-webkit-mask-image: -webkit-linear-gradient(top, rgba(0,0,0,1), rgba(0,0,0,0));
css
http://thenittygritty.co/css-masking
<iframe width="100%" height="200" src="http://snipet.teknotit.com/index.php?embed=55fd737fafcec" type="text/html"></iframe>
Texte seul - Permalink - Snippet public posté le 19/09/2015