This should affect the following methods: SVGGraphicsElement::getBBox(): https://www.w3.org/TR/SVG2/types.html#InterfaceSVGGraphicsElement SVGSVGElement::createSVGRect(): https://www.w3.org/TR/SVG2/struct.html#InterfaceSVGSVGElement SVGTextContentElement::getExtentOfChar(): https://www.w3.org/TR/SVG2/text.html#InterfaceSVGTextContentElement
It will also affect the interface SVGAnimatedRect: https://www.w3.org/TR/SVG2/types.html#InterfaceSVGAnimatedRect
For all those interfaces, keep in mind that SVGRect, SVGMatrix and SVGPoint are aliases to DOMRect, DOMMatrix and DOMPoint now. So tests with the SVG* interfaces should still pass.
Related WPT tests: https://wpt.fyi/results/svg/types/scripted/SVGAnimatedRect.html?label=master&label=experimental
https://wpt.fyi/results/svg/types/scripted/SVGGraphicsElement.svg?label=master&label=experimental
@Said - isn't consensus now to keep them - https://github.com/w3c/svgwg/issues/706 and we can close this bug?