I am working with localStorage. My code is perfectly working in Chrome, but not in IE9 and Firefox.

Here is the code:

document.addEventListener("DOMContentLoaded", restoreContents, false);
document.getElementsByTagName("body")[0].onclick=function(){saveContents('myList','contentMain', event, this);};

function amIclicked(e, eleObject)
{
    alert("amIClicked");
    e = e || event;
    var target = e.target || e.srcElement;
    alert("target = " + target.id);
    if(target.id=='pageBody' || target.id=='Save')
        return true;
    else
        return false;
}

function saveContents(e, d, eveObj, eleObject) {
    //alert("saveContents");
    if (amIclicked(eveObj, eleObject)) {
        var cacheValue = document.getElementById(e).innerHTML;
        var cacheKey = "key_" + selectedKey;
        var storage = window.localStorage;
        //alert ("cacheKey = " + cacheKey + " ,cacheValue = " + cacheValue); 
        if(typeof(Storage)!=="undifined"){
        localStorage.setItem("cacheKey","cacheValue");
        }
        //alert ("Saved!!"); 
        var dd = document.getElementById(d);
        //document.getElementById("contentMain").style.display == "none";       
        dd.style.display = "none";
    }
}

function restoreContents(e,k) {
    //alert("test");
    if(k.length < 1) { return; }
    var mySavedList = localStorage["key_" + k];

    if (mySavedList != undefined) {
        document.getElementById(e).innerHTML = mySavedList;
    }
}


    <a onclick="ShowContent('contentMain','myList','Sample_1'); return true;" href="#" >Sample 1</a><br/><br/>
    <a onclick="ShowContent('contentMain','myList','Sample_2'); return true;" href="#" >Sample 2</a><br/><br/>

    <div style="display:none;display:none;position:absolute;border-style: solid;background-color: white;padding: 5px;"id="contentMain">
    <ol id="myList" contenteditable="true">
        <li>Enter Content here</li>
    </ol>
<!--<input id="editToggleButton" type="button" value="Edit"/>-->
</div>

When I debugging in Iexplore Iam getting the error as

SCRIPT5007: Unable to get value of the property 'length': object is null or undefined sample_1.html, line 157 character 3

Thanks