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Description
Currently, the type of Document.documentElement is HTMLElement:
But it is possible for a Document’s documentElement property to be of type SVGSVGElement which is not a subtype of HTMLElement:
Try to run the following code:
const d = (new DOMParser()).parseFromString('<svg xmlns="http://www.w3.org/2000/svg"></svg>', 'image/svg+xml');
const k = (d instanceof Document) && (d.documentElement instanceof SVGSVGElement);the value of k should be true.
Also, why isn’t there a SVGDocument in TypeScript?