Does this mode exist in IE10 as well?

ax · on Feb 26, 2013

Yes, IE 10 has IE 6 (Quirks), 7, 8, and 9 mode.

astrodust · on Feb 26, 2013

There's a sad story waiting to be written about the developers that have had to spend so much time deliberately introducing bugs into IE10 to make this feature work.

tadfisher · on Feb 26, 2013

Nah, they just plug in the old Trident renderers. "Browser mode" changes the user agent, and "Document mode" changes the renderer. The JS engine remains the same, which is why you always need to test in the real deal.

esrauch · on Feb 26, 2013

Document mode changes JS compatibility, at least in IE9. I doubt they dropped that in IE10.

http://blogs.msdn.com/b/ie/archive/2011/03/24/ie9-s-document...

gsnedders · on Feb 27, 2013

No, IE 10 has IE 5.5 (quirks — IE6 was where quirks mode was introduced), IE7 "Standards Mode", IE8 "Standards Mode", IE9 "Standards Mode", IE10 "Quirks Mode", and IE10 "Standards Mode".

http://hsivonen.iki.fi/doctype/ie8-mode.png is a flow-chart of the modes and switches for them as of IE8.