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HTML 

              
                <h1>MDN: Accessible Alternative to <code>title</code> Attribute</h1>

<p>
  This is an effort to remove reliance on the <code>title</code> attribute throughout the MDN web docs. Part of <a href="https://twitter.com/hashtag/HackOnMDN?src=hash">#HackOnMDN</a>.
</p>

<h2>Examples</h2>

<p>
  These are pulled from the the MDN site.
</p>

<h3>Using <code>title</code> Attribute</h3>

<p>
  <span class="seoSummary">The <strong><code>Map</code></strong> object holds key-value pairs.</span> Any value (both objects and <a href="/en-US/docs/Glossary/Primitive" class="glossaryLink" title="primitive values: A primitive (primitive value, primitive data type) is data that is not an object and has no methods. In JavaScript, there are 6 primitive data types: string, number, boolean, null, undefined, symbol (new in ECMAScript 2015).">primitive values</a>)
  may be used as either a key or a value.
</p>

<dl>
  <dt><code>iterable</code></dt>
  <dd>An <a href="/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array" title="The JavaScript Array&nbsp;object is a global object that&nbsp;is used in the&nbsp;construction&nbsp;of&nbsp;arrays; which are high-level, list-like objects."><code>Array</code></a>    or other <a href="/en-US/docs/Web/JavaScript/Guide/iterable">iterable</a> object whose elements are key-value pairs (arrays with two elements, e.g. <code>[[ 1, 'one' ],[ 2, 'two' ]]</code>). Each key-value pair is added to the new <code>Map</code>;
    <code>null</code> values are treated as <code>undefined</code>.</dd>
</dl>

<h3>With <code>aria-describedby</code></h3>

<p>
  <span class="seoSummary">The <strong><code>Map</code></strong> object holds key-value pairs.</span> Any value (both objects and <a href="/en-US/docs/Glossary/Primitive" class="glossaryLink" aria-describedby="Foo1">primitive values<span id="Foo1" aria-hidden="true">primitive values: A primitive (primitive value, primitive data type) is data that is not an object and has no methods. In JavaScript, there are 6 primitive data types: string, number, boolean, null, undefined, symbol (new in ECMAScript 2015).</span></a>)
  may be used as either a key or a value.
</p>

<dl>
  <dt><code>iterable</code></dt>
  <dd>An <a href="/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array" aria-describedby="Foo2"><code>Array</code><span id="Foo2" aria-hidden="true">The JavaScript Array&nbsp;object is a global object that&nbsp;is used in the&nbsp;construction&nbsp;of&nbsp;arrays; which are high-level, list-like objects.</span></a>    or other <a href="/en-US/docs/Web/JavaScript/Guide/iterable">iterable</a> object whose elements are key-value pairs (arrays with two elements, e.g. <code>[[ 1, 'one' ],[ 2, 'two' ]]</code>). Each key-value pair is added to the new <code>Map</code>;
    <code>null</code> values are treated as <code>undefined</code>.</dd>
</dl>

<h3>Using a Following <code>button</code></h3>

<p>
  <span class="seoSummary">The <strong><code>Map</code></strong> object holds key-value pairs.</span> Any value (both objects and <a href="/en-US/docs/Glossary/Primitive" class="glossaryLink" id="Lnk1">primitive values</a> <button type="button" id="Btn1" class="tip-button" aria-labelledby="More1 Lnk1" aria-expanded="false" aria-controls="Bar1" onclick="toggleToolTips(this.id);" data-aria-describedby="Bar1"><span>?</span><span id="More1"> More about</span></button><span id="Bar1" style="display:none;" tabindex="-1">primitive values: A primitive (primitive value, primitive data type) is data that is not an object and has no methods. In JavaScript, there are 6 primitive data types: string, number, boolean, null, undefined, symbol (new in ECMAScript 2015).</span>)
  may be used as either a key or a value.
</p>

<dl>
  <dt><code>iterable</code></dt>
  <dd>An <a href="/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array" id="Lnk2"><code>Array</code></a> <button type="button" id="Btn2" class="tip-button" aria-labelledby="More2 Lnk2" aria-expanded="false" aria-controls="Bar2" onclick="toggleToolTips(this.id);" data-aria-describedby="Bar2"><span>?</span><span id="More2"> More about</span></button><span id="Bar2" style="display:none;" tabindex="-1">The JavaScript Array&nbsp;object is a global object that&nbsp;is used in the&nbsp;construction&nbsp;of&nbsp;arrays; which are high-level, list-like objects.</span>    or other <a href="/en-US/docs/Web/JavaScript/Guide/iterable">iterable</a> object whose elements are key-value pairs (arrays with two elements, e.g. <code>[[ 1, 'one' ],[ 2, 'two' ]]</code>). Each key-value pair is added to the new <code>Map</code>;
    <code>null</code> values are treated as <code>undefined</code>.</dd>
</dl>

<h2>What Is Happening</h2>

<ul>
  <li><code>title</code> attribute is removed,</li>
  <li>Write that content into the page as narrative text,</li>
  <li>Hide it from screen readers using <code>aria-hidden</code>,</li>
  <li>Visually hide it using CSS clipping techniques,</li>
  <li>Associate it with the link using <code>aria-describedby</code> (allowing it to be dismissed by screen reader users),</li>
  <li>Display it as a visible positioned box using CSS when the link has focus or is hovered,</li>
  <li>Dismiss it when pressing <kbd>Esc</kbd> to satisfy <a href="https://www.w3.org/WAI/WCAG21/Understanding/content-on-hover-or-focus.html">WCAG 1.4.13 Content on Hover or Focus (AA)</a>,</li>
  <li>Added underlines to the links to satisfy <a href="https://www.w3.org/WAI/WCAG21/Understanding/use-of-color.html">WCAG 1.4.1 Use of Color (A)</a>,</li>
  <li>Full-width tool-tips at smaller viewport width,</li>
  <li><strike>Responding to page width to prevent viewport overflow</strike>,</li>
  <li>Works in Internet Explorer 11.</li>
</ul>

<h3>Known Issues</h3>

<ul>
  <li>Positioning</li>
  <li>Jumping on reveal</li>
  <li>Focus management needs help</li>
</ul>

<h3>Supports:</h3>

<ul>
  <li>Keyboard users (beyond Internet Explorer and Edge),</li>
  <li>Windows High Contrast Mode users,</li>
  <li>Print users</li>
  <li><strike>Touch users</strike></li>
</ul>
!

CSS 

              
                /* MDN styles */

body {
  line-height: 1.6;
  font-family: Verdana, arial, x-locale-body, sans-serif;
  letter-spacing: -0.00333rem;
  font-size: 15px;
  font-size: 1rem;
  color: #333;
}

:not(pre) > * > code,
:not(pre) > code {
  background-color: #bbb;
  background-color: rgba(220, 220, 220, 0.5);
  border-radius: 2px;
  box-decoration-break: clone;
  font-family: consolas, "Liberation Mono", courier, monospace;
  padding: 0 2px;
  word-wrap: break-word;
}

dt {
  font-style: normal;
  font-weight: 700;
}

a.glossaryLink:not(.new):active,
a.glossaryLink:not(.new):focus,
a.glossaryLink:not(.new):hover,
a.glossaryLink:not(.new):link,
a.glossaryLink:not(.new):visited {
  color: inherit;
  text-decoration: none;
  border-bottom: 1px dashed #aaa;
  cursor: help;
}

a,
a[name]:active,
a[name]:focus,
a[name]:hover {
  text-decoration: none;
}
a {
  text-decoration: none;
}

a:active,
a:focus,
a:hover {
  text-decoration: underline;
}

.cta-link,
a,
summary {
  color: #3f87a6;
}

h1,
h2,
h3 {
  /*     font-size: 32px;
    font-size: 2.13333rem; */
  /*     font-family: x-locale-heading-primary,zillaslab,Palatino,"Palatino Linotype",x-locale-heading-secondary,serif; */
  line-height: 1.2;
}

/* Custom for readability */

h2 {
  margin-top: 3em;
}

h3 {
  margin-top: 2.5em;
}

/* Fixing lack of underlines */

a,
a[name]:active,
a[name]:focus,
a[name]:hover {
  text-decoration: underline;
}

a.glossaryLink:not(.new):active,
a.glossaryLink:not(.new):focus,
a.glossaryLink:not(.new):hover,
a.glossaryLink:not(.new):link,
a.glossaryLink:not(.new):visited {
  border-bottom-color: #3f87a6;
}

/* Tool-tip replacement styles */

@media screen {
  a[aria-describedby] span[aria-hidden="true"] {
    position: absolute;
    top: auto;
    overflow: hidden;
    clip: rect(1px, 1px, 1px, 1px);
    width: 1px;
    height: 1px;
    white-space: nowrap;
  }
}

@media print {
  a[aria-describedby] span[aria-hidden="true"] {
    font-style: italic;
  }
}

a[aria-describedby] span[aria-hidden="true"]::before {
  content: " [";
}

a[aria-describedby] span[aria-hidden="true"]::after {
  content: "]";
}

/* Excludes IE11 */
a[aria-describedby]:focus span[aria-hidden="true"]:not([data-hide="true"]),
a[aria-describedby]:hover span[aria-hidden="true"]:not([data-hide="true"])
/* a[aria-describedby]:focus span[aria-hidden="true"],
a[aria-describedby]:hover span[aria-hidden="true"] */{
  display: block;
  z-index: 1;
  left: 0;
  clip: auto; /* IE11 does not support unset */
  width: auto;
  height: auto;
  padding: 0.5em 0.75em;
  border: 0.05em solid rgba(255, 255, 255, 1);
  border-radius: 0.2em;
  box-shadow: 0.15em 0.15em 0.5em rgba(0, 0, 0, 1);
  background-color: rgba(0, 0, 0, 0.85);
  color: rgba(255, 255, 255, 1);
  font-size: 80%;
  animation: TOOLTIP 0.1s ease-out 1;
  overflow: visible; /* IE11 does not support unset */
  white-space: normal; /* IE11 does not support unset */
  margin-top: 1.5em;
}

a[aria-describedby]:focus span[aria-hidden="true"]:not([data-hide="true"]),
a[aria-describedby]:hover span[aria-hidden="true"]:not([data-hide="true"]) {
  display: block;
  z-index: 1;
  left: 0;
  clip: auto; /* IE11 does not support unset */
  width: auto;
  height: auto;
  padding: 0.5em 0.75em;
  border: 0.05em solid rgba(255, 255, 255, 1);
  border-radius: 0.2em;
  box-shadow: 0.15em 0.15em 0.5em rgba(0, 0, 0, 1);
  background-color: rgba(0, 0, 0, 0.85);
  color: rgba(255, 255, 255, 1);
  font-size: 80%;
  animation: TOOLTIP 0.1s ease-out 1;
  overflow: visible; /* IE11 does not support unset */
  white-space: normal; /* IE11 does not support unset */
  margin-top: 1.5em;
}

a[aria-describedby]:focus span[aria-hidden="true"]::before,
a[aria-describedby]:hover span[aria-hidden="true"]::before,
a[aria-describedby]:focus span[aria-hidden="true"]::after,
a[aria-describedby]:hover span[aria-hidden="true"]::after {
  content: "";
}

@media screen and (min-width: 30em) {
  a[aria-describedby] {
    position: relative;
  }
  a[aria-describedby]:focus span[aria-hidden="true"],
  a[aria-describedby]:hover span[aria-hidden="true"] {
    max-width: 100vw;
    bottom: 1.5em;
    animation: TOOLTIP 0.1s ease-out 1;
    margin-top: unset;
  }
}

/* The animation */

@keyframes TOOLTIP {
  from {
    bottom: 0.5em;
    background-color: rgba(0, 0, 0, 0);
    border: 0.05em solid rgba(255, 255, 255, 0);
    color: rgba(255, 255, 255, 0);
    box-shadow: 0 0 0 rgba(0, 0, 0, 1);
  }
  to {
    bottom: 1.5em;
    background-color: rgba(0, 0, 0, 0.85);
    border: 0.05em solid rgba(255, 255, 255, 1);
    color: rgba(255, 255, 255, 1);
    box-shadow: 0.15em 0.15em 0.5em rgba(0, 0, 0, 1);
  }
}

/* Show it on paper */

/* @media print {
  span[role=img][aria-label]::after {
    content: " (" attr(aria-label) ") ";
  } */

/* Button approach styles */

.tip-button {
  /*   position: relative; */
  border: 0.1em solid #3f87a6;
  color: #3f87a6;
  background-color: transparent;
  font-family: inherit;
  font-size: 65%;
  border-radius: 50%;
  line-height: 1;
  text-align: center;
  padding: 0.2em 0;
  margin: 0;
  width: 1.5em;
  vertical-align: super;
}

.tip-button:hover,
.tip-button:focus {
  color: #fff;
  background-color: #3f87a6;
  outline: none;
}

.tip-button span:last-child {
  position: absolute;
  top: auto;
  overflow: hidden;
  clip: rect(1px, 1px, 1px, 1px);
  width: 1px;
  height: 1px;
  white-space: nowrap;
}

.tip-button + span {
  display: block;
  position: absolute;
  z-index: 1;
  left: 0;
  width: auto;
  height: auto;
  padding: 0.5em 0.75em;
  border: 0.05em solid rgba(255, 255, 255, 1);
  border-radius: 0.2em;
  box-shadow: 0.15em 0.15em 0.5em rgba(0, 0, 0, 1);
  background-color: rgba(0, 0, 0, 0.85);
  color: rgba(255, 255, 255, 1);
  font-size: 80%;
  animation: TOOLTIP 0.1s ease-out 1;
  margin-top: 1.5em;
}

@media screen and (min-width: 30em) {
  .tip-button {
    /*     position: relative; */
  }
  .tip-button + span,
  .tip-button + span {
    max-width: 100vw;
    /*     bottom: 1.5em; */
    animation: TOOLTIP 0.1s ease-out 1;
    margin-top: unset;
  }
}

@media screen and (-ms-high-contrast: active) {
  .tip-button:hover,
  .tip-button:focus {
    outline: windowText dotted 0.1em;
  }
}
!

JS 

              
                // Ref for later
// https://a11y.nicolas-hoffmann.net/simple-tooltip/


function ClearToolTips() {
  // Get all the fake tool-tips
  var allTips = document.querySelectorAll(
    "a[aria-describedby]:focus span[aria-hidden='true'], a[aria-describedby]:hover span[aria-hidden='true']"
  );
  // Loop through all fake tool-tips and add an attribute
  for (var i = 0; i < allTips.length; i++) {
    allTips[i].setAttribute("data-hide", "true");
  }
}

function toggleToolTips(btnID) {
  try {
    // Get all the tool-tip buttons
    var allButtons = document.querySelectorAll(".tip-button");
    // Get all tool-tips
    var allToolTips = document.querySelectorAll(".tip-button + span");
    // Get all the button text
    var allButtonsToggleText = document.querySelectorAll(".tip-button span:first-child");
    var allButtonsInfoText = document.querySelectorAll(".tip-button span:last-child");
    if (btnID !== "") {
      // Get the button
      var toggle = document.querySelector("#" + btnID);
      // Find out what the button controls
      var toolTipIdent = toggle.getAttribute("aria-controls");
      // Get that thing it controls
      var toolTip = document.getElementById(toolTipIdent);
      // 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].querySelector("span:first-child").innerHTML = "?";
          allButtons[i].querySelector("span:last-child").innerHTML =
            "More about";
        }
        // Now mark the chosen button as opened
        toggle.setAttribute("aria-expanded", "true");
        toggle.querySelector("span:first-child").innerHTML = "×";
        toggle.querySelector("span:last-child").innerHTML = "Close";
      } else {
        // Close chosen button; no need to loop through rest of nodes
        toggle.setAttribute("aria-expanded", "false");
        toggle.querySelector("span:first-child").innerHTML = "?";
        toggle.querySelector("span:last-child").innerHTML = "More about";
        toggle.focus();
      }
      // Expand or collapse
      if (toolTip.style.display === "none") {
        // Hide all submenus
        for (var i = 0; i < allToolTips.length; i++) {
          allToolTips[i].style.display = "none";
        }
        // Show chosen tool-tip
        toolTip.style.display = "block";
        toolTip.focus();
      } else {
        // Close chosen tool-tip; no need to loop through rest of nodes
        toolTip.style.display = "none";
      }
    }
    if (btnID !== "") {
    } else {
      // Hide all tool-tips
      for (var i = 0; i < allToolTips.length; i++) {
        allToolTips[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].querySelector("span:first-child").innerHTML = "?";
        allButtons[i].querySelector("span:last-child").innerHTML = "More about";
      }
    }
  } catch (e) {
    console.log("toggleToolTips(): " + 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");
    ClearToolTips();
    toggleToolTips("");
  }
};
!
999px

Console