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const expandBtn = document.getElementById('expandNavbarBtn');
const sidebarElem = document.getElementById('sidebar');
if (localStorage.getItem('navbar') === 'hidden' || window.innerWidth <= 610) {
expandBtn.innerHTML = '▼';
sidebarElem.classList.add('sidebar-hidden');
}
expandBtn.onclick = function() {
sidebarElem.classList.toggle('sidebar-hidden');
if (!sidebarElem.classList.contains('sidebar-hidden')) {
expandBtn.innerHTML = '▲'; // triangle pointing up
if (window.innerWidth > 610) localStorage.setItem('navbar', 'norm');
}
else {
expandBtn.innerHTML = '▼'; // triangle pointing down
if (window.innerWidth > 610) localStorage.setItem('navbar', 'hidden');
}
}
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