Responsive Design Testing Bookmarklet

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DigitalOcean joining forces with CSS-Tricks! Special welcome offer: get $100 of free credit.

Bookmarklet by Benjamin Keen which automates an idea by Lennart Schoors where the current page is loaded into a bunch of differently sized iframes, so when working on a large monitor, you can see what a design looks like at a bunch of different smaller sizes quickly and all at once.

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