Sites like Sandbox.io, CodePen and Vue are all logical stops for the blossoming developer who's looking to do cool things like, I don't know, create mock-ups of popular social media sites such as Instagram. I'm not going to wax legal on this, but it's a cool side effect of visiting sites that people love and deciding to build your own third-party spin on it to add features that the actual company never gets around to. This is, of course, why there are so many mock-up mobile apps that stand in place of Facebook and other social media options that are cited to eat up memory, processing power and battery life.
As you'll notice in the Instagram mock-up, a few minor elements are missing such as the floating heart icon when you upvote a feed item. This isn't really a big deal, and we daresay that it makes for a nice personal touch. Otherwise, you can see just how functional that short strip of feed content really is. You can double-click the images to upvote or hit the little heart icon, but not much else can be done from here. Of course, it's not a fully functional example either; for example, clicking the heart icon will raise the likes counter on that image, but refreshing the page will reset it. Still, it's a good theoretical design, and who knows: Maybe you'll pull off a site of your own one day by copying a major one. For more information click here https://codepen.io/itslit/pen/OvZrvR.