One of the hardest questions to answer related to Core Web Vitals is how to masure them in a Single-Page Application (SPA).

A map of accessibility laws by country/region.

While implementing third-party resources has downsides for performance and you should self-host your assets when possible, sometimes relying on external files is unavoidable. But be warned — using them can sometimes cause real headaches.

The only thing React is better at than other front-end frameworks is being popular. So how long will that self-perpetuating cycle continue?

Numéros de téléphone réserver aux œuvres de fiction :

• 01 99 00
• 02 61 91
• 03 53 01
• 04 65 71
• 05 36 49
• 06 39 98

Décision n° 2018-0881 du 24 juillet 2018 de l'Autorité de régulation des communications électroniques et des postes établissant le plan national de numérotation et ses règles de gestion

New web services are being built to a self-defeatingly low UX and performance standard, and existing experiences are now pervasively re-developed on unspeakably slow, JS-taxed stacks. At a business level, this is a disaster, raising the question: why are new teams buying into stacks that have failed so often before?

An updated overview of image loading optimization methods to improve LCP.

I guess the point I’m making in a way here is that I could never win a “dev race” because it takes me ages to even get to the point of writing code and that’s been the case for a lot of years now. The benefit to being like this though is I get to put out fires before they even start.

See also CSS tricks

Drag-and-drop a trace (or select a file)
We'll upload it and give you a shareable URL, with the Chrome DevTools Performance Panel…
Traces expire after 90 days. 🕶

In short, we wanted our list of top web performance recommendations to focus on:

• Recommendations we believe will have the largest real-world impact
• Recommendations that are relevant and applicable to most sites
• Recommendations that are realistic for most developers to implement

Priority Hints are used to indicate to the browser the relative priority of a resource. I take a deep dive into how you can improve your Largest Contentful Paint by using fetchpriority.

Designing, developing or leading a web project (or an app) have inherent constraints, and adding to them might take time and resources you do not have. On the other hand, avoiding non-quality can bring you much in lost revenue through better position on search engines, better compatibility, speed and accessibility leading to a lesser quit rate, or better word-of-mouth following great after-sale service.

A tree view (collapsible list) can be created using only html and css, without the need for JavaScript. Accessibility software will see the tree view as lists nested inside disclosure widgets, and the standard keyboard interaction is supported automatically.

La microtypographie, bien appliquée sur votre site Web peut grandement améliorer la lisibilité. Regardons de plus près comment ça fonctionne !

For technical teams I advise to additionally track LCP(FE), or the Front End Component of LCP.

If nothing else, my hope is that this post helped shed some light on the fact that LCP is, by its very nature, a dynamic metric that is heavily dependent on user behavior. You can’t always know ahead of time what the LCP element is going to be for a given page, so it’s important that your optimization techniques can handle a range of possible outcomes, and adapt accordingly.

Le jeu de l'organisation de l’amélioration de l’accessibilité (OAA) vous guide dans la mise en accessibilité de votre service numérique.

Basé sur la dernière version du référentiel général d'amélioration de l'accessibilité (RGAA 4.1) vous pouvez :

• Faire un audit rapide (25 critères)
• Faire un audit complémentaire (50 critères)
• Faire un audit complet, dit de conformité (106 critères)
• Générer vos rapports d’audit et vos déclarations d’accessibilité

When measuring web performance, we often try to get a single number that we can trend over time. This may be the median page load time, hero image time, page speed score, or core web vitals score. But is it really that simple?