modernizr/feature-detects/elem/details.js

Modernizr is a JavaScript library that detects HTML5 and CSS3 features in the user’s browser.

/*!
{
  "name": "details Element",
  "caniuse": "details",
  "property": "details",
  "tags": ["elem"],
  "builderAliases": ["elem_details"],
  "authors": ["@mathias"],
  "notes": [{
    "name": "Mathias' Original",
    "href": "https://mathiasbynens.be/notes/html5-details-jquery#comment-35"
  }]
}
!*/
define(['Modernizr', 'createElement', 'docElement', 'testStyles'], function(Modernizr, createElement, docElement, testStyles) {
  Modernizr.addTest('details', function() {
    var el = createElement('details');
    var diff;

    // return early if possible; thanks @aFarkas!
    if (!('open' in el)) {
      return false;
    }

    testStyles('#modernizr details{display:block}', function(node) {
      node.appendChild(el);
      el.innerHTML = '<summary>a</summary>b';
      diff = el.offsetHeight;
      el.open = true;
      diff = diff != el.offsetHeight;
    });


    return diff;
  });
});