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Load images only when they are in (and remain in) the viewport — in only about 350 bytes of javascript. <img class="lazyestload" src="images/placeholder/sunset.jpg" data-src="images/sunset.jpg" > <script src="js/lazyestload.min.js"></script> </body>

https://en.wikipedia.org/wiki/Usage_share_of_web_browsers

Load your code to its potential with great and open source tools. https://w3c.github.io/developers/tools/#tools

CodePen  is a social development environment for front-end designers and developers.. It's the best place to build and deploy a website, show off your work. http://codepen.io