MediaWiki:Common.js

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/* Any JavaScript here will be loaded for all users on every page load. */

function docReady(fn) {
    // see if DOM is already available
    if (document.readyState === "complete" || document.readyState === "interactive") {
        // call on next available tick
        setTimeout(fn, 1);
    } else {
        document.addEventListener("DOMContentLoaded", fn);
    }
}    

$('document').ready(function() {
  // Get all the <h2> headings
  const headings = document.querySelectorAll('.mw-parser-output h2')
  
  
  
  Array.prototype.forEach.call(headings, heading => {
    // Give each <h2> a toggle button child
    // with the SVG plus/minus icon
    heading.innerHTML = `
      <button aria-expanded="false">
        ${heading.textContent}
        <svg aria-hidden="true" focusable="false" viewBox="0 0 10 10">
          <rect class="vert" height="8" width="2" y="1" x="4"/>
          <rect height="2" width="8" y="4" x="1"/>
        </svg>
      </button>
    `
  })
})()