See https://github.com/web-platform-tests/wpt/pull/28129.
It seems that this is enforced in `fetch()`, but a "SyntaxError" DOMException is thrown rather than a SyntaxError?
<rdar://problem/75833137>
We, Chromium, are going to follow Firefox. https://groups.google.com/a/chromium.org/g/blink-dev/c/FmY3E3-KaYI/m/QPJFiZAkAAAJ
We are still failing WPT test in Safari Technical Preview 150: https://wpt.fyi/results/xhr/json.any.html?label=experimental&label=master&aligned but this got fixed recently: https://github.com/WebKit/WebKit/commit/c74e2dd4d5886b9a328977a6b46b98a7830b7128 I am going to mark this as duplicate of 243109. *** This bug has been marked as a duplicate of bug 243109 ***