Defer Offscreen Images | How to improve website speed ?

First create simple Gallery images wesite in HTML and check Google speed testing

1) Download the lazysizes Javascript library . Once download ,include it in your page through following script tag :

     <script src="lazysizes.min.js" async=""></script>

2) within your HTML <img> tag:

    <img data-src="image.jpg" class="lazyload"/>

php web development company | website design and development