HTMLElement.accessKeyLabel
  The HTMLElement.accessKeyLabel
  read-only property returns a String containing the element's
  browser-assigned access key (if any); otherwise it returns an empty string.
Syntax
label = element.accessKeyLabel
Example
JavaScript
var btn = document.getElementById('btn1');
var shortcutLabel = btn.accessKeyLabel || btn.accessKey;
btn.title += ' [' + shortcutLabel.toUpperCase() + ']';
btn.onclick = function () {
  var feedback = document.createElement('output');
  feedback.textContent = 'Pressed!';
  btn.insertAdjacentElement('afterend', feedback);
};
HTML
<button accesskey="h" title="Caption" id="btn1">Hover me</button>
Result
Specifications
| Specification | 
|---|
| HTML Standard  # dom-accesskeylabel  | 
Browser compatibility
BCD tables only load in the browser
See also
HTMLElement.accessKey- The accesskey global attribute.