Move abroad without worries

(function() { 'use strict'; const VIEWPORT_TOP_THRESHOLD = 0.2; const VIEWPORT_BOTTOM_THRESHOLD = 0.8; function updateProgressTrackers() { const trackers = document.querySelectorAll('.progress-tracker-single'); const viewportHeight = window.innerHeight; const topThreshold = viewportHeight * VIEWPORT_TOP_THRESHOLD; const bottomThreshold = viewportHeight * VIEWPORT_BOTTOM_THRESHOLD; const trackerArray = Array.from(trackers).sort((a, b) => { return parseInt(a.getAttribute('data-index')) - parseInt(b.getAttribute('data-index')); }); trackerArray.forEach((tracker, index) => { const targetClass = tracker.getAttribute('data-target'); const targetElement = document.querySelector('.' + targetClass); if (!targetElement) return; const rect = targetElement.getBoundingClientRect(); const progressFill = tracker.querySelector('.progress-bar-fill'); const topLabel = tracker.querySelector('.progress-label.top'); const bottomLabel = tracker.querySelector('.progress-label.bottom'); let currentProgress = 0; const elementTop = rect.top; if (elementTop = bottomThreshold) { currentProgress = 0; } else { const totalDistance = bottomThreshold - topThreshold; const currentDistance = elementTop - topThreshold; currentProgress = 100 - ((currentDistance / totalDistance) * 100); currentProgress = Math.max(0, Math.min(100, currentProgress)); } if (currentProgress === 100) { tracker.classList.remove('active'); tracker.classList.add('completed'); topLabel.classList.add('active-yellow'); bottomLabel.classList.add('active-yellow'); if (index 0) { tracker.classList.add('active'); tracker.classList.remove('completed'); topLabel.classList.add('active-yellow'); bottomLabel.classList.remove('active-yellow'); if (index = bottomThreshold) { nextTopLabel.classList.remove('active-yellow'); } } } else { tracker.classList.remove('active'); tracker.classList.remove('completed'); topLabel.classList.remove('active-yellow'); bottomLabel.classList.remove('active-yellow'); } progressFill.style.height = currentProgress + '%'; }); } let ticking = false; function requestTick() { if (!ticking) { window.requestAnimationFrame(function() { updateProgressTrackers(); ticking = false; }); ticking = true; } } window.addEventListener('scroll', requestTick, { passive: true }); window.addEventListener('resize', requestTick, { passive: true }); updateProgressTrackers(); if (window.MutationObserver) { const observer = new MutationObserver(requestTick); observer.observe(document.body, { childList: true, subtree: true }); } })();