Why does Bootstrap 4 card images use data-src and not src for image tags? -

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in demo code below uses data-src no img src. how image applied? javascript modify somehow?

http://v4-alpha.getbootstrap.com/components/card/

 <div class="card">       <img class="card-img-top" data-src="..." alt="card image cap">       <div class="card-block">         <h4 class="card-title">card title</h4>         <p class="card-text">some quick example text build on card title , make bulk of card's content.</p>         <a href="#" class="btn btn-primary">button</a>       </div>     </div>

bootstrap 4 documentation uses holder.js, see http://imsky.github.io/holder/

also see: https://github.com/imsky/holder#usage

include holder.js in html:

holder process images specific src attribute, one:

the above tag render placeholder 300 pixels wide , 200 pixels tall.

to avoid console 404 errors, can use data-src instead of src.

holder included via http://v4-alpha.getbootstrap.com/assets/js/docs.min.js


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