The “drop-down menu” button must match the press, when pressing does not react at all (it is simply living), it is possible that something is connected, because Lessons 2 years ago, but because of its inexperience, I can not understand what, please help.

p.s. But reacts to the shooter up and down, when they are pressed,

& lt; div class = "btn-group pull-right" & gt;
        & lt; Button class = "BTN BTN-DEFAULT BTN-LG DROPDOWN-Toggle" Data-Toggle = "Dropdown" & gt;
          Drop-down menu & lt; span class = "caret" & gt; & lt; / span & gt;
        & lt; / Button & gt;
        & lt; ul class = "Dropdown-Menu" & gt;
          & lt; li & gt; & lt; a href = "#" & gt; Rend topic Link link Link & lt; / a & gt; & lt; / li & gt;
          & lt; li & gt; & lt; a href = "#" & gt; Rend topic Link link Link & lt; / a & gt; & lt; / li & gt;
          & lt; li & gt; & lt; a href = "#" & gt; Rend topic Link link Link & lt; / a & gt; & lt; / li & gt;
          & lt; li & gt; & lt; a href = "#" & gt; Rend topic Link link Link & lt; / a & gt; & lt; / li & gt;
        & lt; / ul & gt;
      & lt; / div & gt;
& lt; link href = "https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css" REL = "STYLESHEET" / & GT;
& lt; script src = "https://ajax.googleapis.com/ajax/libs/jQuery/11.11/jquery.min.js" & gt; & lt; / script & gt;
& lt; script src = "https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js" & gt; & lt; / script & gt;
& lt;! - jQuery (Necessary for Bootstrap's JavaScript Plugins) - & gt;
& lt; script src = "https://ajax.googleapis.com/ajax/libs/JQuery/12.4/jquery.min.js" & gt; & lt; / script & gt;
& lt;! - Include All Compiled Plugins (Below), OR Include Individual Files As Needed - & GT;
& lt; script src = "js / bootstrap.js" & gt; & lt; / script & gt;

Answer 1, Authority 100%

So everything works. Perhaps you just needed to add “Connecting a boatstrap” in the HD:

& lt; html & gt;
  & lt; Head & gt;
   & lt; link href = "https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css" REL = "STYLESHEET" / & GT;
   & lt; script src = "https://ajax.googleapis.com/ajax/libs/jQuery/11.11/jquery.min.js" & gt; & lt; / script & gt;
   & lt; script src = "https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js" & gt; & lt; / script & gt;
   & lt;! - jQuery (Necessary for Bootstrap's JavaScript Plugins) - & gt;
   & lt; script src = "https://ajax.googleapis.com/ajax/libs/JQuery/12.4/jquery.min.js" & gt; & lt; / script & gt;
   & lt;! - Include All Compiled Plugins (Below), OR Include Individual Files As Needed - & GT;
   & lt; script src = "js / bootstrap.js" & gt; & lt; / script & gt;
  & lt; / Head & gt;
  & lt; Body & gt;
   & lt; div class = "BTN-Group Pull-Right" & gt;
     & lt; Button class = "BTN BTN-DEFAULT BTN-LG DROPDOWN-Toggle" Data-Toggle = "Dropdown" & gt;
     Drop-down menu & lt; span class = "caret" & gt; & lt; / span & gt;
     & lt; / Button & gt;
     & lt; ul class = "Dropdown-Menu" & gt;
      & lt; li & gt; & lt; a href = "#" & gt; Rend topic Link link Link & lt; / a & gt; & lt; / li & gt;
      & lt; li & gt; & lt; a href = "#" & gt; Rend topic Link link Link & lt; / a & gt; & lt; / li & gt;
      & lt; li & gt; & lt; a href = "#" & gt; Rend topic Link link Link & lt; / a & gt; & lt; / li & gt;
      & lt; li & gt; & lt; a href = "#" & gt; Rend topic Link link Link & lt; / a & gt; & lt; / li & gt;
     & lt; / ul & gt;
   & lt; / div & gt;
  & lt; / body & gt;
& lt; / html & gt;