MediaWiki:Common.js

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function testHook() {
    let elements = document.getElementsByClassName("vector-toc-list-item-expanded");
    for (let i = 0; i < elements.length; i++) {
        console.log(elements[i].classList.remove("vector-toc-list-item-expanded"));
    }
debugger;
};

mw.hook( 'mw-panel-toc.ready' ).fire(testHook());