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(() => {
const uri = new URL(location.href);
document.querySelector('header nav h2').addEventListener('click', function () {
this.parentNode.querySelector('ul').classList.toggle('show');
}, false);
document.querySelectorAll("main h2[id]").forEach((header) => {
uri.hash = header.id;
let link = document.createElement("a");
link.className = "header-permalink";
link.title = "Permalink";
link.href = uri.toString();
link.innerHTML = "¶";
header.appendChild(link);
});
})();
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