window.open is specced to throw if a popup blocker blocks the open() call, which matches precisely 0 browsers

[bzbarsky]

https://html.spec.whatwg.org/multipage/browsers.html#dom-open step 4 says:

If this results in there not being a chosen browsing context, then throw an "InvalidAccessError" DOMException

Simple testcase:

<script>
try { 
 window.open("http://example.com");
 alert("no exception");
} catch (e) {
 alert("exception: " + e)
}
</script>

This alerts "no exception" in today's Firefox, Chrome, Safari, Edge.