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HTML 

              
                <!-- Done: Change MQs to ems as that is what menu width/height is based -->
<!-- Done: MQs for tiny displays -->
<!-- Done: MQs for Windows High Contrast Mode -->
<!-- Done: Debug IE menu jumpiness -->
<!-- To-do: Test keyboard nav script -->
<!-- To-do: Browser testing -->
<!-- To-do: Screen reader testing -->
<!-- To-do: Mobile/touch testing -->
<!-- To-do: Standard fly-outs for larger displays -->
<!-- To-do: MQs for desktop display -->
<!-- To-do: Add a 'Home' link for display on smallest screens (that don't get radial menu) -->

<nav role="navigation" tabindex="0" aria-labelledby="NavLbl">
  <h1 id="NavLbl">Menu</h1>
  <ol>
    <li><a href="#Bio">Bio</a>
      <ol>
        <li><a href="#Bio1">Bio One</a></li>
        <li><a href="#Bio2">Bio Two</a></li>
        <li><a href="#Bio3">Bio Three</a></li>
      </ol>
    </li>
    <li><a href="#Blog">Blog</a></li>
    <li><a href="#Books">Books</a>
      <ol>
        <li><a href="#Books1">Book Title 1</a></li>
        <li><a href="#Books2">Second Book Title</a></li>
        <li><a href="#Books3" aria-label="Current Page: The Third Book Title">The Third Book Title</a></li>
        <li><a href="#Books4">I wrote a Fourth Book</a></li>
        <li><a href="#Books5">Five Fricking Books</a></li>
        <li><a href="#Books6">I Did Not Write A Sixth Book</a></li>
      </ol>
    </li>
    <li><a href="#Articles">Articles</a>
      <ol>
        <li><a href="#Archive1">Archive</a></li>
        <li><a href="#Archive2">Archive</a></li>
        <li><a href="#Archive3">Archive</a></li>
        <li><a href="#Archive4">Archive</a></li>
        <li><a href="#Archive5">Archive</a></li>
        <li><a href="#Archive6">Archive</a></li>
        <li><a href="#Archive7">Archive</a></li>
        <li><a href="#Archive8">Archive 8</a></li>
        <li><a href="#Archive9">Archive 9</a></li>
      </ol>
    </li>
    <li><a href="#Contact">Contact</a>
      <ol>
        <li><a href="#Contact1">Phone</a></li>
        <li><a href="#Contact2">Email</a></li>
        <li><a href="#Contact3">Stalk</a></li>
        <li><a href="#Contact4">Twitter</a></li>
        <li><a href="#Contact5">Tumblr</a></li>
        <li><a href="#Contact6">Car</a></li>
      </ol>
    </li>
    <li><a href="#Fake6">Fake 6th Item</a></li>
   </ol>
</nav>

<main>
  <h1>Radial (Sub-)Menu Experiment</h1>
  <p>
    New, Improved and Chocolatey!
  </p>
  <p>
    I have taken my first two radial menu samples (<a href="https://codepen.io/aardrian/pen/vFKuq">the first cut</a> and the <a href="https://codepen.io/aardrian/pen/HjwLr">second cut with a sub-menu</a>) and re-written them from scratch. Mostly to play around, partly to compare code from two-and-a-half years ago and see how my approach has changed. I also wrote a <a href="http://blog.adrianroselli.com/2012/08/css-only-radial-menu-experiments.html">blog post</a> some time ago (August 2012) outlining what I built before.
  </p>
  <p>
    All sizing is based on ems, so if you kick up the default font size (on the <code>body</code>) you'll see the menu, text, borders, etc. scale.
  </p>
  <p>
    I use <code>aria-label</code> to identify which item is the current page/section, using a CSS attribute selector to style accordingly (<em>Books</em> &gt; <em>The Third Book</em>). I use jQuery to walk up the DOM to find the parent anchor, which assumes I would be stuck on a CMS that won't allow this to be done server-side (which would be lame). I'm still not sold on using an <code>h1</code> in the <code>nav</code>, but at least I use <code>aria-labelledby</code> to essentially make it a label for the entire thing. 
  </p>
  <p>
    I have added keyboard support with some jQuery, though I'd like to re-write to vanilla JS so there are no external dependencies. Without scripting it doesn't work as I rely on hover/focus states on the <code>li</code> elements. I also need to test it more on touch displays.
  </p>
  <p>
    This is nowhere near ready for production. I have a media query that kills this above a certain width (set high for now) as I expect to have more traditional styles for desktop. Have added em-based height &amp; media queries to convert to block nav for smaller screens where menu options won't fit. Added styles for Windows High Contrast Mode.
  </p>
  <p>
    This menu also only allows for 5 primary items, and 6 secondary items per primary item, except for the first (4 items max) and the last (3 items max). I adjust the positioning on the first &amp; last sub-menus to account for the screen edge. As such, it only allows for two tiers of navigation. That's not a very extensible menu, but as I am building it for my own site, it fits my needs.
  </p>
  <p>
    Ideas for a better approach to the keyboard support scripting are appreciated. I wrote these from scratch, which guarantees they are crap.
  </p>
</main>
!

CSS 

              
                @import url(https://fonts.googleapis.com/css?family=Lato:400,700);

body {
  background-color: #6D695C;
  background-image: url(data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABAAAAAQCAMAAAAoLQ9TAAAACVBMVEUAAAAAAAAAAACDY+nAAAAAA3RSTlMmDQBzGIDBAAAAG0lEQVR42uXIIQEAAADCMHj/0NdkQMws0HEeAqvwAUGJthrXAAAAAElFTkSuQmCC);
  font-size: 100%;
  color: #fff;
  font-family: Lato, Arial, sans-serif;
  padding: 0;
  margin: 0;
}

main {
  display: block;
  box-sizing: border-box;
  width: 90%;
  margin: 1em auto;
  padding: 1em;
  color: #000;
  background-color: rgba(255,255,255,.25);
  border: .07em solid rgba(0,0,0,.5);
  border-radius: .5em;
}

a {
  color: #009;
}

/* The fully-expanded menu is just over 23em, so this will show another menu up to that width or height. */

@media (max-width:23em), (max-height:22em) {

  nav {
    /*border: 1px dotted #f00;*/
    box-sizing: border-box;
    padding: 0;
    margin: 0;
    background-color: #000;
  }
  
  nav::after {
    content: "";
    display: block;
    clear: both;
  }
  
  nav h1 {
    display: none;
  }
  
  nav ol, nav li {
    margin: 0;
    padding: 0;
    list-style-type: none;
  }
  
  nav ol ol {
    display: none;
  }
  
  nav a {
    display: block;
    box-sizing: border-box;
    width: 50%;
    float: left;
    margin: 0;
    padding: 1em 0;
    text-align: center;
    color: #fff;
    background-color: #000;
    text-decoration: none;
    outline: none;
    border: .07em solid #333;
  }
  
  nav li:hover a, nav li:focus a, nav li.focus a {
    background-color: #222;
    outline: none;
  }
  
  nav>ol>li a[aria-label^="Current"], nav>ol>li:hover a[aria-label^="Current"], nav>ol>li:focus a[aria-label^="Current"] {
    color: #444;
  }
  
}

/* Short, wide display */

@media (min-width:23em) and (max-height:22em) {
  
  nav a {
    width: 33.333%;
  }
  
}

/* Short, wider display */

@media (min-width:32em) and (max-height:22em) {
  
  nav a {
    width: 25%;
  }
  
}

/* Short, wider display */

@media (min-width:40em) and (max-height:22em) {
  
  nav a {
    width: 20%;
  }
  
}

/* Short, even wider display */

@media (min-width:48em) and (max-height:22em) {
  
  nav a {
    width: 16.666667%;
  }
  
}

/* The screen is now wide and tall enough to show the entire menu without cutting anything off. */

@media (min-width:23em) and (max-width:1800px) and (min-height:22em) {

  nav {
    /*border: 1px dotted #f00;*/
    box-sizing: border-box;
    position: fixed;
    top: 0;
    right: 0;
    padding: 0;
    border-radius: 0 0 0 100%;
    width: 2em;
    height: 2em;
    /*overflow: hidden;*/
    transition: all .25s ease-in;
  }
  
  nav:hover, nav:focus, nav.focus {
    background-color: rgba(0, 0, 0, 0.4);
    width: 18em;
    height: 17em;
    outline: none;
  }
  
  nav h1 {
    box-sizing: border-box;
    font-size: 100%;
    text-transform: uppercase;
    font-weight: normal;
    /*border: 1px dotted yellow;*/
    position: fixed;
    top: 0;
    right: 0;
    margin: 0;
    padding: 1em .5em 2.3em 1.8em;
    border-left: .15em solid #fff;
    border-bottom: .15em solid #fff;
    background-color: #000;
    border-radius: 0 0 0 100%;
    z-index: 50;
  }
  
  nav ol, nav li {
    margin: 0;
    padding: 0;
    list-style-type: none;
  }
  
  nav li {
    position: absolute;
  }
  
  nav li, nav a {
    display: block;
    box-sizing: border-box;
    /*position: absolute;*/
    /*position: relative;*/
    top: -5em;
    right: -5em;
    /*border: 1px dotted #f00;*/
    transition: all 0.2s ease-in;
  }
  
  nav a {
    border-radius: 100%;
    border: .15em solid #fff;
    padding: 1.5em 0;
    width: 4.5em;
    height: 4.5em;
    overflow: hidden;
    text-align: center;
    box-shadow: 0 0 1.5em rgba(50, 50, 50, 0.75);
    color: #fff;
    background-color: #000;
    text-decoration: none;
    outline: none;
  }
  
  nav>ol>li, nav>ol>li>a {
    /* So the first tier sits on top of the second tier disk */
    z-index: 10;
  }
  
  nav li:hover a, nav li:focus a, nav li.focus a {
    background-color: #222;
    box-shadow: 0 0 1.5em rgba(0, 0, 0, 1);
    outline: none;
    position: relative;
    left: 0;
    top: auto;
    /*z-index: 25;*/
  }
  
  nav>ol>li:hover, nav>ol>li:focus, nav>ol>li.focus {
    /* Keep this to make sure only the current item appears above the disc. */
    z-index: 25;
  }
  
  /* Just hide anything beyond 5*/
  
  nav>ol>li:nth-child(n+6) {
    display: none;
  }

/* Positioning the first tier */

  nav:hover>ol>li:nth-child(1), nav:focus>ol>li:nth-child(1), nav.focus>ol>li:nth-child(1) {
    right: 13.5em;
    top: .2em;
  }
  
  nav:hover>ol>li:nth-child(2), nav:focus>ol>li:nth-child(2), nav.focus>ol>li:nth-child(2) {
    right: 12em;
    top: 4.75em;
  }
  
  nav:hover>ol>li:nth-child(3), nav:focus>ol>li:nth-child(3), nav.focus>ol>li:nth-child(3) {
    right: 9.0em;
    top: 8.5em;
  }
  
  nav:hover>ol>li:nth-child(4), nav:focus>ol>li:nth-child(4), nav.focus>ol>li:nth-child(4) {
    right: 5em;
    top: 11.25em;
  }
  
  nav:hover>ol>li:nth-child(5), nav:focus>ol>li:nth-child(5), nav.focus>ol>li:nth-child(5) {
    right: .4em;
    top: 12.5em;
  }
  
/* Positioning the second tier */
  
  nav>ol>li>ol {
    background-color: rgba(0, 0, 0, 0);
    width: 0;
    height: 0;
    display: block;
    position: absolute;
    border-radius: 100%;
    transition: all .2s ease-in;
    left: 2.25em;
    top: 2.25em;
    left: 0;
    top: 0;
    /*z-index: 1;*/
    /*border: 1px dotted yellow;*/
  }
  
  nav>ol>li:hover>ol, nav>ol>li:focus>ol, nav>ol>li.focus>ol {
    width: 15em;
    height: 15em;
    /*z-index: 1;*/
    /*top: -4.75;
    left: -4.75;*/
    margin-top: -5.25em;
    margin-left: -5.25em;
    background-color: rgba(0, 0, 0, 0.6);
  }
  
  nav>ol>li>ol>li, nav>ol>li>ol>li a {
    position: absolute;
    /*border-color: #99f;*/
    transition: all .2s ease-in;
    top: 0;
    left: 0;
    /*z-index: 1;*/
    /*left: 4.5em;
    top: 0;*/
  }
  
  nav>ol>li>ol>li a {
    border-color: #f60;
    box-shadow: none;
    transition: all .2s ease-in;
    display: none;
  }
  
  nav>ol>li:hover>ol>li, nav>ol>li:focus>ol>li, nav>ol>li.focus>ol>li {
    /*box-shadow: 0 0 1.5em rgba(50, 50, 50, 0.75);*/
    z-index: 5;
  }
  
  nav>ol>li:hover>ol>li a, nav>ol>li:focus>ol>li a, nav>ol>li.focus>ol>li a {
    background-color: #000;
    box-shadow: none;
    z-index: 5;
    display: block;
  }
  
  nav>ol>li>ol>li a:hover, nav>ol>li>ol>li a:focus {
    background-color: #222;
    box-shadow: 0 0 1.5em rgba(0, 0, 0, 1);
  }

  /* Position individual items */
  
  nav>ol>li:hover>ol>li:nth-child(1), nav>ol>li:focus>ol>li:nth-child(1), nav>ol>li.focus>ol>li:nth-child(1), nav>ol>li:nth-child(5):hover>ol>li:nth-child(3), nav>ol>li:nth-child(5):focus>ol>li:nth-child(3), nav>ol>li:nth-child(5).focus>ol>li:nth-child(3) {
    left: 2.75em;
    top: 1em;
  }

  nav>ol>li:hover>ol>li:nth-child(2), nav>ol>li:focus>ol>li:nth-child(2), nav>ol>li.focus>ol>li:nth-child(2) {
    left: 7.75em;
    top: 1em;
  }

  nav>ol>li:hover>ol>li:nth-child(3), nav>ol>li:focus>ol>li:nth-child(3), nav>ol>li.focus>ol>li:nth-child(3), nav>ol>li:nth-child(1):hover>ol>li:nth-child(1), nav>ol>li:nth-child(1):focus>ol>li:nth-child(1), nav>ol>li:nth-child(1).focus>ol>li:nth-child(1) {
    left: 10.25em;
    top: 5.25em;
  }

  nav>ol>li:hover>ol>li:nth-child(4), nav>ol>li:focus>ol>li:nth-child(4), nav>ol>li.focus>ol>li:nth-child(4), nav>ol>li:nth-child(1):hover>ol>li:nth-child(2), nav>ol>li:nth-child(1):focus>ol>li:nth-child(2), nav>ol>li:nth-child(1).focus>ol>li:nth-child(2) {
    left: 7.75em;
    top: 9.5em;
  }

  nav>ol>li:hover>ol>li:nth-child(5), nav>ol>li:focus>ol>li:nth-child(5), nav>ol>li.focus>ol>li:nth-child(5), nav>ol>li:nth-child(1):hover>ol>li:nth-child(3), nav>ol>li:nth-child(1):focus>ol>li:nth-child(3), nav>ol>li:nth-child(1).focus>ol>li:nth-child(3), nav>ol>li:nth-child(5):hover>ol>li:nth-child(1), nav>ol>li:nth-child(5):focus>ol>li:nth-child(1), nav>ol>li:nth-child(5).focus>ol>li:nth-child(1) {
    left: 2.75em;
    top: 9.5em;
  }
  
  nav>ol>li:hover>ol>li:nth-child(6), nav>ol>li:focus>ol>li:nth-child(6), nav>ol>li.focus>ol>li:nth-child(6), nav>ol>li:nth-child(1):hover>ol>li:nth-child(4), nav>ol>li:nth-child(1):focus>ol>li:nth-child(4), nav>ol>li:nth-child(1).focus>ol>li:nth-child(4), nav>ol>li:nth-child(5):hover>ol>li:nth-child(2), nav>ol>li:nth-child(5):focus>ol>li:nth-child(2), nav>ol>li:nth-child(5).focus>ol>li:nth-child(2) {
    left: .25em;
    top: 5.25em;
  }
  
  /* Just hide anything beyond 6. */

  nav>ol>li>ol>li:nth-child(n+7), nav>ol>li:hover>ol>li:nth-child(n+7), nav>ol>li:focus>ol>li:nth-child(n+7), nav>ol>li.focus>ol>li:nth-child(n+7) {
    display: none;
  }
  
  /* Hide from 5 items and up on the first menu. */
  
  nav>ol>li:nth-child(1):hover>ol>li:nth-child(n+5), nav>ol>li:nth-child(1):focus>ol>li:nth-child(n+5), nav>ol>li:nth-child(1).focus>ol>li:nth-child(n+5) {
    display: none;
  }
  
  /* Hide from 4 items and up on the last menu.*/
  
  nav>ol>li:nth-child(5):hover>ol>li:nth-child(n+4), nav>ol>li:nth-child(5):focus>ol>li:nth-child(n+4), nav>ol>li:nth-child(5).focus>ol>li:nth-child(n+4) {
    display: none;
  }

  /* Style links that are current page/section. */
  
  nav>ol>li a[aria-label^="Current"], nav>ol>li:hover a[aria-label^="Current"], nav>ol>li:focus a[aria-label^="Current"] {
    color: #666;
    border-color: #999;
  }
  
}

@media screen and (-ms-high-contrast: active) {
  nav>ol>li a[aria-label^="Current"], nav>ol>li:hover a[aria-label^="Current"], nav>ol>li:focus a[aria-label^="Current"] {
    background-color: #00c;
  }
  
}
!

JS 

              
                /* For any clicks, clear the focus class from the nav and all its descendants, essentially closing the menu when a user clicks/taps outside of it. */
$(document).click(function(e) {
  $("nav *, nav").removeClass("focus");
});

/* Manipulate focus classes in navigation. */
function classy(){
  $("nav *, nav").removeClass("focus");
  $("nav:focus").addClass("focus");
  $("nav a:focus").addClass("focus");
  $("nav a:focus").parentsUntil("body").addClass("focus");
}

/* Delay the assigning of classes to give the :focus a chance to catch up. There has to be a better way for this. */
$(document).keydown(function() {
  setTimeout(classy, 200);
});

/* Find the current page and add the aria-label to its site structure parent, which you should only use if you can't do this server-side in your CMS of choice. */
$(document).ready(function() {
  var el = $("a[aria-label^='Current Page']");
  var elParent = el.parent().parent().parent("li").children("a");
  var elTxt = elParent.text();
  elParent.attr("aria-label", "Current Section: " + elTxt);
});
!
999px

Console