GNI - Scroll Depth Tracking for Publishers

window.dataLayer = window.dataLayer || [];
window.dataLayer.push({
    'event' : 'article-milestone',
    'article_title': '<article title>',
    'scroll_measure_percent': '<25%|50%|75%|100%>',
    'scroll_measure_value': <25|50|75|100>
});