How can i make a CSS drop down menu accessible for keyboard navigation?

Question

I saw already some solutions, but i can't figure out how can i put some of these solutions in my code, or some solutions uses something that i can't use in my project.

Let's go to the question:

I need to make an already existing CSS drop-down menu accessible for keyboard navigation. I got some progress in opening the drop-down menu with [Tab] but i can't navigate into the options inside.

Here is my code:

    .menu .options-menu-dropdown{
        display: inline-block;
        font-family: 'OpenSans Bold';
        font-size: 16px;
        color: #646464;        
        text-decoration: none;
        cursor: pointer;
        position: relative;
    }
    .menu .menu-dropdown{
        z-index: -1;
        visibility: hidden;
        opacity: 0;
        position: absolute;
        top: 0;
        right: 0;
        min-width: 180px;
        text-align: right;
        overflow: hidden;
        margin-top: -6px;
        margin-right: -6px;

        -webkit-transition: all 200ms ease-in-out;
        -moz-transition: all 200ms ease-in-out;
        -ms-transition: all 200ms ease-in-out;
        -o-transition: all 200ms ease-in-out;
        transition: all 200ms ease-in-out;    
    }
.menu .options-menu-dropdown:focus .menu-dropdown,
    .menu .options-menu-dropdown:hover .menu-dropdown{
        z-index: 100;
        visibility: visible;
        opacity: 1;
    }
    .menu .title-dropdown{
        background-color: #005e8b;
        font-size: 16px;
        padding: 8px 6px;
        white-space: nowrap;
        border-bottom: 1px solid #b4b4b4;
        color: #FFF;
    }
    .menu .menu-dropdown-item{
        display: block;
        background-color: white;        
        padding: 12px 32px 12px 12px;
        text-decoration: none;
        cursor: pointer;
        font-size: 16px;
        color: #323232;
        -webkit-transition: all 200ms ease-in-out;
        -moz-transition: all 200ms ease-in-out;
        -ms-transition: all 200ms ease-in-out;
        -o-transition: all 200ms ease-in-out;
        transition: all 200ms ease-in-out; 
        border-top: #b4b4b4 1px solid;
        border-left: #b4b4b4 1px solid;
        border-right: #b4b4b4 1px solid;
    }
    .menu .menu-dropdown-item:last-child{
        border-bottom: #b4b4b4 1px solid;
    }
  .menu .menu-dropdown-item:focus,
    .menu .menu-dropdown-item:hover{
        background-color: #b4b4b4;
        color: #fff;
    }

<div class="menu" align="center" >
  <div class="options-menu-dropdown" tabindex="0">
    <div>Test Menu</div>
    <div class="menu-dropdown">
      <div class="title-dropdown">Opened Test Menu</div>
      <a href="#" class="menu-dropdown-item" tabindex="1">Menu Item 1</a>
      <a href="#" class="menu-dropdown-item" tabindex="1">Menu Item 2</a>
      <a href="#" class="menu-dropdown-item" tabindex="1">Menu Item 3</a>
    </div>
  </div>
</div>

code http://codepen.io/WillCodebit/pen/XpaqqJ

Note: I'm trying to avoid any javascript solution, because in this project I need to use GWT for any javascript, it is a pattern that I can't violate.

Thanks in advance.

EDIT This menu should have a similar behavior than the account menu of Google. And the options inside must be accessible by keyboard too.

Answer 1

Thanks to Shannon Youg who tried to help.

I found a solution, but I had to put some Javascript to make it work.

HTML:

<div class="my-menu">
  <a id="menuUser" href="javascript:showHideMenu()" class="">
    <div>
      Test
    </div>
  </a>
  <ul id="menuUserDropdown" class="menu-dropdown">
    <li>
      <a href="#" class="menu-dropdown-item">
        Option 1
      </a>
    </li>
    <li>
      <a href="#" class="menu-dropdown-item">
        Option 2
      </a>
    </li>
    <li>
      <a href="#" class="menu-dropdown-item">
        Option 3
      </a>
    </li>
  </ul>
</div>

CSS:

.my-menu a{
  display: inline-block;
  font-family: 'OpenSans Bold';
  font-size: 16px;
  color: #646464;
  text-decoration: none;
  cursor: pointer;
  position: relative;
}
.my-menu a div{
  padding: 4px 5px 4px 0;
}
.my-menu a.opened div,
.my-menu a:hover div{
  background-color: #c9252b;
  color: #fff;
}
.my-menu .menu-dropdown.opened{
  display: block;
}
.my-menu div{
  display: inline-block;
  vertical-align: middle;
}
.my-menu .menu-dropdown{
  display: none;
  margin: 0;
  position: absolute;
  z-index: 30;
  background-color: #FFF;
  list-style: none;
  padding: 0;
  border: 1px solid #b4b4b4;
}
.my-menu .menu-dropdown-item{
  display: block;
  background-color: white;
  padding: 12px;
  text-decoration: none;
  width: 162px;
  cursor: pointer;
  font-size: 16px;
  color: #323232;
}
.my-menu .menu-dropdown-item:focus,
.my-menu .menu-dropdown-item:hover{
  background-color: #b4b4b4;
  color: #fff;
}

Javascript, well, I made with GWT, but the logic is simple:

/* Just add or remove the class "opened" from "menuUser" and "menuUserDropdown".
    You can put a "blur()" and "mouseLeave()" functions 
    to close the menu when the user moves away the cursor or 
    move the focus out of the menu too. */