One of the (few) really neat things about OpenPublish on Drupal is the image system. Here, you upload an image once, and the system creates several versions of the image, which can be used by a device-aware system (which OpenPublish isn't) to put small images on small screens and bigger images on the large screens. As Webmonkey says, "web authors use a variety of hacks to (incompletely) work around this problem, but to really solve it the web likely needs new tools." Using HTML, for example, that will read information from the head of the document to serve the right image.
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] [![Image from the website](https://downes.ca//files/images/post_58188.jpg)