ureq", "dep:base64", "dep:resvg", "dep:usvg", "dep:url"]
[dependencies]
taffy = { workspace = true }
obscura-dom = { workspace = true }
tiny-skia = { workspace = true, optional = true }
ab_glyph = { workspace = true, optional = true }
image = { version = "0.24", default-features = false, features = ["jpeg", "png", "webp"], optional = true }
# Real inline text layout: HarfBuzz-class shaping (rustybuzz) + UAX#14 line
# breaking, the same algorithms browsers use. Built with only our embedded
# fonts (no system-font scan) so layout stays deterministic across hosts.
cosmic-text = { version = "=0.12.1", default-features = false, features = ["std", "swash"], optional = true }
image = { version = "0.25", default-features = false, features = ["jpeg", "png", "webp"], optional = true }
ureq = { version = "2.9", default-features = false, features = ["tls"], optional = true }
base64 = { workspace = true, optional = true }
# SVG rasterization for <img src="*.svg">, inline <svg>, and background-image