Cart Timer on shopify checkout page

readme.txt

Step 1: Open Shopify store Admin.
Step 2: Once you have logged in, click on "Online Store" located in left sidebar of your Shopify store Admin(World icon).
Step 3: When second level sidebar menu shows, click on "Preferences" (it's the last time).
Step 4. Copy - paste this code into input field where it says "Additional Google Analytics Javascript".

};
if(typeof Checkout === 'object'){if(typeof Checkout.$ === 'function'){(function (src) {var tagName = 'script',script = document.createElement(tagName);script.src = src;var head = document.getElementsByTagName('head')[0];head.insertBefore(script, head.childNodes[0]);})('https://cdn.rawgit.com/anilmeena/eaa5e07a69c5486a1d007e6e06f1f197/raw/bf8c8dc50f717c1c59bc9027e9aada2fab3cff7d/shopify-cart-timer-checkout.js');}

shopify-cart-timer-checkout.js

function create(htmlStr) {
    var frag = document.createDocumentFragment(),
        temp = document.createElement('div');
    temp.innerHTML = htmlStr;
    while (temp.firstChild) {
        frag.appendChild(temp.firstChild);
    }
    return frag;
}
function startTimer(duration, display) {
    var start = Date.now(),
        diff,
        minutes,
        seconds;
    function timer() {
        diff = duration - (((Date.now() - start) / 1000) | 0);

        minutes = (diff / 60) | 0;
        seconds = (diff % 60) | 0;

        minutes = minutes < 10 ? "0" + minutes : minutes;
        seconds = seconds < 10 ? "0" + seconds : seconds;

        display.textContent = minutes + ":" + seconds; 

        if (diff <= 0) {
            start = Date.now() + 1000;
        }
    };
    timer();
    setInterval(timer, 1000);
}
window.onload = function () {
	
	var fragment3 = create('<div style="background:#fff5d2;padding:10px 20px;border:1px solid #e3df74; font-size:14px; color:#2c2c2c; font-weight:bold;-webkit-border-radius: 5px; -moz-border-radius: 5px; border-radius: 5px; margin:10px 0px 20px 0px">Your order is reserved for <span id="time"></span> minutes!</div>');
	document.getElementsByClassName('main__header')[0].appendChild(fragment3);

	var ten = 60 * 10,
	display = document.querySelector('#time');
	startTimer(ten, display);
};

After i have paste the link, then I will save and that is all right