TIL: noreferrer and noopener 'rel' links. Super important if you link to external content!https://twitter.com/mathias/status/709670807304347648 …
@oncletom @jwajsberg `window.opener` itself should work, as well as `opener.location`. Things like `opener.document` are subject to CORS.
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@jwajsberg@oncletom I’ve added a cross-origin link to the demo - 1 more reply
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