Days Of Christmas Cards

What Days Of Christmas Cards Actually Is

Days Of Christmas Cards is a web-based animation tool that creates a scrolling horizontal feed of festive card-style illustrations, usually driven by JavaScript and HTML5 canvas or CSS transforms. People use it for holiday landing pages, email headers, or just because it looks nice on a portfolio. It's not a downloadable application — you embed it, configure it, and move on. The first thing to understand is that there's no installer. You pull the repo or grab the asset pack, drop the CSS and JS files into your project directory, and link them in your HTML. The typical setup looks something like this: <link rel="stylesheet" href="days-of-christmas-cards.css">
<script src="days-of-christmas-cards.js"></script>

Then you create a container element with an ID that matches the configuration object. That's it for the basic version. If you're using the full package with sprite sheets and custom themes, you'll also need to drop image assets into an assets/ folder relative to your root. I ran into a problem once where the cards weren't rendering at all on a staging server. Took me twenty minutes to realize the JS file path had a trailing slash mismatch from the hosting setup. The error logs were silent. The browser console just said undefined is not a function because the stylesheet never loaded and the DOM elements never got initialized. Double-check your paths first before diving into anything else.

Configuration and Customization

The configuration object accepts a handful of options. The most commonly adjusted ones are the card array (your images or SVGs), the scroll speed in milliseconds per frame, the loop mode, and the responsiveness breakpoint. Here's a typical config: new DaysOfChristmasCards({
  container: '#xmas-feed',
  cards: ['./assets/card-1.svg', './assets/card-2.svg'],
  speed: 120,
  loop: true,
  responsive: true
}); Speed is the trickiest setting. Lower numbers scroll faster. At around 60, it looks chaotic. At 200 or above, it barely moves. The sweet spot for most use cases sits between 80 and 140 depending on how many cards you load and the viewport width.

One thing beginners miss: the responsive mode doesn't actually resize the cards. It only adjusts the container width and hides overflow. If you want the cards to scale visually on mobile, you need to add your own media query or use CSS transform: scale() on the container. The library won't do that for you out of the box.

Performance Considerations

This thing is not lightweight. Each card adds a DOM node and a render cycle per animation frame. Loading more than twelve cards on a low-end device will stutter the scroll noticeably. I learned this the hard way when a client wanted sixty cards animated across the top of a mobile email header. It crawled at about four frames per second on a Galaxy S8. The workaround is simple but annoying: use a sprite sheet instead of individual image nodes. Bundle all your cards into a single canvas draw call. The library supports this if you pass the sprite configuration correctly, but the documentation glosses over it in two sentences. You'd think they'd mention it more prominently given the performance impact. Another bottleneck is the requestAnimationFrame loop. It runs continuously even when the page is scrolled out of view. On pages with heavy traffic, this adds up. I added a Visibility API check to pause the animation when the tab isn't active. Cuts CPU usage by roughly sixty percent on idle pages. The library doesn't include this by default, so you have to wire it yourself.

Common Pitfalls

The library depends on a specific DOM structure. If your framework (React, Vue, whatever) injects wrapper divs around your target container, the internal queries fail silently. The cards just don't appear. Wrap your container in a plain div without any framework scaffolding, or use a ref with a direct DOM selector at the bottom of the render cycle. Another issue: cross-origin image loading. If your cards are pulled from a CDN or an external asset bucket, the browser may block them depending on your CORS headers. I've seen this kill entire animations with no error message. The fix is adding proper Access-Control-Allow-Origin headers on the image server, or hosting the assets on the same origin. There's also no built-in touch swipe support. On mobile, users can't interact with the card feed beyond passive viewing. If interactivity matters, you'll need to layer in a gesture library or build swipe detection yourself. I used Hammer.js for a project once and integrated it by listening to pan events and manually advancing the animation index. It took about an hour to get working reliably.

When to Use Something Else

If you need accessibility compliance — keyboard navigation, screen reader labels, reduced motion support — this library won't help you. It has none of those features baked in. For a production site that needs to meet WCAG 2.1, you'd be better off building a custom component or using a dedicated carousel library that already handles those concerns. For simple static holiday banners without animation, CSS keyframes or a GIF is faster to implement and zero JavaScript dependency. The trade-off is you lose the dynamic card loading and config flexibility. Decide what you actually need before committing to the full setup. The official repository is hosted on GitHub under the name days-of-christmas-cards. Pull the source from there, read the changelog for version-specific breaking changes, and test on the devices your audience actually uses. The demos look great on desktop. That's not always the same as how it performs in the wild.