Demos Tutorials

  • FileReader API

    As broadband speed continues to get faster, the web continues to be more media-centric.  Sometimes that can be good (Netflix, other streaming services), sometimes that can be bad (wanting to read a news article but it has an accompanying useless video with it).  And every social service does...

  • 9 Incredible CodePen Demos

    CodePen is a treasure trove of incredible demos harnessing the power of client side languages.   The client side is always limited by what browsers provide us but the creativity and cleverness of developers always pushes the boundaries of what we think the front end can do.  Thanks to CSS...

  • Simple Image Lazy Load and Fade

    One of the quickest and easiest website performance optimizations is decreasing image loading.  That means a variety of things, including minifying images with tools like ImageOptim and TinyPNG, using data URIs and sprites, and lazy loading images.  It's a bit jarring when you're lazy loading images and they just...

  • Chris Coyier’s Favorite CodePen Demos II

    Hey everyone! Before we get started, I just want to say it's damn hard to pick this few favorites on CodePen. Not because, as a co-founder of CodePen, I feel like a dad picking which kid he likes best (RUDE). But because there is just so...

  • Add Styles to Console Statements

    I was recently checking out Google Plus because they implement some awesome effects.  I opened the console and same the following message: WARNING! Using this console may allow attackers to impersonate you and steal your information using an attack called Self-XSS. Do not enter or paste code that you...

  • Jack Rugile’s Favorite CodePen Demos

    CodePen is an amazing source of inspiration for code and design. I am blown away every day by the demos users create. As you'll see below, I have an affinity toward things that move. It was difficult to narrow down my favorites, but here they are!

  • Geolocation API

    One interesting aspect of web development is geolocation; where is your user viewing your website from? You can base your language locale on that data or show certain products in your store based on the user's location. Let's examine how you can...

  • Sara Soueidan’s Favorite CodePen Demos

    A few months ago, Chris Coyier shared his favorite CodePen demos right here on David's blog. A while back David asked me to share some of my favorite pens too, so here are some of the demos that have blown my mind in the past...

  • Ana Tudor’s Favorite CodePen Demos

    Cocoon I love canvas, I love interactive demos and I don't think I have ever been more impressed by somebody's work than when I discovered what Tiffany Rayside has created on CodePen. So I had to start off with one of her interactive canvas pens, even though...

  • Web Notifications API

    Every UI framework has the same set of widgets which have become almost essential to modern sites: modals, tooltips, button varieties, and notifications.  One problem I find is each site having their own widget colors, styles, and more -- users don't get a consistent experience.  Apparently the...