Andrea Verlicchi's Blog

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Check if an element is still inside viewport after a given time

What would you do if somebody asked you to load a DOM element only if it stays inside the viewport for a given time? You would use vanilla-lazyload, wouldn’t you? 😉 This is exactly what the GitHub community asked for as new feature in LazyLoad, to avoid loading elements which users skipped by scrolling fast beyond them. In this post, I’d like to share the solution with you.

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Changing text color for contrast based on background lightness

If you had to change the color of some fixed-positioned text based on the lightness of its scrolling background, how would you do that? CSS filters, blend modes? But what if you had to support all browsers, including Internet Explorer? Here are a couple of ways to do that using CSS clip and clip-path.

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Slides of my talk about responsive images at CSS Day 2017

e On March 17th 2017 I spoke about responsive images, an HTML 5.1 standard at the CSS Day 2017 Conference in Faenza, Italy. The speech was on web performance, since using responsive images is a way to serve lighter images to smaller screens (and viceversa) and images optimization. I also took a sneak peek on how to generate the right size for your images in the cloud using a software as a service.

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