We all hate img’s `sizes` attribute. It’s a workaround for: “A browser can’t know about the space an image will occupy in a layout because it makes decisions about image requests long before it has the information it needs to render that layout” But now there is <img loading=lazy sizes=auto 🥳

I disagree with blaming full-stack eng. But this definitely resonated: "It isn’t about awareness. It’s about who’s writing the front-end code, and whether they’re qualified to write it. [frontend skills] require years of focused attention. They require someone whose job it is to care about them"

Had a blast on @typescript.fm We talked about why I started Mastro, the design decisions behind it, and why modern #webdev feels harder than it should. Thanks a lot for having me, Kamran and Erik!

How can a complete web framework be ~700 lines of TypeScript? For one, everything is a route in Mastro. mastrojs.github.io/blog/2026-01...

Congrats! Developing and maintaining a complex framework takes lots of funding, and I’m glad Astro found a new home. With Mastro, we have a different approach. The name originally stood for minimal Astro, and we’re staying true to that. At just ~700 lines, Mastro will always be easily maintainable.

Web Performance Calendar day 28 when Ian Duffy shows us how to tame Chrome’s Performance panel: reduce noise, search fast, annotate, use Insights, and customize tracks calendar.perfplanet.com/2025/tips-fo...

Is “web components” finally no longer considered a dirty word by anyone outside the React-die-hard circle? thenewstack.io/web-componen...

Thanks for having me @stoyan.me !

New blog post on how to incrementally migrate from Express.js to the standards-based Request/Response-API mastrojs.github.io/blog/2025-11...

Besides running on Deno, Node.js, and inside a web browser as a VSCode extension, Mastro now also runs on Bun! 🥳 mastrojs.github.io

I wrote down "what I learned porting Mastro from Deno to Node.js" Hope my learnings help somebody on their next server-side JS/TS project! mastrojs.github.io/blog/2025-10...

Mastro now runs on Node.js 🎉🍾 Deno makes your life still a bit easier, but I can appreciate that people like Node’s commitment to stability. And it’s catching up: can run TypeScript natively now, has a builtin --watch flag and test runner, etc. Share if you care! mastrojs.github.io

Mastro (currently Deno and browser only web framework) is coming to Node.js! Just not sure whether via JSR (and they recommend pnpm), or via old NPM. Thoughts?

With all the excitement of view transitions coming to Firefox (which is great!), just be aware that cross-document view transitions for MPAs are “level 2” and thus only in Chrome and Safari so far. But I’m sure it won’t be long, and it’s just a progressive enhancement. No reason to not add it now!

I always used to like the vibes in the Ruby community. Between DHH and Ruby Central, sorry to hear that bullshit has come to those shores as well.

Nice article about when it might, or might not make sense to inline critical CSS. csswizardry.com/2022/09/crit...

New chapter is up, showing how you can precompute assets and HTML pages in a unified way. (spoiler: it’s just like static site generation, but for only a subset of routes) #WebDev mastrojs.github.io/guide/bundli...

In order for mastrojs.github.io to have an Atom feed, of course I had to add a new module to non-core: jsr.io/@mastrojs/ma...

Can't believe what I'm reading. Accidentally DDoS yourself because you fetch in useEffect in 2025 is so avoidable 😂 blog.cloudflare.com/deep-dive-in...

I keep saying that there is no empirical evidence that vibe coding makes people more productive I believe vibe coding users keep confusing "I enjoy coding in this way" (believable, subjective) with "I'm more productive coding in this way" (unsupported, dubious to me) substack.com/inbox/post/1...

I’m thinking of selling an EPUB version of The Mastro Guide (which will remain free to read online): mastrojs.github.io/guide/ Anybody has any experience with publishing an ebook or can recommend a publisher or self-publication platform that handles payments etc? Please share for further reach 🤗

I’m really happy with HTTP-first assets in Mastro: create a GET route that responds with the transformed image or bundled CSS/JS. For static site generation, you’re done. For server, add an `export const pregenerate = true` and add the build step to your CI/CD. mastrojs.github.io/guide/bundli...

“Preload only the fonts that are actively used above the fold.” www.erwinhofman.com/blog/should-...

While Mastro is proudly #nobundler by default, I’ve started writing a chapter about what you’d do if you’re unfortunate enough that your client-side JS has grown beyond a few dozen of files: mastrojs.github.io/guide/bundli...

True, but the use-cases where an SPA make sense really seem to shrink every year. Has there been an HTML attribute or similar proposed that would keep an element’s scroll bar position or an input’s text and cursor position across page transitions, if it has the same id? Similar to view transitions?

modern CSS is so good. need to take a color from your design system, desaturate it and lower the opacity? oh and you want different values for light mode and dark mode, too? boom, easy:

i should explain why i'm so excited about this. i have a love/hate relationship with javascript. it's the most brittle part of the web stack. all else being equal, if you can do something without javascript you probably should.

I rarely link to the orange site, but this is a really good comment: news.ycombinator.com/item?id=4387... Feels like that's the same kind of reasoning like "Nobody was ever fired for choosing React".

That’s why you need to learn HTML and CSS if you’re serious about web design.

Forget SPAs, choose MPAs. We interview @mb21.bsky.social, the creator of @mastrojs.bsky.social, a modern JavaScript meta-framework designed to build multipage apps (MPAs). By @lorainelawson.bsky.social

I was interviewed! Please share to get the word out. I’d love to get a conversation going where Mastro (and web dev in general) should be heading for.

Very exciting news. With these changes, you can more easily build accordions such as seen in this recording. developer.chrome.com/blog/styling... Currently supported in Chrome and Safari, and soon Firefox!

I wonder whether anybody will do a talk similar to this one in a decade, but instead about React and/or bundlers: www.youtube.com/watch?v=wo84...

Does any somewhat standardized url query parameter format exist for image resizings and transforms? I could have sworn I saw a spec on GitHub a while ago, but absolutely cannot find it anymore! Did I hallucinate it? Something like imgproxy or Cloudflare images but they all use different formats.

Really liking CSS Relative colours paired with CSS variables combo 👌 developer.mozilla.org/en-US/docs/W... My variable names could probably do with some work, but it's nice to drop a colour in and have a set of variables ready to go. (I know I'm late to learning OKLCH - soon!)

happy html day ❇️

Saying Astro is “HTML first, framework second” seems to me a bit weird. It is a JS framework after all, just server-first. Wondering what the right framing/messanging here is for Mastro. mas.to/@frontenddog...

On Saturday, August 2nd, 2025, we'll be gathering in places around the world to write and celebrate HTML. Join us ❇️ html.energy/html-day/202...

Need to work on that SEO for mastrojs.github.io

It's time for modern CSS to kill the SPA | Native CSS transitions have quietly killed the strongest argument for client-side routing. Yet people keep building terrible apps instead of performant websites. | www.jonoalderson.com/conjecture/i...

The Astro-based Starlight framework was already very good. But by moving the docs to Mastro itself, I could declutter things even further.

Eat your own dog food, they say. That’s why I’m redoing the docs and guide website using Mastro itself: mastrojs.github.io

Every time, I see @heydonworks.com using custom properties to "hide" usage notes and error messages in CSS, I can only stand up and say "Chapeau, my friend!". 🎩 👏 Love this approach to self-document CSS code. piccalil.li/blog/a-revis...

I love CSS folks. They are soldiers of joy and delight. The world is burning and AI debates have people at each others throats and CSS peeps keep being like “check out this dancing turtle I made out of divs 🥰”

“Many SVG attributes, like the circle’s color (fill) and radius (r), moonlight as CSS properties. This means I can change them in CSS, and even use CSS transitions to animate them! 🤯 This is what makes SVG so powerful.”

I’m sure Joel would enjoy Mastro. joeldare.com/why-im-writi...

It’s funny how I usually tell people to focus on one clear audience, and ruthlessly cut the text on their landing page. But when it comes to my own project, I had such a hard time doing just that. Just too many things I’d love to talk about. Thanks @asmartbear.com for reminding me!

When in the process of writing the Mastro Guide, you end up fixing the MDN article as well.

CSS pro tip: :target { scroll-margin-block-start: 2em; } Adds a nice bit of breathing room to stuff that's anchored via URL like example.​com/#my-element