See the spec change in https://github.com/whatwg/html/pull/7042 and the tests at - https://github.com/web-platform-tests/wpt/pull/30398 - https://github.com/web-platform-tests/wpt/pull/30418 For data: URLs, Safari seems to allow redirects in iframes, and hang the load forever in top-level windows. For about: URLs in iframes (didn't test top-level windows), Safari seems to allow redirects to about:blank and about:srcdoc, but give a network error page for about:nonstandard. In all cases the newly specced behavior is to display a network error page.
<rdar://problem/83244357>
Pull request: https://github.com/WebKit/WebKit/pull/4407
Committed 254619@main (cf4ebbe5d88a): <https://commits.webkit.org/254619@main> Reviewed commits have been landed. Closing PR #4407 and removing active labels.