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HTML

              
                <button type="button" id="hamburger-menu" class="open-nav-btn" aria-haspopup="dialog"><span aria-hidden="true">&#9776;</span>Menu</button>
  <div role="dialog" aria-label="main menu" aria-modal="true" id="slide-nav" class="slide-content">
     <h2 id="title" class="sr-only">Main Menu</h2>
    <button type="button" id="close" class="close-btn" aria-label="close main menu">&times;</button>
    <nav>
        <ul id="link-list">
          <li><a href="#">Services</a></li>
          <li><a href="#">Programs</a>
          <li><a href="#">Blog</a></li>
          <li><a href="#">About</a></li>
          <li><a href="#">Contact</a></li>
        </ul>
    </nav>
  </div>

<main>
  <h1>Dialog Hamburger Menu</h1>

    <p>Based on <a href="https://codepen.io/unleashalicia/pen/YzXrJBN">Slide-Out Navigation by Alicia Evans</a></p>
    <ul>
        <li>Added the word "Menu" under the hamburger symbol.</li>
        <li>Added aria-haspopup="dialog" to the trigger button.</li>
        <li>Removed aria-expanded from the trigger button.</li>
        <li>Added role="dialog", aria-labelledby="title" (attached to visually hidden title) and aria-modal="true" to the menu container.</li>
        <li>Added the nav element around the menu list.</li>
    </ul>

    <p>This pattern is intended to be used on a responsive view only. It displays on desktop view only to facilitate the sharing of the demo.</p>
</main>
              
            
!

CSS

              
                body {
  font-family: "Arial", sans-serif;
  background-color: #F5F5F5;
}

#title.sr-only:not(:focus):not(:active) {
  clip: rect(0 0 0 0); 
  clip-path: inset(50%);
  height: 1px;
  overflow: hidden;
  position: absolute;
  white-space: nowrap; 
  width: 1px;
}

button.open-nav-btn {
  font-size: 1rem;
  border: 1px solid black;
  background-color: transparent;
  margin: 10px;
}
button span{
    display:block;
    font-size: 2rem;
}

.slide-content {
  height: 100%;
  width: 0;
  position: fixed;
  z-index: 1;
  top: 0;
  left: 0;
  background-color: black;
  overflow-x: hidden;
  transition: width 0.5s;
  padding-top: 60px;
  visibility: hidden;
}

.slide-content a {
  padding: 8px 8px 8px 32px;
  text-decoration: none;
  font-size: 25px;
  color: #F5F5F5;
  display: block;
}

.slide-content a:focus,
.slide-content button:focus {
  outline: 2px solid orange;
}

#link-list {
    list-style:none;
}
main a:focus,
.open-nav-btn:focus {
  outline: 2px solid blue;
  outline-offset: 5px;
}

.close-btn {
  font-size: 25px;
  color: #F5F5F5;
  background-color: transparent;
  border: none;
}

.slide-content a:hover,
.slide-content a:focus {
  text-decoration: underline;
}

.slide-content .close-btn {
  position: absolute;
  top: 0;
  right: 25px;
  font-size: 36px;
  margin-left: 50px;
}

.visible {
  visibility: visible;
}

.active {
  width: 250px;
}
              
            
!

JS

              
                document.documentElement.setAttribute("lang", "en");

// jQuery element variables
var $hamburgerMenuBtn,
    $slideNav,
    $closeBtn,
    $main;

// focus management variables
var $focusableInNav,
    $firstFocusableElement,
    $lastFocusableElement;

$(document).ready(function() {
  $hamburgerMenuBtn = $("#hamburger-menu"),
    $slideNav = $("#slide-nav"),
    $closeBtn = $("#close"),
    $main = $("main"),
    $focusableInNav = $('#slide-nav button, #slide-nav [href], #slide-nav input, #slide-nav select, #slide-nav textarea, #slide-nav [tabindex]:not([tabindex="-1"])');
  if ($focusableInNav.length) {
    $firstFocusableElement = $focusableInNav.first();
    $lastFocusableElement = $focusableInNav.last();
  }
  addEventListeners();
});

function addEventListeners() {
  $hamburgerMenuBtn.click(openNav);
  $closeBtn.click(closeNav);
  $slideNav.on("keyup", closeNav);
  $firstFocusableElement.on("keydown", moveFocusToBottom);
  $lastFocusableElement.on("keydown", moveFocusToTop);
}

function openNav() {
  $slideNav.addClass("visible active");
  setTimeout(function() {
    $firstFocusableElement.focus()
  }, 1);
  $main.attr("aria-hidden", "true");
  $hamburgerMenuBtn.attr("aria-hidden", "true");
}

function closeNav(e) {
  if (e.type === "keyup" && e.key !== "Escape") {
    return;
  }

  $slideNav.removeClass("active");
  $main.removeAttr("aria-hidden");
  $hamburgerMenuBtn.removeAttr("aria-hidden");
  setTimeout(function() {
    $hamburgerMenuBtn.focus()
  }, 1);
  setTimeout(function() {
    $slideNav.removeClass("visible")
  }, 501);
}

function moveFocusToTop(e) {
  if (e.key === "Tab" && !e.shiftKey) {
    e.preventDefault();
    $firstFocusableElement.focus();
  }
}

function moveFocusToBottom(e) {
  if (e.key === "Tab" && e.shiftKey) {
    e.preventDefault();
    $lastFocusableElement.focus()
  }
}
              
            
!
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