From https://github.com/microsoft/vscode/issues/139698 `animateTransform` is a valid SVG element: https://developer.mozilla.org/en-US/docs/Web/SVG/Element/animateTransform but it is not supported in syntax highlighting: 
From microsoft/vscode#139698
animateTransformis a valid SVG element: https://developer.mozilla.org/en-US/docs/Web/SVG/Element/animateTransform but it is not supported in syntax highlighting: