Font-Awesome/docs/assets/less/tw-bs-201/dropdowns.less

// DROPDOWN MENUS
// --------------

// Use the .menu class on any <li> element within the topbar or ul.tabs and you'll get some superfancy dropdowns
.dropdown {
  position: relative;
}
.dropdown-toggle {
  // The caret makes the toggle a bit too tall in IE7
  *margin-bottom: -3px;
}
.dropdown-toggle:active,
.open .dropdown-toggle {
  outline: 0;
}
// Dropdown arrow/caret
.caret {
  display: inline-block;
  width: 0;
  height: 0;
  text-indent: -99999px;
  // IE7 won't do the border trick if there's a text indent, but it doesn't
  // do the content that text-indent is hiding, either, so we're ok.
  *text-indent: 0;
  vertical-align: top;
  border-left:  4px solid transparent;
  border-right: 4px solid transparent;
  border-top:   4px solid @black;
  .opacity(30);
  content: "\2193";
}
.dropdown .caret {
  margin-top: 8px;
  margin-left: 2px;
}
.dropdown:hover .caret,
.open.dropdown .caret {
  .opacity(100);
}
// The dropdown menu (ul)
.dropdown-menu {
  position: absolute;
  top: 100%;
  left: 0;
  z-index: @zindexDropdown;
  float: left;
  display: none; // none by default, but block on "open" of the menu
  min-width: 160px;
  _width: 160px;
  padding: 4px 0;
  margin: 0; // override default ul
  list-style: none;
  background-color: @white;
  border-color: #ccc;
  border-color: rgba(0,0,0,.2);
  border-style: solid;
  border-width: 1px;
  .border-radius(0 0 5px 5px);
  .box-shadow(0 5px 10px rgba(0,0,0,.2));
  -webkit-background-clip: padding-box;
     -moz-background-clip: padding;
          background-clip: padding-box;
  *border-right-width: 2px;
  *border-bottom-width: 2px;

  // Allow for dropdowns to go bottom up (aka, dropup-menu)
  &.bottom-up {
    top: auto;
    bottom: 100%;
    margin-bottom: 2px;
  }

  // Dividers (basically an hr) within the dropdown
  .divider {
    height: 1px;
    margin: 5px 1px;
    overflow: hidden;
    background-color: #e5e5e5;
    border-bottom: 1px solid @white;

    // IE7 needs a set width since we gave a height. Restricting just
    // to IE7 to keep the 1px left/right space in other browsers.
    // It is unclear where IE is getting the extra space that we need
    // to negative-margin away, but so it goes.
    *width: 100%;
    *margin: -5px 0 5px;
  }

  // Links within the dropdown menu
  a {
    display: block;
    padding: 3px 15px;
    clear: both;
    font-weight: normal;
    line-height: @baseLineHeight;
    color: @gray;
    white-space: nowrap;
  }
}

// Hover state
.dropdown-menu li > a:hover,
.dropdown-menu .active > a,
.dropdown-menu .active > a:hover {
  color: @white;
  text-decoration: none;
  background-color: @linkColor;
}

// Open state for the dropdown
.dropdown.open {
  // IE7's z-index only goes to the nearest positioned ancestor, which would
  // make the menu appear below buttons that appeared later on the page
  *z-index: @zindexDropdown;

  .dropdown-toggle {
    color: @white;
    background: #ccc;
    background: rgba(0,0,0,.3);
  }
  .dropdown-menu {
    display: block;
  }
}

// Typeahead
.typeahead {
  margin-top: 2px; // give it some space to breathe
  .border-radius(4px);
}