It’s just a white screen now, with this in the console:
Unfortunately ie11 is now an old browser and I understand that Discourse does not want to support it anymore
Ok, so it’s something that happened on Discourse’s side?
And just like the playground, it’s a shame support just gets dropped like that overnight, while BJS itself is all about backward-compatibility, its first golden rule 
Yep it is on Discourse side:( and maybe it is a bug
For Babylon.js, it still work on ie11 of course:)
For the pg, because of monaco(code editor) we decided to drop or support (and I’m sad about that)
I see:
And their demo forum has the same bug.
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So the cofounder of Stack Overflow also founded Discourse. Impressive.
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Ohh dear - as I type on a Windows XP PC using Firefox that they stopped producing 2 years ago (?) 
cheers, gryff 
Bjs still supports IE of course 
Just noticed today that it works again 
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