https://w3c.github.io/svgwg/svg2-draft/single-page.html#struct-InterfaceSVGElementInstance

Is this implemented in browsers?
https://wpt.fyi/results/svg/idlharness.window.html

on WebKit
https://searchfox.org/wubkat/search?q=correspondingElement&path=&case=false&regexp=false

Or maybe there are missing tests in WPT to test them?