User:Gabrielbjb/citizen.js

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// For the category
mw.loader.using(['mediawiki.util']).then(function () {

const categorynya = document.querySelector("#mw-normal-catlinks ul");
const kontainernya = document.querySelector("#mw-normal-catlinks");
if (categorynya && kontainernya) {
    const togglekan = document.createElement("button");
    togglekan.textContent = "Collapse";
    togglekan.style.marginLeft = "8px";
    togglekan.style.cursor = "pointer";
    let IsGone = false;
    togglekan.onclick = function () {

        IsGone = !IsGone;

        if (IsGone) {
            categorynya.style.display = "none";
            togglekan.textContent = "Uncollapse";
        } else {
            categorynya.style.display = "";
            togglekan.textContent = "Collapse";
        }
    };
    kontainernya.insertBefore(togglekan, kontainernya.children[1]);
}

});