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[Bug 22808] Throw if object is constructed without new

From: <bugzilla@jessica.w3.org>
Date: Mon, 16 Sep 2013 17:15:54 +0000
To: public-script-coord@w3.org
Message-ID: <bug-22808-3890-AKLROrCnod@http.www.w3.org/Bugs/Public/>
https://www.w3.org/Bugs/Public/show_bug.cgi?id=22808

--- Comment #7 from Travis Leithead [MSFT] <travil@microsoft.com> ---
I'm pretty hesitant to make this change without a web-compat analysis. I can
very easily imagine lots and lots of sites that just blindly do:

var x = XMLHttpRequest();
x....

In the past, IE has run a lot of custom code on the web intended just for it.
With IE11, we're starting to run much more of the Firefox/Chrome code, but in
this case, not throwing is more compatible. Switching to a throwing behavior
has generally made compat worse.

If you want to take on the burden of proof, that'd be great. I'm just saying
that I don't think I'd want to be the one to guinea-pig this change.

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