Bug 253937 – Container query units should work inside SVG attributes

• Status: NEW
• Component: CSS

[Tim Nguyen (:ntim)]

https://wpt.fyi/results/css/css-contain/container-queries/container-units-svglength.html?label=master&label=experimental&product=chrome&product=firefox&product=safari&aligned&view=interop&q=label%3Ainterop-2023-container

[Radar WebKit Bug Importer]

<rdar://problem/106739462>

[Antti Koivisto]

Currently our SVGLength code only supports unit types defined in SVGLengthType enum:

enum class SVGLengthType : uint8_t {
    Unknown = 0,
    Number,
    Percentage,
    Ems,
    Exs,
    Pixels,
    Centimeters,
    Millimeters,
    Inches,
    Points,
    Picas
};

Per spec (https://svgwg.org/svg2-draft/types.html#InterfaceSVGLength) other types can be supported too. This is not a container unit specific issue but a general SVG issue.