Beginning of the documentation

doc/_book/book_assets/anchor-sections-1.1.0/anchor-sections.js

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+document.addEventListener('DOMContentLoaded', function () {
+  // If section divs is used, we need to put the anchor in the child header
+  const headers = document.querySelectorAll("div.hasAnchor.section[class*='level'] > :first-child")
+
+  headers.forEach(function (x) {
+    // Add to the header node
+    if (!x.classList.contains('hasAnchor')) x.classList.add('hasAnchor')
+    // Remove from the section or div created by Pandoc
+    x.parentElement.classList.remove('hasAnchor')
+  })
+})