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Data retention summary

function waitForElement(selector) { return new Promise(resolve => { if (document.querySelector(selector)) { return resolve(document.querySelector(selector)); } const observer = new MutationObserver(mutations => { if (document.querySelector(selector)) { resolve(document.querySelector(selector)); observer.disconnect(); } }); observer.observe(document.body, { childList: true, subtree: true }); }); } function insertBefore(newNode, existingNode) { existingNode.parentNode.insertBefore(newNode, existingNode); } function insertAfter(newNode, existingNode) { existingNode.parentNode.insertBefore(newNode, existingNode.nextSibling); } document.addEventListener("DOMContentLoaded", function() { waitForElement('.courseindex-link').then((e) => { /* grab the links from the sidebar */ var links = Array.from(document.querySelectorAll('a.courseindex-link')); var currentPosition = links.findIndex(l => l.href.includes(window.location.href)); var previousURL = links[currentPosition - 1].href; var nextURL = links[currentPosition + 1].href; var completionInfoDiv = document.querySelector('.completion-info') var completeButton = completionInfoDiv.querySelector('button'); var nextButton = document.createElement('a') nextButton.href = nextURL; nextButton.className = 'btn btn-primary'; nextButton.role = 'button'; nextButton.innerText = 'Next section'; insertAfter(nextButton, completeButton); var previousButton = document.createElement('a') previousButton.href = previousURL; previousButton.className = 'btn btn-secondary'; previousButton.role = 'button'; previousButton.innerText = 'Back'; insertBefore(previousButton, completeButton); }); });

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