OPTION 1 - embed on page var humanitix = { realOffsetTop: (el) => { var combinedTop = 0; if (el.offsetParent) { do combinedTop += el.offsetTop; while ((el = el.offsetParent)); return ; } }, updateTopBottomAnchors: () => { let scrollY = window.scrollY; let childFrame = document.getElementById("iframe-container"); let iframeY = humanitix.realOffsetTop(childFrame); let iframeH = childFrame.offsetHeight; let topAnchor ... [Read more...]