html - Bootstrap's responsiveness not working -


i developed website using bootstrap 3 , looked fine on browser,i using firefox , tried responsive design layout in developers tool , website works fine nav-menus works great when uploded test , tried mobile phone using multiple browsers doesnt how suppose ,the nav-manus didnt shrink collapsible button seem know problem ?any comment full thanks. know suppose post codes code lot posted.

write code in head if didn't

<meta name="viewport" content="width=device-width, initial-scale=1.0" /> 

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