javascript - will also hide if the screen is xs -

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I got confused about how corrupt works do, for example, say I have the following div: - 

  & lt; B class = "hidden-sm" & gt; Your cart: & lt; / B & gt;   
 Then this div will hide the screen is small, but also applies that the screen is extra small  -xs   
 The second question is That I have this div: -  
  & lt; B class = "visible-sm" & gt; Cart: & lt; / B & gt;   
 This means that when the screen is small, the device will be displayed, but when the screen is big, will it be visible?  
 Anyone can advertise, what is this rule governing?   
 
 
 Yes it will.  
 Just in words, the rules are:  
     
  •  If you call  hidden - * , then it will only be hidden on that device width  
  •  If you call  visible - * , then it will only appear at the width of that device.  
  •  If you want to apply it to multiple devices (Xs, SM, MD, LG) if you want to apply it to more than one.

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