15 years of development experience and I still don't know how to handle recursive calls by default. Lack of practice, no doubt. I’ve found no better explanation than these songs!

Mazeletter is a collection of nine infinitely tiling maze pattern fonts.

SVGs enable full-screen hi-res visuals with a file-size near 5KB and
are well-supported by all modern browsers. What's not to love?

One of the advantages of this API is that you don't have to use a library for this kind of job anymore. The majority of browsers are providing a lot of support for some of the newest and awesome APIs, and this has been improving the experience for users in general, allowing developers to use some native browser APIs and reducing their final code bundle.

Svelte provides an enjoyable DX that doesn’t compromise on UX. I think it’ll soon become common knowledge among UI developers that compilers have an advantage over runtime-only frameworks for hitting this sweet spot.
[…]
We’re happy to pay the costs of early adoption when a technology provides significant advantages, and that’s our bet for Svelte.

I love improvements that just work without any effort required of website owners. […] The less friction we can add to introduce these improvements, the more likely they will be adopted, and there’s no better friction than none at all! Fixing the impact of layout shifts on users for responsive images seems to be one such improvement and the web is all the better for it.

Variable fonts reduce the overall combined file size and automatically reduce the number of network requests by simply being a variable font.
Even if you consider the slightly larger file sizes, when combined with improved font compression formats like WOFF2, font subsetting and font loading techniques like font-display: swap; we end up in a situation where we can still get smaller overall font file sizes as well as a significant increase in stylistic opportunity.

Your language isn't broken, it's doing floating point math. Computers can only natively store integers, so they need some way of representing decimal numbers. This representation comes with some degree of inaccuracy. That's why, more often than not, .1 + .2 != .3.

A great IEEE 754 visualization

To make sure our apps are as reliable and accessible as possible, especially in an increasingly globalized marketplace, we need to support constrained devices—they're how most users are accessing the web globally. OMT offers a promising way to increase performance on such devices without adversely affecting users of high-end devices.

Sans accessibilité réelle, ces outils ne fonctionnent pas bien. Sans accessibilité réelle, les personnes handicapées seront toujours handicapées par l’inaccessibilité des sites web. C’est une aberration de vendre ces outils en les opposants à la mise en accessibilité d’un site web. Oui, c’est moins cher mais c’est parce que ce n’est pas du tout la même chose. La magie n’existe pas.

And there you have it, a way to change the font-display settings of a page when using WebPageTest. No need to manually update the code to see what effect the property has on a pages perceived performance.

In this post, I’ll discuss what I did at ALDO to measure the revenue impact of web performance without having to spend time making performance improvements.
[…]
Back in October, rendering performance was something we had never focused on. Nobody was really talking about it, so there must be nothing there. It was only after we started measuring that we saw the potential.

A lot of performance issues stem from them simply not being very noticeable to those of us doing the building. Changing that wherever we can is one of the best ways to make sure that all that low-hanging fruit doesn’t go overlooked.

The prefers-reduced-data media feature is used to detect if the user has a preference for being served alternate content that uses less data for the page to be rendered.

It’s become a trend for developers to reach for frameworks on every single project. Some people are of the mindset that separating HTML and JavaScript is obsolete, but this isn’t true. For a simple static website that doesn’t need much user interaction, it’s not worth the trouble. The more enthusiastic React fans might disagree with me here, but if all your JavaScript is doing is creating a non-interactive webpage, you shouldn’t be using JavaScript. JavaScript doesn’t load as fast as regular HTML, so if you’re not getting a significant developer experience or code reliability improvement, it’s doing more harm than good.

Si en réalité il est possible de décrire les choses correc­te­ment (bien entendu que c’est possible), alors insé­rer une formu­la­tion exagé­ré­ment large sert surtout à faire peur à l’em­ployé, à espé­rer qu’il se retien­dra plus que néces­saire, ou à pouvoir arbi­trai­re­ment lui repro­cher ce dont on jugera gênant après-coup.

Do you want your website to be fast and reliable? Don't use an EV certificate.

Varnish is definitely a way to go about Magento 2 full page cache in production mode. It is a lot faster than the default built-in option.