Putting a hash in the hostname/domain would also be using same-origin policy. The issue you linked refers to using suborigins, which seems to still be a draft p

Putting a hash in the hostname/domain would also be using same-origin policy. The issue you linked refers to using suborigins, which seems to still be a draft proposal with no implementer buy-in outside of Chromium [1]. [1] https://bugzilla.mozilla.org/show_bug.cgi?id=1231225 https://bugzilla.mozilla.org/show_bug.cgi?id=1231225