html - CSS Pie & IE Meta Tag -

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i've been using css3 pie on site great success. had jotform form custom css button radius, pie doesn't work jotform came across meta tag

<meta http-equiv="x-ua-compatible" content="ie=edge" />

which when added particular page resolved radius issue in ie8.

my question this, if it's simple allow older versions of ie render modern css can tag utilized default , if not why not i.e bad practice, technical reasons etc.

it seems true i'm guessing there has reason, i'm aware doesn't validate avoid can added .htaaccess file.

this meta tag needed prevent ie8—10 switching compatibility mode (which means more or less emulation of ie7 renderer). in cases, it's practice use latest available rendering engine, it's better keep meta tag.

also, sure pages have proper doctype (<!doctype html> enough practical applications), other browsers display them using newest rendering mode, according latest standards browsers can support.


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