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HTML

              
                <header>
  <nav id="Nav">
    <ul>
      <li><a href="http://example.com/?1" id="item01">Home</a></li>
      <li class="selected">
        <a href="http://example.com/?2" id="Item02" aria-current="page">About</a>
        <button type="button" id="btnItem02" aria-controls="SubItem02" aria-expanded="false" aria-label="Show" aria-labelledby="btnItem02 Item02" onclick="toggleSubNav(this.id);">
        <svg xmlns="http://www.w3.org/2000/svg&quot;" viewBox="0 0 80 80" focusable="false"><path d="M70.3 13.8L40 66.3 9.7 13.8z"></path></svg>
          </button>
        <ul id="SubItem02" style="display:none;">
          <li><a href="http://example.com/?2a">Our Team</a></li>
          <li><a href="http://example.com/?2b">Press</a></li>
          <li><a href="http://example.com/?2c">Contact</a></li>
          <li><a href="http://example.com/?2d" aria-current="page">Job Postings</a></li>
        </ul>
      </li>
      <li><a href="http://example.com/?3" id="Item03">Blog</a></li>
      <li><a href="http://example.com/?4" id="Item04">Services</a>
        <button type="button" id="btnItem04" aria-controls="SubItem04" aria-expanded="false" aria-label="Show" aria-labelledby="btnItem04 Item04" onclick="toggleSubNav(this.id);">
        <svg xmlns="http://www.w3.org/2000/svg&quot;" viewBox="0 0 80 80" focusable="false"><path d="M70.3 13.8L40 66.3 9.7 13.8z"></path></svg>
          </button>
        <ul id="SubItem04" style="display:none;">
          <li><a href="http://example.com/?4a">Management Consulting</a></li>
          <li><a href="http://example.com/?4b">Training</a></li>
          <li><a href="http://example.com/?4c">Financial Audits</a></li>
          <li><a href="http://example.com/?4d">Expert Witness</a></li>
          <li><a href="http://example.com/?4e">Localization</a></li>
          <li><a href="http://example.com/?4f">Writing Very Nasty Letters</a></li>
        </ul>
      </li>
      <li>
        <a href="http://example.com/?5" id="Item05">Products</a>
        <button type="button" id="btnItem05" aria-controls="SubItem05" aria-expanded="false" aria-label="Show" aria-labelledby="btnItem05 Item05" onclick="toggleSubNav(this.id);">
        <svg xmlns="http://www.w3.org/2000/svg&quot;" viewBox="0 0 80 80" focusable="false"><path d="M70.3 13.8L40 66.3 9.7 13.8z"></path></svg>
          </button>
        <ul id="SubItem05" style="display:none;">
          <li><a href="http://example.com/?5a">Content Management Systems</a></li>
          <li><a href="http://example.com/?5b">Translation Management Software</a></li>
          <li><a href="http://example.com/?5c">Dessert Topping</a></li>
          <li><a href="http://example.com/?5d">Floor Wax</a></li>
        </ul>
      </li>
      <li>
        <a href="http://example.com/?6" id="Item06">Events</a>
        <button type="button" id="btnItem06" aria-controls="SubItem06" aria-expanded="false" aria-label="Show" aria-labelledby="btnItem06 Item06" onclick="toggleSubNav(this.id);">
        <svg xmlns="http://www.w3.org/2000/svg&quot;" viewBox="0 0 80 80" focusable="false"><path d="M70.3 13.8L40 66.3 9.7 13.8z"></path></svg>
          </button>
        <ul id="SubItem06" style="display:none;">
          <li><a href="http://example.com/?6a">Press Events</a></li>
          <li><a href="http://example.com/?6b">Conferences</a></li>
          <li><a href="http://example.com/?6c">Workshops</a></li>
          <li><a href="http://example.com/?6d">Algonquinpalooza</a></li>
        </ul>
      </li>
      <li><a href="http://example.com/?7" id="Item07">Contact</a>
        <button type="button" id="btnItem07" aria-controls="SubItem07" aria-expanded="false" aria-label="Show" aria-labelledby="btnItem07 Item07" onclick="toggleSubNav(this.id);">
        <svg xmlns="http://www.w3.org/2000/svg&quot;" viewBox="0 0 80 80" focusable="false"><path d="M70.3 13.8L40 66.3 9.7 13.8z"></path></svg>
          </button>
        <ul id="SubItem07" style="display:none;">
          <li><a href="http://example.com/?7a">Phone</a></li>
          <li><a href="http://example.com/?7b">Mailing Address</a></li>
          <li><a href="http://example.com/?7c">Summoning Circles</a></li>
        </ul>
      </li>
    </ul>
  </nav>
</header>
<main>
  <h1>Navigation</h1>
  <p>
    Prototype navigation pattern. Read more in my blog post <a href="http://adrianroselli.com/2019/06/link-disclosure-widget-navigation.html"><cite>Link + Disclosure Widget Navigation</cite></a>.
  </p>
</main>
              
            
!

CSS

              
                @import url('https://fonts.googleapis.com/css?family=Open+Sans');

body {
  background-color: #eeeeee;
  font-size: 100%;
  color: #333;
  font-family: "Segoe UI", -apple-system, BlinkMacSystemFont, Roboto,
    Oxygen-Sans, Ubuntu, Cantarell, "Helvetica Neue", sans-serif;
  padding: 0;
  margin: 0;
}

header,
nav,
main {
  display: block;
  box-sizing: border-box;
  width: auto;
  padding: 1em 1vw;
  margin: 1em 1vw;
  color: #000;
}

header,
nav {
  padding: 0;
  margin: 0;
}

nav {
  margin-top: 0.5em;
  background-color: #ddd;
  font-size: 90%;
}

nav ul,
nav li {
  list-style-type: none;
  margin: 0;
  padding: 0;
}

nav > ul {
  display: flex;
  flex-wrap: no-wrap; /* RWD */
  justify-content: space-evenly;
  align-items: stretch;
}

nav > ul > li {
  flex: 1 1 auto; /* RWD */
  margin: 0;
  display: flex;
  flex-wrap: nowrap;
  align-items: flex-start;
  align-content: flex-start;
  padding: 0 1em;
  border-right: 0.1em solid #ccc;
  border-bottom: 0.1em solid #ccc;
  position: relative;
}

nav > ul > li:first-child {
  border-left: 0.1em solid #ccc;
}

nav > ul > li > a {
  padding: 1em 0;
  text-align: center;
}

nav > ul > li > * {
  flex: 1 1 auto;
  box-sizing: border-box;
}

nav > ul > li > button {
  flex: 0 0 1em;
  border: 0.15em solid #000;
  border-radius: 50%;
  line-height: 0;
  outline: none;
  text-align: center;
  padding: 0.15em 0.15em 0.05em 0.15em;
  margin: 1.1em 1em 0 1em;
}

nav > ul > li > a + button svg {
  width: 1em;
  height: 1em;
  fill: #000;
  transition: transform 0.25s ease-in;
  transform-origin: center 45%;
}

button[aria-expanded="true"] svg {
  transform: rotate(180deg);
}

nav > ul li > ul {
  position: absolute;
  top: 100%;
  left: -0.1em;
  right: -0.5em;
  width: auto;
  min-width: 12em;
  height: auto;
  overflow: visible;
  z-index: 10;
  margin: 0;
  padding: 1em 0;
  border: 0.01em solid transparent;
}

nav > ul ul a {
  display: block;
  font-size: 95%;
  margin: 0;
  padding: 0.5em 1.3em;
}

nav > ul ul a:hover,
nav > ul ul a:focus {
  background-color: #ccc;
}

@media screen and (min-width: 60em) {
  /* At arbitrary desktop width, keep right menu from going out of viewport */
  nav > ul li:last-child > ul {
    left: auto;
    right: 0;
  }
}

@media screen and (max-width: 60em) {
  body {
    background-color: #ffe;
  }
  nav > ul {
    /* Has to happen in a max-width MQ */
    /* Sorry, no mobile-first in this case */
    flex-wrap: wrap; /* RWD */
  }
  nav > ul > li {
    border-right: 0.05em solid #ccc;
    border-left: 0.05em solid #ccc;
  }
  nav > ul > li:first-child {
    border-left-width: 0.05em;
  }
  nav > ul li > ul {
    right: 0;
  }
}

@media screen and (-ms-high-contrast: active) {
  nav {
    border-top: 0.1em solid windowText;
  }
}

/* Colors */

nav,
nav ul,
nav button,
nav > ul ul a:hover,
nav > ul ul a:focus {
  background-color: #013461;
}

nav a,
nav a:link,
nav a:visited,
nav a:hover,
nav a:focus,
nav a:active {
  color: #fff;
  text-decoration: none;
  outline: none;
}

nav > ul > li > a + button svg {
  fill: #fff;
}

nav > ul > li,
nav > ul > li > button,
nav > ul > li:first-child {
  border-color: #0f5f8c;
}

nav > ul > li > button:hover,
nav > ul > li > button:focus {
  border-color: #fff;
}

nav > ul > li:hover,
nav > ul > li > a:hover,
nav > ul > li > a:focus,
nav > ul li > ul {
  background-color: #005c90;
}

nav > ul > li:focus-within {
  /* Keep separate for IE11 */
  background-color: #005c90;
}

nav > ul > li a[aria-current="page"],
nav > ul > li:hover a[aria-current="page"],
nav > ul > li:focus a[aria-current="page"],
nav > ul > li.selected,
nav > ul > li.selected:hover {
  background-color: #187aba;
  border-color: #187aba;
}

              
            
!

JS

              
                
// Get the nav by id
var pNav = document.getElementById("Nav");

function toggleSubNav(eID) {
  try {
    // Get all the top-level items and get the buttons
    var allButtons = document.querySelectorAll("#Nav > ul > li > a + button");
    // Get all sub-menus
    var allSubMenus = document.querySelectorAll("#Nav > ul > li > a + button + ul");
    if (eID !== "") {
      // Get the button
      var toggle = document.querySelector("#" + eID);
      // Find out what the button controls
      var subMenuIdent = toggle.getAttribute("aria-controls");
      // Get that thing it controls
      var subMenu = document.getElementById(subMenuIdent);
      // Toggle text and expanded state
      if (toggle.getAttribute("aria-expanded") === "false") {
        // Loop through all buttons and mark as closed
        for (var i = 0; i < allButtons.length; i++) {
          allButtons[i].setAttribute("aria-expanded", "false");
          allButtons[i].setAttribute("aria-label", "Show");
        //   allButtons[i].innerHTML = arrowShow;
        }
        // Now mark the chosen button as opened
        toggle.setAttribute("aria-expanded", "true");
        toggle.setAttribute("aria-label", "Hide");
      } else {
        // Close chosen button; no need to loop through rest of nodes
        toggle.setAttribute("aria-expanded", "false");
        toggle.setAttribute("aria-label", "Show");
      }
      // Expand or collapse
      if (subMenu.style.display === "none") {
        // Hide all submenus
        for (var i = 0; i < allSubMenus.length; i++) {
          allSubMenus[i].style.display = "none";
        }
        // Show chosen submenu
        subMenu.style.display = "block";
      } else {
        // Close chosen menu; no need to loop through rest of nodes
        subMenu.style.display = "none";
      }
    }
    if (eID !== "") {
    } else {
      // Hide all submenus
      for (var i = 0; i < allSubMenus.length; i++) {
        allSubMenus[i].style.display = "none";
      }
      // Loop through all buttons and mark as closed
      for (var i = 0; i < allButtons.length; i++) {
        allButtons[i].setAttribute("aria-expanded", "false");
        allButtons[i].setAttribute("aria-label", "Show");
        // allButtons[i].innerHTML = arrowShow;
      }
    }
  } catch (e) {
    console.log("toggleSubNav(): " + e);
  }
}

document.onkeydown = function(evt) {
  evt = evt || window.event;
  var isEscape = false;
  if ("key" in evt) {
    isEscape = evt.key == "Escape" || evt.key == "Esc";
  } else {
    isEscape = evt.keyCode == 27;
  }
  if (isEscape) {
    //alert("Escape");
    toggleSubNav("");
  }
};


              
            
!
999px

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