JSFiddle - React, Tailwind, and code Playground

HTML

<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.0/js/bootstrap.min.js"></script>
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.0/css/bootstrap.min.css">


<body>

    <div class="navbar navbar-static-top navbar-inverse" style="background-color:purple; margin-top:0px;">
        <div class=" container">


            <button class="navbar-toggle" data-toggle="collapse" data-target=".navHeadCollapse">
                <span class="icon-bar"></span>
                <span class="icon-bar"></span>
                <span class="icon-bar"></span>
            </button>


            <div class="collapse navbar-collapse navHeadCollapse">


                <ul class="nav navbar-nav">

                    <li class="dropdown">

                        <a href="#" class="dropdown-toggle" data-toggle="dropdown" style="color:white">Click Here Please<b class="caret"></b></a> 
                        <ul class="dropdown-menu">
                            <li><a href="http://twitter.com">This Sub Menu floats extends beyond the width of the screen</a>
                            </li>
                            <li><a href="http://twitter.com">This Sub Menu floats extends beyond the width of the screen </a>
                            </li>
                        </ul>
                    </li>


                    <li class="dropdown">

                        <a href="#" class="dropdown-toggle" data-toggle="dropdown" style="color:white">Menu2 Menu2 Menu2<b class="caret"></b></a>
                        <ul class="dropdown-menu">

                        </ul>
                    </li>


                    <li class="dropdown">

                        <a href="#" class="dropdown-toggle" data-toggle="dropdown" style="color:white">Menu2<b class="caret"></b></a>
                        <ul class="dropdown-menu">

                        </ul>
           ...

CSS

.navbar-right .dropdown-menu {
      right: auto;
      left: 0;
}