commit 805778c7b732c706fc0ad49b570c33464543ff00
Author: Federico Mena Quintero <federico gnome org>
Date: Tue Oct 12 21:16:17 2021 -0500
Start a list of supported SVG features
Part-of: <https://gitlab.gnome.org/GNOME/librsvg/-/merge_requests/605>
FEATURES.md | 420 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 420 insertions(+)
---
diff --git a/FEATURES.md b/FEATURES.md
new file mode 100644
index 00000000..a8460eaf
--- /dev/null
+++ b/FEATURES.md
@@ -0,0 +1,420 @@
+# SVG and CSS features that librsvg supports
+
+## Attributes supported by all elements
+
+| Attribute | Notes |
+| transform | The `transform` attribute has a different syntax than the CSS `transform` property. |
+| | |
+| xml:lang | |
+| | |
+| xml:space | |
+
+## Elements and their specific attributes
+
+FIXME: add global attributes parsed in element.rs, not by specific element implementations
+
+cond
+
+| Element | Attributes | Notes
|
+| a | |
|
+| | xlink:href | Needs xlink namespace
|
+| | href | SVG2
|
+| | |
|
+| circle | |
|
+| | cx |
|
+| | cy |
|
+| | r |
|
+| | |
|
+| clipPath | |
|
+| | clipPathUnits |
|
+| | |
|
+| defs | |
|
+| | |
|
+| ellipse | |
|
+| | cx |
|
+| | cy |
|
+| | rx |
|
+| | ry |
|
+| | |
|
+| feBlend | | See "Filter effects"
|
+| | in |
|
+| | in2 |
|
+| | mode |
|
+| | |
|
+| feColorMatrix | | See "Filter effects"
|
+| | in |
|
+| | type |
|
+| | values |
|
+| | |
|
+| feComponentTransfer | | See "Filter effects"
|
+| | in |
|
+| | |
|
+| feComposite | | See "Filter effects"
|
+| | in |
|
+| | in2 |
|
+| | operator |
|
+| | k1 |
|
+| | k2 |
|
+| | k3 |
|
+| | k4 |
|
+| | |
|
+| feConvolveMatrix | | See "Filter effects"
|
+| | in |
|
+| | order |
|
+| | divisor |
|
+| | bias |
|
+| | targetX |
|
+| | targetY |
|
+| | edgeMode |
|
+| | kernelMatrix |
|
+| | kernelUnitLength |
|
+| | preserveAlpha |
|
+| | |
|
+| feDiffuseLighting | | See "Filter effects"
|
+| | in |
|
+| | surfaceScale |
|
+| | kernelUnitLength |
|
+| | diffuseConstant |
|
+| | |
|
+| feDisplacementMap | | See "Filter effects"
|
+| | in |
|
+| | in2 |
|
+| | scale |
|
+| | xChannelSelector |
|
+| | yChannelSelector |
|
+| | |
|
+| feDistantLight | |
|
+| | azimuth |
|
+| | elevation |
|
+| | |
|
+| feFuncA | | See "Filter effect feComponentTransfer"
|
+| | |
|
+| feFuncB | | See "Filter effect feComponentTransfer"
|
+| | |
|
+| feFuncG | | See "Filter effect feComponentTransfer"
|
+| | |
|
+| feFuncR | | See "Filter effect feComponentTransfer"
|
+| | |
|
+| feFlood | | See "Filter effects"
|
+| | | Parameters come from the flood-color and flood-opacity
properties. |
+| | |
|
+| feGaussianBlur | | See "Filter effects"
|
+| | in |
|
+| | stdDeviation |
|
+| | |
|
+| feImage | | See "Filter effects"
|
+| | xlink:href | Needs xlink namespace
|
+| | href | SVG2
|
+| | path | Non-standard; used by old Adobe Illustrator versions.
|
+| | preserveAspectRatio |
|
+| | |
|
+| feMerge | | See "Filter effects"
|
+| | |
|
+| feMergeNode | |
|
+| | in |
|
+| | |
|
+| feMorphology | | See "Filter effects"
|
+| | in |
|
+| | operator |
|
+| | radius |
|
+| | |
|
+| feOffset | | See "Filter effects"
|
+| | in |
|
+| | dx |
|
+| | dy |
|
+| | |
|
+| fePointLight | |
|
+| | x |
|
+| | y |
|
+| | z |
|
+| | |
|
+| feSpecularLighting | | See "Filter effects"
|
+| | in |
|
+| | surfaceScale |
|
+| | kernelUnitLength |
|
+| | specularConstant |
|
+| | specularExponent |
|
+| | |
|
+| feSpotLight | |
|
+| | x |
|
+| | y |
|
+| | z |
|
+| | pointsAtX |
|
+| | pointsAtY |
|
+| | pointsAtZ |
|
+| | specularExponent |
|
+| | limitingConeAngle |
|
+| | |
|
+| feTile | | See "Filter effects"
|
+| | in |
|
+| | |
|
+| feTurbulence | | See "Filter effects"
|
+| | baseFrequency |
|
+| | numOctaves |
|
+| | seed |
|
+| | stitchTiles |
|
+| | type |
|
+| | |
|
+| filter | |
|
+| | filterUnits |
|
+| | primitiveUnits |
|
+| | x |
|
+| | y |
|
+| | width |
|
+| | height |
|
+| | |
|
+| g | |
|
+| | |
|
+| image | |
|
+| | xlink:href | Needs xlink namespace
|
+| | href | SVG2
|
+| | path | Non-standard; used by old Adobe Illustrator versions.
|
+| | x |
|
+| | y |
|
+| | width |
|
+| | height |
|
+| | preserveAspectRatio |
|
+| | |
|
+| | |
|
+| line | |
|
+| | x1 |
|
+| | y1 |
|
+| | x2 |
|
+| | y2 |
|
+| | |
|
+| linearGradient | |
|
+| | gradientUnits |
|
+| | gradientTransform |
|
+| | spreadMethod |
|
+| | x1 |
|
+| | y1 |
|
+| | x2 |
|
+| | y2 |
|
+| | |
|
+| marker | |
|
+| | markerUnits |
|
+| | refX |
|
+| | refY |
|
+| | markerWidth |
|
+| | markerHeight |
|
+| | orient |
|
+| | preserveAspectRatio |
|
+| | viewBox |
|
+| | |
|
+| mask | |
|
+| | x |
|
+| | y |
|
+| | width |
|
+| | height |
|
+| | maskUnits |
|
+| | maskContentUnits |
|
+| | |
|
+| path | |
|
+| | d |
|
+| | |
|
+| pattern | |
|
+| | xlink:href | Needs xlink namespace
|
+| | href | SVG2
|
+| | patternUnits |
|
+| | patternContentUnits |
|
+| | patternTransform |
|
+| | preserveAspectRatio |
|
+| | viewBox |
|
+| | x |
|
+| | y |
|
+| | width |
|
+| | height |
|
+| | |
|
+| polygon | |
|
+| | points |
|
+| | |
|
+| polyline | |
|
+| | points |
|
+| | |
|
+| radialGradient | |
|
+| | gradientUnits |
|
+| | gradientTransform |
|
+| | spreadMethod |
|
+| | cx |
|
+| | cy |
|
+| | r |
|
+| | fx |
|
+| | fx |
|
+| | fr |
|
+| | |
|
+| rect | |
|
+| | x |
|
+| | y |
|
+| | width |
|
+| | height |
|
+| | rx |
|
+| | ry |
|
+| | |
|
+| stop | |
|
+| | offset |
|
+| | |
|
+| style | |
|
+| | type |
|
+| | |
|
+| svg | |
|
+| | x |
|
+| | y |
|
+| | width |
|
+| | height |
|
+| | viewBox |
|
+| | preserveAspectRatio |
|
+| | |
|
+| switch | |
|
+| | |
|
+| symbol | |
|
+| | preserveAspectRatio |
|
+| | viewBox |
|
+| | |
|
+| text | |
|
+| | x |
|
+| | y |
|
+| | dx |
|
+| | dy |
|
+| | |
|
+| tref | |
|
+| | xlink:href | Needs xlink namespace
|
+| | |
|
+| tspan | |
|
+| | x |
|
+| | y |
|
+| | dx |
|
+| | dy |
|
+| | |
|
+| use | |
|
+| | xlink:href | Needs xlink namespace
|
+| | href | SVG2
|
+| | x |
|
+| | y |
|
+| | width |
|
+| | height |
|
+
+## CSS properties
+
+Shorthands:
+
+| Property | Notes |
+| font | |
+| marker | |
+
+Longhands:
+
+| Property | Notes |
+| baseline-shift | |
+| clip-path | |
+| clip-rule | |
+| color | |
+| color-interpolation-filters | |
+| direction | |
+| display | |
+| enable-background | |
+| fill | |
+| fill-opacity | |
+| fill-rule | |
+| filter | |
+| flood-color | |
+| flood-opacity | |
+| font-family | |
+| font-size | |
+| font-stretch | |
+| font-style | |
+| font-variant | |
+| font-weight | |
+| letter-spacing | |
+| lighting-color | |
+| line-height | Not available as a presentation attribute. |
+| marker-end | |
+| marker-mid | |
+| marker-start | |
+| mask | |
+| mix-blend-mode | Not available as a presentation attribute. |
+| opacity | |
+| overflow | |
+| paint-order | |
+| shape-rendering | |
+| stop-color | |
+| stop-opacity | |
+| stroke | |
+| stroke-dasharray | |
+| stroke-dashoffset | |
+| stroke-linecap | |
+| stroke-linejoin | |
+| stroke-miterlimit | |
+| stroke-opacity | |
+| stroke-width | |
+| text-anchor | |
+| text-decoration | |
+| text-rendering | |
+| transform | SVG2; different syntax from the `transform` attribute. |
+| unicode-bidi | |
+| visibility | |
+| writing-mode | |
+
+### Filter effects
+
+The following elements are filter effects:
+
+* feBlend
+* feColorMatrix
+* feComponentTransfer
+* feComposite
+* feConvolveMatrix
+* feDiffuseLighting
+* feDisplacementMap
+* feFlood
+* feGaussianBlur
+* feImage
+* feMerge
+* feMorphology
+* feOffset
+* feSpecularLighting
+* feTile
+* feTurbulence
+
+All of them support these attributes:
+
+| Attribute | Notes |
+| x | |
+| y | |
+| width | |
+| height | |
+| result | |
+
+Some filter effect elements take one input in the `in` attribute, and
+some others take two inputs in the `in`, `in2` attributes. See the
+table of elements above for details.
+
+### Filter effect feComponentTransfer
+
+The `feComponentTransfer` element can contain children `feFuncA`,
+`feFuncR`, `feFuncG`, `feFuncB`, and those all support these
+attributes:
+
+| Attribute | Notes |
+| type | |
+| tableValues | |
+| slope | |
+| intercept | |
+| amplitude | |
+| exponent | |
+| offset | |
+
+# XML features
+
+FIXME: `<xi:include href= parse= encoding=>`
+
+FIXME: `<xi:fallback>`
+
+FIXME: `xml:lang` attribute
+
+FIXME: `xml:space` attribute
+
+# Explicitly Unsupported features
+
+* `flowRoot` element and its children - Inkscape, SVG 1.2 only., #13
+
+* `glyph-orientation-horizontal` property - SVG1.1 only, removed in SVG2