Soon browsers will treat `target="_blank"` as having `rel="noopener"` by default

[Malvoz]

FYI @danielstjules

In a recent WHATWG spec change, all target="_blank" links should now imply rel="noopener". And the opener link relation was added.

Additionally, the rel attribute is now supported on <form> elements as well.

https://bugs.chromium.org/p/chromium/issues/detail?id=898942
https://bugzilla.mozilla.org/show_bug.cgi?id=1503681
https://bugs.webkit.org/show_bug.cgi?id=190481

[kestutisv]

Here https://mathiasbynens.github.io/rel-noopener/ on Firefox 67.0.4 still clicked on "Click me!!1 (same-origin)" OR cross-origin is not having rel="noopener" by default.
Same with Google Chrome 75.0.3770.90.

So, Firefox and Google Chrome still do not support WHATWG spec change.