Responsive Media | Responsive Web Design

The great Ethan Marcotte gave us a simple instruction when it came to dealing with responsive media. All we had to do was apply two CSS rules to a few elements and everything would work perfectly.

To be fair to Ethan, he was mostly correct.  Adding the following code


img {
    width: 100%;
    max-width: 100%;
}

… and then extending that simple block out to


img, iframe, object, embed, video {
    width: 100%;
    max-width: 100%;
}

…. and you are pretty much done with your flexible responsive images.

Pffft….

Solving part of the problem

Yes you now have flexible media, but unfortunately it leaves us with a series of issues.  

What happens if the user is on a slow connection? Well surely we want to serve them a smaller image. 

What happens if the user has a retina screen? Well surely we want to serve them a 2x or 3x size image.

What happens if both of those scenarios are correct?  Oh no!

There are many techniques you can use to

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