<p></p>
<p dir="auto">Browsers can treat <a href="https://www.w3.org/TR/secure-contexts/#localhost" rel="nofollow">localhost as secure</a> only if they <a href="https://datatracker.ietf.org/doc/html/draft-west-let-localhost-be-localhost" rel="nofollow">force localhost to resolve to a loopback address</a>.</p>
<p dir="auto">So there's no guarantee it will be secure, although in practice I believe it is for all currently used browsers.</p>

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