https://prenatalgenomicsgroup.org.uk/scripts/plugins/rellax.min.js

1(function (g, d) { "function" === typeof define && define.amd ? define([], d) : "object" === typeof module && module.exports ? module.exports = d() : g.Rellax = d() })(this, function () { var g = function (d, l) { var b = Object.create(g.prototype), h = 0, p = 0, k = 0, q = 0, f = [], t = !1, y = window.requestAnimationFrame || window.webkitRequestAnimationFrame || window.mozRequestAnimationFrame || window.msRequestAnimationFrame || window.oRequestAnimationFrame || function (a) { setTimeout(a, 1E3 / 60) }, z = window.transformProp || function () { var a = document.createElement("div"); if (null === a.style.transform) { var c = ["Webkit", "Moz", "ms"], b; for (b in c) if (void 0 !== a.style[c[b] + "Transform"]) return c[b] + "Transform" } return "transform" }(), r = function (a, b, e) { return a <= b ? b : a >= e ? e : a }; b.options = { speed: -2, center: !1, round: !0, vertical: !0, horizontal: !1, callback: function () { } }; l && Object.keys(l).forEach(function (a) { b.options[a] = l[a] }); b.options.speed = r(b.options.speed, -10, 10); d || (d = ".rellax"); var u = "string" === typeof d ? document.querySelectorAll(d) : [d]; if (0 < u.length) b.elems = u; else throw Error("The elements you're trying to select don't exist."); var A = function (a) { var c = a.getAttribute("data-rellax-percentage"), e = a.getAttribute("data-rellax-speed"), f = a.getAttribute("data-rellax-zindex") || 0, d = b.options.vertical ? c || b.options.center ? window.pageYOffset || document.documentElement.scrollTop || document.body.scrollTop : 0 : 0, m = b.options.horizontal ? c || b.options.center ? window.pageXOffset || document.documentElement.scrollLeft || document.body.scrollLeft : 0 : 0, g = d + a.getBoundingClientRect().top, h = a.clientHeight || a.offsetHeight || a.scrollHeight, k = m + a.getBoundingClientRect().left, l = a.clientWidth || a.offsetWidth || a.scrollWidth; d = c ? c : (d - g + p) / (h + p); var n = c ? c : (m - k + q) / (l + q); b.options.center && (d = n = .5); m = e ? r(e, -10, 10) : b.options.speed; if (c || b.options.center) m = r(e || b.options.speed, -5, 5); c = v(n, d, m); a = a.style.cssText; e = ""; 0 <= a.indexOf("transform") && (e = a.indexOf("transform"), e = a.slice(e), e = (d = e.indexOf(";")) ? " " + e.slice(11, d).replace(/\s/g, "") : " " + e.slice(11).replace(/\s/g, "")); return { baseX: c.x, baseY: c.y, top: g, left: k, height: h, width: l, speed: m, style: a, transform: e, zindex: f } }, w = function () { var a = h, c = k; h = void 0 !== window.pageYOffset ? window.pageYOffset : (document.documentElement || document.body.parentNode || document.body).scrollTop; k = void 0 !== window.pageXOffset ? window.pageXOffset : (document.documentElement || document.body.parentNode || document.body).scrollLeft; return a != h && b.options.vertical || c != k && b.options.horizontal ? !0 : !1 }, v = function (a, c, e) { var d = {}; a = 100 * e * (1 - a); c = 100 * e * (1 - c); d.x = b.options.round ? Math.round(a) : Math.round(100 * a) / 100; d.y = b.options.round ? Math.round(c) : Math.round(100 * c) / 100; return d }, x = function () { w() && !1 === t && n(); y(x) }, n = function () { for (var a = 0; a < b.elems.length; a++) { var c = v((k - f[a].left + q) / (f[a].width + q), (h - f[a].top + p) / (f[a].height + p), f[a].speed), d = c.y - f[a].baseY, g = c.x - f[a].baseX; b.elems[a].style[z] = "translate3d(" + (b.options.horizontal ? g : "0") + "px," + (b.options.vertical ? d : "0") + "px," + f[a].zindex + "px) " + f[a].transform } b.options.callback(c) }; b.destroy = function () { for (var a = 0; a < b.elems.length; a++) b.elems[a].style.cssText = f[a].style; t = !0 }; (function () { p = window.innerHeight; q = window.innerWidth; w(); for (var a = 0; a < b.elems.length; a++) { var c = A(b.elems[a]); f.push(c) } window.addEventListener("resize", function () { n() }); x(); n() })(); return b }; return g });