Spec: https://drafts.fxtf.org/geometry/#dom-dommatrixreadonly-dommatrixreadonly
The If init is a DOMString step 3 references Syntax of the SVG ‘transform’ attribute of css transform spec. That syntax is there, according to CSS transform spec:
To provide backwards compatibility, the syntax of the [SVG] transform presentation attribute differs from the syntax of the [CSS] transform style property as shown in the example above. [...] Authors are advised to follow the rules of CSS Values and Units Module.
It doesn't make much sense to target a new spec with a syntax that is there only for backwards compatibility. I propose we change this 3rd item to depend on the main CSS transform style syntax defined on CSS Values and Units.
Was there an underlying issue to reference DOMMatrix init with the backwards compatible SVG transform?