MediaWiki:Common.js

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/* Any JavaScript here will be loaded for all users on every page load. */
$( function () {
	var elems = document.getElementsByClassName('mw-editsection'); // *** NOTE: ClassName may need to be 'mw-editsection' instead
	for (i = 0; i < elems.length; i++) {
		var span = document.createElement('span');
		var link = document.createElement('a');
		link.href = '#top';
		link.appendChild(document.createTextNode('Back to Top'));
		span.appendChild(link);
		elems[i].insertBefore(span, elems[i].lastChild.nextSibling);
	}
});