Some thoughts on the new Microsoft browser
http://www.quirksmode.org/blog/archives/2014/12/a_new_microsoft.htmlThe plan seems to be that the new IE12 will not carry all that cruft, but be a forward-looking modern browser. If you need legacy stuff you must start up another browser.
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Internally, when talking to other web devs, you should treat the next Microsoft browser as IE12. Externally, however, when talking to clients and other non-techies, it could make sense to support the “Microsoft is creating a new browser” narrative.
I guess we'll see the new browser in action at the Windows 10 event on January 21st.