The referrerPolicy attribute for SVG specifies a referrer policy string.
"" | no-referrer | no-referrer-when-downgrade | origin | origin-when-cross-origin | same-origin | strict-origin | strict-origin-when-cross-origin | unsafe-url
strict-origin-when-cross-origin
download
href
hreflang
ping
rel
target
type
World Wide Web Consortium (W3C)