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The Web Weekly newsletter keeps you up to date, teaches you web development tricks and covers all things working in tech.

Guten Tag! Guten Tag! 👋

When will align-content work in divs? Does the new popover attribute improve accessibility? And why does margin: auto work on absolutely positioned elements?

Turn on the Web Weekly tune and find all the answers below. Enjoy!

But before, the Web Weekly music queue is almost empty. If you enjoy discovering and sharing new music, send me your favorite tracks to keep the Web Weekly jukebox playing.

Ellen listens to "Slut — If I had a heart" and says:

"If I Had a Heart" creates an aura full of melancholy and a unique atmosphere, as if the song itself was my heartbeat. Would it sing or cry?

How many Git commands do you use regularly? I'm the add -p, commit, push'n'pull kinda guy. I might even be able to perform a fancy rebase now and then. But do I know what I'm doing? Not really.

How can you level up your Git skills?

The following talk series is a trick rapid-fire. The videos have jump marks so you can pick your topics. Highly recommended.

Cover slide: So you think you know Git.

Additionally, Julia Evans started digging into Git. As always, her articles are approachable yet super informative.

What are your favorite Git resources?

Something that made me smile this week

Color match game in which you have to match a color with a color picker.

How good are your eyes (or monitor) when differentiating colors? Find out with colormatch.

Match colors

Open tabs

Two ways to compose components

1) Nesting composition uses wrapping elements to modify functionality 2) Merging composition smashes elements together destructively to achieve new ones

How do you extend your Frontend components and make them configurable? Easy — slap an is-active or h-full class onto it and call it a day, right?

But the more class modifiers you add to your components, the trickier it gets. It's one of these problems that becomes harder with every change. Component and design system design is tough.

Kyle Shevlin's post on component compositions triggered some thoughts, and I think I changed my approach to component creation now.

Think about composition

TIL — auto-margin works on absolute positioned elements

Demo showing how margin: auto centers an absolute positioned element.

It can't just be me who hasn't applied margin: auto to absolute positioned elements before, can it? I learned this week that you can center elements (X and Y axis) with a smart combination of inset, width and margin.

Center like a pro

disabled vs aria-disabled

The disabled attribute is totally fine and should be used when relevant! What’s important is not to use it when the element’s interactivity is necessary to proceed, or when the lack of discoverability is problematic. In these cases, the aria-disabled attribute is better to still convey the same semantics, without impairing on usability.

Short'n'sweet: Kitty Giraudel published a straightforward recommendation on when to use readonly, disabled and aria-disabeld.

Use the best attribute

You're halfway through!

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The wonderful weird web –

Google docs with an empty document prefilled with "stuff" followed by the sentence "That feeling when you just wanted an empty document but three managers from different teams want your attention.

The Grumpy website complains about what's wrong with the web today. We're talking weird dialogs, cluttered UIs, unlogical user flows, unreachable footers, [PLACE YOUR WEB ANNOYANCE HERE]...

Let's stand up and yell "YES! This annoys me, too!" together!

Be grumpy

What are your favorite internet corners? Send them my way, and I'll include them in Web Weekly!

What's the fuzz about this new React compiler?

So what's left? 1) Proof of concept 2) (mostly) complete compiler 3) initial adoption + iteration (we're here!) 4) rollout at Meta + refinement 5) release

While it won't be released anytime soon, React will eventually transform into a compiled Framework. If you think this sounds like a drastic change, it is. Nadia Makarevich does a great job summarizing what's on the horizon.

What could change with the React compiler?

Things to expect when advocating for web accessibility

The "technical" reasons why something can't be accessible are almost always "people" reasons, actually. I'm sorry, but you're going to spend a lot of time teaching people about alt text on images. The business doesn't care about what you think is morally good for society.

Heather Buchel reflects and shares lessons learned when advocating for an accessible web. It's a fantastic read!

Understand why it's tough to advocate for accessibility

Grid, subgrid and breaking user agent styles

HTML inspector showing that an ordered list with 4-diget numbers is overflowing.

What happens if your HTML content includes an ordered list with over a thousand entries? Correct! The use agent styles start to break, and the list markers will overflow.

It's wild how inflexible the default styles are in this area, but Noah Liebman shared how to solve this issue with a fancy subgrid!

Avoid list overflow

The different font size problem

Visualization of two characters explaining what's 'em', 'cap-height', 'X-height' and the baseline

Have you ever discovered how difficult mixing and matching different fonts in a paragraph is? It's surprising how challenging it is to align different fonts and make them equal in size.

Theoretically, font-size-adjust solves this problem, but browser support is still lacking. Com'on Chromium!

Rasmus Fløe shared how you can still align all these different fonts with some font analysis.

Align fonts

Someone should build a quick tool to align fonts automatically. If that's you, let me know!

popover accessibility

The thing with the popover attribute is that it doesn’t have a built-in role. After all, it’s not an element. Its purpose is to only add “popover behaviour”, as discussed in Popover semantics. In that sense, popover is a bit like tabindex or contenteditable. These attributes also add behaviour: tabability and editability behaviours, respectively.

On the bright side, popover cross-browser support is just around the corner. Chromium has shipped the new attributes since 114, Safari has supported them since 17, and Firefox includes the new UI features in the nightly channel.

But what do the popover and popovertarget attributes mean for accessibility? Hidde de Vries and Scott O’Hara went deep into this topic.


  • aria-expanded state is handled automatically.
  • aria-details is sometimes applied.
  • role="group" is sometimes applied.
  • focus handling is built-in.

Learn about popover internals

Random MDN – dfn

<p>A <dfn id="def-validator">validator</dfn> is a program that checks for syntax errors in code or documents.</p>

From the unlimited MDN knowledge archive...

Have you used the dfn HTML element? Maybe you should give it a try.

Define terms

TIL recap – Intl.Segmenter

Interacting widget showing how to use `Intl.Segmenter`.

Intl.Segmenter reaches cross-browser support with Firefox 125 (shipping on April 16). Then, we'll have a native way to split strings into words, sentences, and even graphemes.

Split the strings

Find more short web development learnings in my "Today I learned" section.

New on the platform

All existing form controls in vertical mode.

With Safari 17.4, vertical form controls are available on the web. How can you flip the controls? A writing-mode: vertical-rl; does the trick! Neat.

Unfortunately, I can't read a top-to-bottom language, so I don't see myself using vertical textareas, inputs or selects soon. But a vertical range slider or progress indicator — I'm game!

A vertical range slider and progress element.

The support info for vertical form elements isn't ready on MDN, but I checked <input type=range> and <progress> in the current Chrome, Firefox and Safari Tech Preview. The two worked fine.

But in other news, when it comes to centering elements in block layouts via align-content, MDN compat has all the data.🎉

Very green support table for align-content support in block layouts

And as you see above, we're almost there. Centering elements in a div becomes a fancy CSS one-liner soon!

Three valuable projects to have a look at

A new Tiny Helper

TypeScript AST Viewer

For the TS nerds: the TS AST viewer helps you understand how the TypeScript compiler parses your beautiful code.

Understand TS a bit better

Find more single-purpose online tools on

Thought of the week

Reminder: don't use underlines when designing documents, sites, slides, or anything that can be consumed with a digital device. 😅

Underlining basically only exists now to confuse people into thinking something is a link that they can click on.

Anil Dash has some more solid advice in "Make better documents".

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Thank you! 💙

And with that, take care of yourself - mentally, physically, and emotionally.

I'll see you next week! 👋

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About Stefan Judis

Frontend nerd with over ten years of experience, freelance dev, "Today I Learned" blogger, conference speaker, and Open Source maintainer.

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