target="_blank" rel="noreferrer" implies noopener

[simonhaenisch]

<a href="#" target="_blank" rel="noreferrer"></a>

[tslint] Anchor tags with target="_blank" should also include rel="noopener noreferrer"

But, as pointed out here: https://twitter.com/_developit/status/1054422343609655296

<a rel="noreferrer"> implies noopener. Specifying both is redundant.

jsx-eslint/eslint-plugin-react#2022

[JoshuaKGoldberg]

Thanks for pointing this out @simonhaenisch!

As ljharb mentioned in the eslint-plugin-react reference, it's unclear which browsers support that behavior. It wouldn't be surprising if IE behaved wrongly here. We could add an option for this rule to allow not enforcing noopener if noreferrer is there.