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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>ally.style.focusWithin Example</title>
</head>
<body>
​
<article id="example-introduction">
  <h1><code>ally.style.focusWithin</code> Example</h1>
​
  <p>The ancestry of the focused element should be visible by red borders. The first and the last input are outside of the style scope - they are there to provide focusable elements to verify that the <code>ally-focus-within</code> class is properly removed.</p>
</article>
​
<div id="example-html">
  <main>
    <input id="before-input" type="text" value="before styled">
    <div class="example">
      <div id="first-shadow-host"></div>
      <div>
        <input id="outer-input" type="text" value="outer input">
      </div>
      <svg width="50" height="50" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
        <a xlink:href="#void" data-label="svg a[xlink|href]">
          <text x="10" y="20" data-label="svg a[xlink|href] text">an SVG</text>
        </a>
      </svg>
    </div>
  </main>
</div>
​
<script src="https://cdn.jsdelivr.net/ally.js/1.4.1/ally.min.js"></script>
</body>
</html>
​
 
​
/* separate blocks because ">>>" or "/deep/" might not be supported and thus render the selector void */
.example.ally-focus-within,
.example .ally-focus-within {
  margin: 2px;
  border: 2px solid red;
}
.example >>> .ally-focus-within {
  margin: 2px;
  border: 2px solid red;
}
.example /deep/ .ally-focus-within {
  margin: 2px;
  border: 2px solid red;
}
svg .ally-focus-within {
  outline: 2px red solid;
}
 
​
var handle = ally.style.focusWithin();
var input = document.getElementById('before-input');
​
// create shadow dom structure:
if (document.body.createShadowRoot !== undefined) {
  var shadowed = createShadowedContent(
    document.getElementById('first-shadow-host'),
    '<div id="second-shadow-host"></div><div id="third-shadow-host"></div>'
  );
  var second = createShadowedContent(
    shadowed.getElementById('second-shadow-host'),
    '<input id="first-input" type="text" value="::shadow ::shadow input">'
  );
  createShadowedContent(
    shadowed.getElementById('third-shadow-host'),
    '<input id="second-input" type="text" value="::shadow ::shadow input">'
  );
​
  input = second.querySelector('input');
}
​
input.focus();
​
function createShadowedContent(host, html) {
  var root = host.createShadowRoot();
  root.innerHTML = html;
  return root;
}
​
Output 300px

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