"progressive image"
Bootstrap 3.0.0 Snippet by evarevirus

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<link href="//netdna.bootstrapcdn.com/bootstrap/3.0.0/css/bootstrap.min.css" rel="stylesheet" id="bootstrap-css"> <script src="//netdna.bootstrapcdn.com/bootstrap/3.0.0/js/bootstrap.min.js"></script> <script src="//code.jquery.com/jquery-1.11.1.min.js"></script> <!------ Include the above in your HEAD tag ----------> <!DOCTYPE html><html lang='en' class=''> <head><script src='//production-assets.codepen.io/assets/editor/live/console_runner-079c09a0e3b9ff743e39ee2d5637b9216b3545af0de366d4b9aad9dc87e26bfd.js'></script><script src='//production-assets.codepen.io/assets/editor/live/events_runner-73716630c22bbc8cff4bd0f07b135f00a0bdc5d14629260c3ec49e5606f98fdd.js'></script><script src='//production-assets.codepen.io/assets/editor/live/css_live_reload_init-2c0dc5167d60a5af3ee189d570b1835129687ea2a61bee3513dee3a50c115a77.js'></script><meta charset='UTF-8'><meta name="robots" content="noindex"><link rel="shortcut icon" type="image/x-icon" href="//production-assets.codepen.io/assets/favicon/favicon-8ea04875e70c4b0bb41da869e81236e54394d63638a1ef12fa558a4a835f1164.ico" /><link rel="mask-icon" type="" href="//production-assets.codepen.io/assets/favicon/logo-pin-f2d2b6d2c61838f7e76325261b7195c27224080bc099486ddd6dccb469b8e8e6.svg" color="#111" /><link rel="canonical" href="https://codepen.io/straybugs/pen/gLJyXW" /> <link rel='stylesheet prefetch' href='https://cdnjs.cloudflare.com/ajax/libs/meyer-reset/2.0/reset.min.css'> <style class="cp-pen-styles">.container { position: relative; background: 54.67% 52.93%/cover url('https://blog.crimx.com/images/post/cover/volcano-1807514_1920.jpg'); } .thumbnail { position: absolute; z-index: 10; top: 0; right: 0; bottom: 0; left: 0; background: 54.67% 52.93%/cover url('data:image/jpeg;base64,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'); -webkit-transition: opacity .4s .6s; transition: opacity .4s .6s; } .container:before { position: absolute; z-index: 20; top: 0; right: 0; bottom: 0; left: 0; background-color: rgba(0,0,0,.4); } .content { position: relative; z-index: 30; padding: 100px 20px; font-size: 4em; text-align: center; color: #fff; } .thumbnail--hide { opacity: 0; }</style></head><body> <div class="container"> <div class="thumbnail"></div> <h1 class="content"> Progressive Background Image! </h1> </div> <script src='//production-assets.codepen.io/assets/common/stopExecutionOnTimeout-b2a7b3fe212eaa732349046d8416e00a9dec26eb7fd347590fbced3ab38af52e.js'></script><script src='https://cdnjs.cloudflare.com/ajax/libs/zepto/1.2.0/zepto.min.js'></script> <script >var $container = $('.container') // Matchs the "url(...)" var bigBgSrc = $container.css('background-image').match(/url\((.+?)\)/i) if (bigBgSrc) { // Removes quotations bigBgSrc = bigBgSrc[1].replace(/'|"/g, '') $('<img>') .on('load', function () { $container.find('.thumbnail') .addClass('thumbnail--hide') // Hides thumbnail }) .prop('src', bigBgSrc) } //# sourceURL=pen.js </script> </body></html>

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