MediaWiki:Common.js
From WikiMSK
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/* Any JavaScript here will be loaded for all users on every page load. */
$(document).ready(function() {
// Get all the <h2> headings
const headings = document.querySelectorAll('.mw-parser-output h2');
for (i = 0; i < headings.length; i++) {
headings[i].innerHTML = '<button aria-expanded="false">' + headings[i].innerHTML + '<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>';
}
});