#mdn
LightNews LightNews
developer.mozilla.org
Ever wish HTTP status codes were easier to remember? 🖼️

Check out this MDN cheatsheet that pairs each status code with an emoji to help you visualize what each one means, from 200 OK ✅ to 418 I’m a teapot 🫖

Check it out 👇
A colorful infographic titled “MDN HTTP Code Cheatsheet with Emojis.” It categorizes HTTP status codes using emoji-enhanced lists grouped by status code classes.
November 11, 2025 at 9:00 PM
random-mdn.bsky.social
🦖 Random MDN: true 🦖

https://developer.mozilla.org/en-US/docs/Web/XML/XPath/Reference/Functions/true

The true function returns a boolean value of true.

#webdev
true
The true function returns a boolean value of true.
developer.mozilla.org
November 14, 2025 at 1:45 AM
random-mdn.bsky.social
🦖 Random MDN: PerformanceObserver: PerformanceObserver… 🦖

https://developer.mozilla.org/en-US/docs/Web/API/PerformanceObserver/PerformanceObserver

The PerformanceObserver() constructor creates a new PerformanceObserver object with the given observer callback. The observer callback is in…

#webdev
PerformanceObserver: PerformanceObserver…
The PerformanceObserver() constructor creates a new PerformanceObserver object with the given observer callback. The observer callback is in…
developer.mozilla.org
November 18, 2025 at 1:43 AM
lilmousesl.bsky.social
@abnormality.is open until the 28th of November! 👽
Head: .:CERBERUS:.( @cerberus-art.com )- Sonder Pup
Mod: [RaptorJenny] - Bloodhund (Neptune colorant)
Outfit: MDN - Area69

#SecondLife // #SL // #SLFurry // #Furry
cute blue space alien doggo holding an alien labubu >:)
November 11, 2025 at 2:41 PM
random-mdn.bsky.social
🦖 Random MDN: Pseudo-classes 🦖

https://developer.mozilla.org/en-US/docs/Web/CSS/Reference/Selectors/Pseudo-classes

A CSS pseudo-class is a keyword added to a selector that lets you style a specific state of the selected element(s). For example, the pseudo-class :hover can be used t…

#webdev #CSS
Pseudo-classes
A CSS pseudo-class is a keyword added to a selector that lets you style a specific state of the selected element(s). For example, the pseudo-class :hover can be used t…
developer.mozilla.org
November 15, 2025 at 1:41 AM
random-mdn.bsky.social
🦖 Random MDN: -webkit-mask-repeat-x 🦖

https://developer.mozilla.org/en-US/docs/Web/CSS/Reference/Properties/-webkit-mask-repeat-x

The -webkit-mask-repeat-x property specifies whether and how a mask image is repeated (tiled) horizontally.

#webdev #CSS
-webkit-mask-repeat-x
The -webkit-mask-repeat-x property specifies whether and how a mask image is repeated (tiled) horizontally.
developer.mozilla.org
November 14, 2025 at 12:43 PM
developer.mozilla.org
Which image format really gives you the best balance between speed, size, and quality? 🤔

In this hands-on MDN post, Polina Gurtovaia runs real compression experiments (AVIF vs. JPEG 🐿️) and breaks down how to pick the right codec for your workflow.

developer.mozilla.org/en-US/blog/...
Image formats: Codecs and compression tools | MDN Blog
Image compression involves countless trade-offs between quality, size, and speed. In this final part of the series, we experiment with codecs, metrics, and tools to find practical ways to balance efficiency and visual fidelity.
developer.mozilla.org
November 13, 2025 at 5:00 AM
aprl.moe
i’m back home now, and so this is my day 3 and final #MozFest sticker update!

i’m glad i ended up going, there were lots of interesting talks and booths, i got to meet some people, i got to explore barcelona, it was really fun!
photo with all my stickers! on my laptop are a “don’t ask for my number, dm me on germ”, a blacksky algorithms, a mdn, a mozilla, a shiny mozilla festival, a “fork the system”, a firefox logo, a mozilla festival and for loose stickers we have the sticker sheet from mozilla, a couple different mozilla data collective stickers, a non-shiny mozilla festival sticker, a different colorway of the blacksky sticker and a big version as well, one more of each germ sticker, a firefox fan club sticker, a firefox nightly sticker, another mdn sticker
November 11, 2025 at 10:36 AM
developer.mozilla.org
🧩 Your supply chain is only as strong as its weakest dependency.

From securing build tools to verifying external scripts, this new MDN guide by @openwebdocs.org walks you through steps to protect your projects from supply chain attacks.

Read the guide 👇
developer.mozilla.org/en-US/docs/...
Supply chain attacks - Security | MDN
A software supply chain consists of all the software and tools used to create and maintain a software product. This includes not only the software developed for the product itself but all the software and tools used in its production.
developer.mozilla.org
November 10, 2025 at 9:00 PM
dw.whey.party
what about a MDN for open social apps so we can see what features are considered baseline and safe to use
November 9, 2025 at 3:18 PM
dbushell.com
POV you're a professional web developer who knows their stuff
a sequence of browser tabs for web searches followed by MDN documentation pages
November 7, 2025 at 10:33 AM
random-mdn.bsky.social
🦖 Random MDN: USBConfiguration 🦖

https://developer.mozilla.org/en-US/docs/Web/API/USBConfiguration

The USBConfiguration interface of the WebUSB API provides information about a particular configuration of a USB device and the interfaces that it supports.

#webdev
USBConfiguration
The USBConfiguration interface of the WebUSB API provides information about a particular configuration of a USB device and the interfaces that it supports.
developer.mozilla.org
November 9, 2025 at 6:29 AM
developer.mozilla.org
MDN is more than just a resource. It's a community of developers, contributors, and learners passionate about web development.

Contribute to,
📚 MDN documentation
🤝 Help other devs
💟 Localize content
📝 Review or write on MDN

Start now 👇
developer.mozilla.org/en-US/commu...
Contribute to MDN
The MDN Web Docs site provides information about Open Web technologies including HTML, CSS, and APIs for both Web sites and progressive web apps.
developer.mozilla.org
November 6, 2025 at 12:00 PM
paraver.bsky.social
Tresanda a corrupção. São gastos milhões em equipamentos que dizem ser para ser usados no #INEM. Paga o MDN. O equipamento não pode ser usado como resgate médico nem ser utilizado para fins militares. O Governo recusa explicar como foram adquiridos. Alô PJ?
November 7, 2025 at 1:24 PM
ruten.bsky.social
IT系は「けっきょく原文を読む」が多く、MDNはそれがほぼ不要だったんだけど、今後は厳しくなりそうだなあ。

Mozillaのサポートページを和訳してきた日本語コミュニティが解散、Mozillaが勝手に機械翻訳ボットでページを上書きし始めた
gigazine.net/news/2025110...
Mozillaのサポートページを和訳してきた日本語コミュニティが解散、Mozillaが勝手に機械翻訳ボットでページを上書きし始めたため
Firefoxの開発元であるMozillaのサポートページは有志によって日本語を含む世界中の言語に翻訳されています。ところが、2025年10月22日に「Mozillaが作成した機械翻訳ボットが記事を勝手に上書きする」という事態が発生。これを受けて日本語への翻訳を行ってきた日本語コミュニティが解散を宣言しました。
gigazine.net
November 7, 2025 at 9:09 AM
claas.dev
A woman crying subtitled cries in Accept-Language header. A variation of the "Cries in Spanish" meme. The "Accept-Language header" part is copied from MDN and layered over the original subtitle text.
November 7, 2025 at 12:01 PM
random-mdn.bsky.social
🦖 Random MDN: IntersectionObserver: delay property 🦖

https://developer.mozilla.org/en-US/docs/Web/API/IntersectionObserver/delay

The delay read-only property of the IntersectionObserver interface indicates the minimum delay between notifications from this observer.

#webdev
IntersectionObserver: delay property
The delay read-only property of the IntersectionObserver interface indicates the minimum delay between notifications from this observer.
developer.mozilla.org
November 8, 2025 at 1:37 AM
random-mdn.bsky.social
🦖 Random MDN: :invalid 🦖

https://developer.mozilla.org/en-US/docs/Web/CSS/Reference/Selectors/:invalid

The :invalid CSS pseudo-class represents any
,
, or other element whose contents fail to validate.

#webdev #CSS
:invalid
The :invalid CSS pseudo-class represents any <form>, <fieldset>, <input> or other <form> element whose contents fail to validate.
developer.mozilla.org
November 6, 2025 at 6:32 PM
developer.mozilla.org
🧩 Your supply chain is only as strong as its weakest dependency.

From securing build tools to verifying external scripts, this new MDN guide by @openwebdocs.org walks you through steps to protect your projects from supply chain attacks.

Read the guide 👇
developer.mozilla.org/en-US/docs/...
Supply chain attacks - Security | MDN
A software supply chain consists of all the software and tools used to create and maintain a software product. This includes not only the software developed for the product itself but all the software and tools used in its production.
developer.mozilla.org
November 5, 2025 at 7:00 AM
stefanjudis.com
Did CSS @scope just hit Firefox Nightly?! 😲 #baselineHereWeCome

Release notes: www.firefox.com/en-US/firefo...

MDN: developer.mozilla.org/en-US/docs/W...
@scope (.article-body) to (figure) { img { border: 5px solid black; background-color: goldenrod; } } The @scope rule is now supported, allowing authors to restrict styling to a subtree of the DOM. This avoids having to write overly-specific selectors.
November 4, 2025 at 9:44 PM
random-mdn.bsky.social
🦖 Random MDN: EditContext: attachedElements() method 🦖

https://developer.mozilla.org/en-US/docs/Web/API/EditContext/attachedElements

The attachedElements() method of the EditContext interface returns an Array that contains only one item. This item is the element that's associated with t…

#webdev
EditContext: attachedElements() method
The attachedElements() method of the EditContext interface returns an Array that contains only one item. This item is the element that's associated with t…
developer.mozilla.org
November 5, 2025 at 6:31 PM
random-mdn.bsky.social
🦖 Random MDN: Math.expm1() 🦖

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Math/expm1

The Math.expm1() static method returns e raised to the power of a number, subtracted by 1. That is

#webdev #JavaScript
Math.expm1()
The Math.expm1() static method returns e raised to the power of a number, subtracted by 1. That is
developer.mozilla.org
November 5, 2025 at 1:44 AM
bluesky.awakari.com
New on MDN: Supply chain attacks @ mdn https:// developer.mozilla.org/en-US/do cs/Web/Security/Attacks/Supply_chain_attacks # ECMAScript # JavaScript

Interest | Match | Feed
Origin
mastodon.online
November 2, 2025 at 11:57 PM
vale.rocks
I don't know what you know already, but a good (free) starting resource is MDN: developer.mozilla.org/en-US/docs/W...

@sarasoueidan.com has a full and practical course: practical-accessibility.today

There is also WAI's resources:
www.w3.org/WAI/roles/new/
Resources for Getting Started with Digital Accessibility
To get started learning about digital accessibility, read the Introduction to Web Accessibility.
www.w3.org
November 2, 2025 at 9:07 AM
crissov.de
MDN and CanIUse don’t record any implementations of `random()` or `random-item()` yet. Safari TP has been supporting the former for a while now, but I never checked myself whether they also added the latter.

webkit.org/blog/17285/r...
Rolling the Dice with CSS random()
Random functions in programming languages are amazing.
webkit.org
November 2, 2025 at 1:46 PM