third_party/blink/renderer/core/html/parser/mathml_attribute_names.json5

{
  metadata: {
    namespace: "MathML",
    namespaceURI: "http://www.w3.org/1998/Math/MathML",
    attrsNullNamespace: true,
  },

  data: [
    "definitionURL",
    "encoding",
  ],
}