Css – Scale iFrame css width 100% like an image

cssiframeresponsive-design

I want to scale an iFrame through CSS to width: 100%, and the height should scale proportionally to the width.

With an <img> tag this works fine.

Both the image and the iFrame have defined width and height in the html.

Here some examples:

<html>
    <style>
        #a{ width: 500px; }
        img{ width: 100%; height: auto }
    </style>
    <body>
        <div id="a">
            <img src="http://lorempixel.com/200/150/" width="200" height="150" />
        </div>
    </body>

This works great on images, but I would like the same behaviour for iFrames:

<html>
    <style>
        #a{ width: 900px; background: grey;}
        iframe{ width: 100%; height: auto }
    </style>
    <body>
        <div id="a">
            <iframe width="560" height="315" src="http://www.youtube.com/embed/RksyMaJiD8Y" frameborder="0" allowfullscreen></iframe>
        </div>
    </body>

The iFrame renders 100% wide but does not scale it's height proportional like the image does.

Best Answer

Big difference between an image and an iframe is the fact that an image keeps its aspect-ratio. You could combine an image and an iframe with will result in a responsive iframe. Hope this answerers your question.

Check this link for example : http://jsfiddle.net/Masau/7WRHM/

HTML:

<div class="wrapper">
    <div class="h_iframe">
        <!-- a transparent image is preferable -->
        <img class="ratio" src="http://placehold.it/16x9"/>
        <iframe src="http://www.youtube.com/embed/WsFWhL4Y84Y" frameborder="0" allowfullscreen></iframe>
    </div>
    <p>Please scale the "result" window to notice the effect.</p>
</div>

CSS:

html,body        {height:100%;}
.wrapper         {width:80%;height:100%;margin:0 auto;background:#CCC}
.h_iframe        {position:relative;}
.h_iframe .ratio {display:block;width:100%;height:auto;}
.h_iframe iframe {position:absolute;top:0;left:0;width:100%; height:100%;}

note: This only works with a fixed aspect-ratio.

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