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                Partial page updates are made possible by the hashchange event listener, which fires when a link is clicked and the url changes. In this case the url is a hash which references an anchor on the page. Page data is stored in html and as the new page cycles, the previous page is stored

<div id="active-page" class="active-page">
    <section id="page1">
        <img src="">
        <img src="">
        <img src="">
        <a href="#page2">Page 2</a>

<div id="data-container">

    <section id="page2">
        <p>Lorum Ipsum Shmipsum</p>
        <a href="#page3">Page 3</a>

    <section id="page3">
        <p>Shmipsin Lipson Dipsom</p>
        <a href="#page1">Page 1</a>







                var activePage = document.getElementById("active-page");
var dataContainer = document.getElementById("data-container");

window.addEventListener("hashchange",function(event){//fires when link is clicked
    if (event.newURL){//returns clicked link URL
        var sectionID = event.newURL.split('#')[1];//isolates string after #
        var newPage = document.getElementById(sectionID);//section ID  format matches link format
       var temp =  activePage.removeChild(activePage.children[0]);//removes active page and stores result
       dataContainer.appendChild(temp);//stores temp in data container