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              <a href="#" class="button js-button" role="button">Show content</a>

<div class="content">
  <p>This demonstrates how to markup an <code>&lt;anchor&gt;</code> element as if it were a <code>&lt;button&gt;</code> element.</p>
  <p>Key takeaway is to add <code>role="button"</code> and handle the 'space' key as native buttons will excecute JS events on 'space' keypress by default.</p>
</div>
            
          
!
            
              body {
  padding: 2em;
}

.button {
  background-color: ForestGreen;  
  border-radius: 5px;
  color: white;
  padding: .5em;
  text-decoration: none;
}

.button:focus,
.button:hover {
  background-color: DarkGreen;
}

.content {
  display: none;
  margin: 1em 0;
}

.content.active,
.no-js .content {
  display: block;
}
            
          
!
            
              (function (document, window, undefined) {
  'use strict';
  
  // Buttons
  var buttons = document.querySelectorAll('.js-button');   
  
  var displayContent = function (button, content) {
    if (content.classList.contains('active')) {
        // Hide content
        content.classList.remove('active');
        button.setAttribute('aria-expanded', 'false');
        content.setAttribute('aria-hidden', 'true');
      } else {
        // Show content
        content.classList.add('active');
        button.setAttribute('aria-expanded', 'true');
        content.setAttribute('aria-hidden', 'false');
      }
  };
  
  [].forEach.call(buttons, function(button, index) {
    // Content var
    var content = button.nextElementSibling;
    
    // Set button attributes
    button.setAttribute('id', 'button-' + index);
    button.setAttribute('aria-expanded', 'false');
    button.setAttribute('aria-controls', 'content-' + index);
    
    // Set content attributes
    content.setAttribute('id', 'content-' + index);
    content.setAttribute('aria-hidden', 'true');    
    content.setAttribute('aria-labelledby', 'button-' + index);
  
    button.addEventListener('click', function () {
      displayContent(this, content);
      return false;
    }, false);
    
    button.addEventListener('keydown', function (event) {
      // Handle 'space' key
      if (event.which === 32) {
        event.preventDefault();
        displayContent(this, content);
      }
    }, false);
    
  });  
  
})(document, window);
            
          
!
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