MediaWiki:Common.js
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$(function () {
const $button = $('<div id="back-to-top">Back to Top ↑</div>');
$('body').append($button);
$button.on('click', function () {
$('html, body').animate({ scrollTop: 0 }, 500);
});
$(window).on('scroll', function () {
if ($(this).scrollTop() > 300) {
$button.fadeIn();
} else {
$button.fadeOut();
}
});
});