internet explorer - ExtJs4: Quirks mode or Strict mode in IE -


i need know difference quirks mode , strict mode or problem doctype.

i'm developing complex layout app extjs4.2.1: when start develop declare doctype (<!doctype html>) in page. in first experience of test realize there lot of problem css rendering in ie (i test ie9 , ie10), don't see css or autowith of them have problem, icon never visualize etc. try (only test) change class of html document strict quirks mode deleting doctype declaration in page , (for now) work fine.

my question why? there thing have know?


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