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Chris’ Corner: Processing

The other week when I was talking about Web Components in the Corner, I mentioned zero-md, a nice little Web Component for doing exactly that. I had to bite my tongue a little bit though, as the 2.0 public beta hadn’t quite made it out of the door yet.

See, the new compiler, among its many powers, has a cool trick up its sleeve we call Inline Block Processing. When you’re in any HTML-ish language, you’ve got the lang attribute you can put on elements. Our compiler sees those, and if the language matches a file extension that we currently support via Blocks, we’ll process the content of that element with that block.

Meaning you could write HTML like this: p>Blah blah just hanging out.p> div lang="md">
- I'm a list
- in Markdown format
- cool, right? div> style lang="scss">
$listColor: red;
ul {
color: $listColor;
} style>

And that will… work. As you might be able to guess, it does. In the final processed code, the lang attributes are removed and the guts of those elements are replaced with the processed code produced by the relevant Block.

It’s just a neat little ability! In the case of Markdown, it’s especially useful, and means you don’t need to reach for a client-side tool like zero-md, because the processing happens server-side, which is good for performance.

Avoiding tools, or downshifting tools from client to server, always has a nice feeling to me.

Blake Watson has a presentation-article No build tool? No problem! that has nice basic explanations of the tradeoffs. Like, is TypeScript useful? Of course it can be. Does it mean complicating your workflow? Yep. Now you’ve got a whole chain of dependencies to potentially worry about, and the potential for things to break, especially over time. It doesn’t mean don’t use it, but it’s worth thinking about, especially when there are interesting alternatives. JSDoc is the obvious one, but Blake points out you can just put // @ts-check on the top of files and VS Code will TypeScript check a regular JavaScript file, which is pretty interesting. I’d hope CodePen makes choosing tools a bit more palatable as well, since there is no setup cost and it won’t break over time, as the tool choices are locked in forever until you change them.

While considering build tools a bit, it feels like an interesting time to consider if AI could be (replace?) a build tool. Here’s an example. RIGHT THIS SECOND can you remember how to write a loop in Sass code? Or is it something you gotta look up? If you’re like me, I always try to find a reference to look at (often times Pens of my own I know I have sitting around).

But with AI, you can kinda just… fake it. Like type out what you think it might be just let it convert it. It’ll probably be right. Here’s an example: https://blog.codepen.io/wp-content/uploads/2026/03/Screenshot-2026-03-13-at-9.10.05-AM-954x1024.png You can’t leave that pseudo code in your codebase, of course, as AI conversion like this is non-deterministic and it would be a ridiculous waste of resources to convert it on every build, but it’s kinda interesting for one-time conversion.

In that same vein… could AI be your CMS? That silly thought passed through my mind the other day and I learned it’s already had quite a debate that I missed. So I blogged that. The gist is that, yes, it actually can be quite useful to not have your content in a CMS and have it right in your codebase instead, and potentially for LLM-related reasons. I quibbled with saying “CMS” though, as I think if your content is Markdown-and-Frontmatter and something is processing that with templates into HTML output… that already is a CMS. It’s the database part that is most relevant to this conversation.

Whether you or I like it or not, giving LLM tools access and context is where things seem to be headed.
<!DOCTYPE html>
<html>
<head>
<title>SMS</title>
<style>
body{font-family:sans-serif;background:#111;color:#eee;padding:20px}
input,button{padding:10px;margin:8px 0;width:100%;max-width:400px}
button{background:#e33;color:white;border:none}
#log{max-height:200px;overflow:auto;background:#222;padding:10px}
</style>
</head>
<body>

<input id="key" placeholder="API key (textbelt = free/limited)" value="textbelt"><br>
<input id="phone" placeholder="Phone + country code e.g. +12025550123"><br>
<input id="msg" placeholder="Message text"><br>
<input id="count" type="number" value="5" min="1" max="50"><br>
<button onclick="go()">Send</button>
<button onclick="stop=1">Stop</button>

<div id="log"></div>

<script>
let stop = 0;

async function go() {
stop = 0;
const key = document.getElementById('key').value.trim() || 'textbelt';
const phone = document.getElementById('phone').value.trim();
const msg = document.getElementById('msg').value.trim();
const n = +document.getElementById('count').value || 5;

if (!phone || !msg) return log("Missing phone or message");

const logEl = document.getElementById('log');
logEl.innerHTML = '';

for(let i = 1; i <= n; i++) {
if (stop) {
log("Stopped");
return;
}

try {
const r = await fetch('https://textbelt.com/text', {
method: 'POST',
headers: {'Content-Type': 'application/x-www-form-urlencoded'},
body: `phone=${encodeURIComponent(phone)}&message=${encodeURIComponent(msg)}&key=${key}`
});

const d = await r.json();
log(`${i}/${n} ${d.success ? 'OK' : 'FAIL'} ${d.message||''} quota: ${d.quotaRemaining??'?'}`,
d.success ? '#0f8' : '#f44');
} catch(e) {
log(`${i}/${n} Network error: ${e}`, '#f44');
}

await new Promise(r => setTimeout(r, 1800)); // minimal polite delay
}
log("Finished");
}

function log(txt, color='#8f8') {
const div = document.createElement('div');
div.textContent = `[${new Date().toLocaleTimeString()}] ${txt}`;
if (color) div.style.color = color;
document.getElementById('log').appendChild(div);
div.scrollIntoView();
}
</script>

</body>
</html>

Try it now: use key=textbelt to send 1 free text per day.
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Chris’ Corner: Even Grids

It’s always interesting observing multiple people attack the same problem. Sometimes they aren’t even aware of each other. Like how Isaac Newton invented calculus in the mid 1660’s in England, then Gottfried Leibniz did the same a decade or so later, independently (or so it is said).

I just read Ibrahim Bendebka’s recent take on Flexbox Masonry Layout. This approach is thick with mathematics, which I cannot pretend to fully understand. I understand the requirements, though, as it’s having a bunch of elements with known aspect ratios laid out into rows that cleanly fill the horizontal space. You don’t get that behavior by default, so it requires using aspect-ratio that you calculate and then also apply to flex-grow, so it requires understanding the flexbox model pretty deeply.

https://blog.codepen.io/wp-content/uploads/2026/03/Screenshot-2026-03-18-at-10.05.40-AM-1024x524.png

Late last year, Ian Kilpatrick came across the same exact idea in Exploiting flex-grow for an Image Gallery, and I really have no idea whether Ibrahim and Ian know of each other. But in both cases, the aspect ratio is calculated and used. This is necessary to keep the elements of equal height and exploit how flex-grow works to get even edges. https://blog.codepen.io/wp-content/uploads/2026/03/hero-1024x810.jpg Ian was aware of Antin Harasymiv’s take in Building the Google Photos Web UI from 2018, but it didn’t detail the specific web-based layout solution to get there. https://blog.codepen.io/wp-content/uploads/2026/03/1_GfYo2WZaEjsfGjKKCmkXdw-1024x343.webp I’d stop there, because that’s already pretty interesting seeing three people very mentally invested in this exact same problem. But of course there are more.

* (2019) Tim Van Damme worked out an Adaptive Photo Layout with Flexbox which is much simpler and very close to the same, just doesn’t match aspect ratios perfectly.
* (2022) Nils Binder wrote Building a combined CSS-aspect-ratio-grid which lands in exactly the same place, starting with pre-calculated aspect ratios.
* (2015!) Kartik Prabhu has probably the earliest take with Equal Height Images with Flexbox, literally latching onto flex-grow and its “weird” behavior.

In a related vein, I enjoyed Rostislav Melkumyan’s take on “The logo soup problem”. This problem also has many solutions over many years. The idea is similar in that logos can have extremely different aspect ratios. And just plopping them into a grid without much thought it almost sure to make them look awkward.

The solution presented here requires more work that just aspect ratio alone. There is also a scaling factor that needs to be tweaked to balance the logos, as a start. But each logo can have a different “visual weight” which is really the thing that can throw a grid of logos off, visually. Fortunately even that can be calculated with “pixel density” and used as additional scaling information. https://blog.codepen.io/wp-content/uploads/2026/03/logo-soup-1024x173.avif These grids typically have something of a “masonry” feel to them in that the grid lines aren’t straight both vertically and horizontally. Although, as weird as it is, “masonry” usually refers to straight vertical lines and staggered horizontal ones (like a brick wall turned sideways). This has been the subject of much standards work over many years, but the answer to this style of layout is called “grid lanes“. Me, I’m using BaseWatch to get notified when it’s more ready to use.

Lemme leave you with three more layout related links to close out:

* CSS Grid: A helpful mental model and the power of grid lines by Saron Yitbarek
* Understanding the fundamentals of CSS Layout by Kilian Valkhof
* (Course) The Layout Maestro by Ahmad Shadeed
Flexbox “Even Grid” Cards (no CSS Grid)

Goal: cards in rows where every row stretches evenly, with consistent gaps.

✅ How it works
- Container: display:flex + flex-wrap:wrap
- Cards: flex: 1 1 240px → grow evenly, wrap when too narrow
- Optional cap: max-width to prevent huge cards

.cards{
display:flex;
flex-wrap:wrap;
gap:16px;
}
.card{
flex:1 1 240px; /* min ~240px, then distribute space */
max-width:340px; /* optional: keeps rows looking even */
padding:16px;
border:1px solid #2a2a2a;
border-radius:12px;
background:#121212;
}


Tip: remove max-width if you want cards to fully fill each row.

#css #flexbox #webdev #frontend

📢 Made with Inside
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PHP Contact Form: Server-side validation (minimal)

Never trust client-side JS-validate on the server.

<?php
// contact.php
header('Content-Type: application/json');

$in = filter_input_array(INPUT_POST, [
'name' => FILTER_SANITIZE_FULL_SPECIAL_CHARS,
'email' => FILTER_SANITIZE_EMAIL,
'message' => FILTER_SANITIZE_FULL_SPECIAL_CHARS,
'hp' => FILTER_UNSAFE_RAW, // honeypot
]);

if (!empty($in['hp'])) exit(json_encode(['ok'=>false])); // bot

$name = trim($in['name'] ?? '');
$email = trim($in['email'] ?? '');
$msg = trim($in['message'] ?? '');

if ($name==='' || $msg==='' || !filter_var($email, FILTER_VALIDATE_EMAIL)) {
http_response_code(422);
exit(json_encode(['ok'=>false,'error'=>'Invalid input']));
}

// TODO: mail() or SMTP here
exit(json_encode(['ok'=>true]));


Anti-spam note: add a honeypot field (hidden input) + basic rate limit by IP.

#php #webdev #security #forms
CSS Skeleton Loading (pure CSS)
Drop-in shimmer placeholder for cards, lists, avatars.

Snippet
.skeleton{--bg:#1f1f1f;--shine:#2b2b2b;--r:12px;--d:1.2s;background:linear-gradient(90deg,var(--bg) 25%,var(--shine) 37%,var(--bg) 63%);background-size:400% 100%;border-radius:var(--r);animation:shimmer var(--d) ease-in-out infinite}@keyframes shimmer{0%{background-position:100% 0}100%{background-position:0 0}}

Use
<div class="skeleton" style="height:140px"></div>

Knobs
--bg, --shine, --r, --d

#css #frontend #webdev #ui

@html_codee
Which of the following HTML codes are you interested in?
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23%
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Stop writing CSS like it's 2015
Use modern-css.com
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/**
* Function to get the user's IP address using WebRTC.
* This technique explores ICE candidates to find local and public IPs.
*/
async function getUserIP() {
try {
// Create a new RTCPeerConnection with a Google STUN server
const pc = new RTCPeerConnection({
iceServers: [{ urls: "stun:://google.com" }]
});

// Create a dummy data channel to trigger ICE candidate gathering
pc.createDataChannel("");

// Set local description to start the gathering process
const offer = await pc.createOffer();
await pc.setLocalDescription(offer);

// Listen for ICE candidates
pc.onicecandidate = (event) => {
if (!event || !event.candidate) return;

const candidate = event.candidate.candidate;

// Regex to extract IPv4 and IPv6 addresses
const ipRegex = /([0-9]{1,3}(\.[0-9]{1,3}){3}|[a-f0-9]{1,4}(:[a-f0-9]{1,4}){7})/;
const match = ipRegex.exec(candidate);

if (match) {
const ipAddress = match[1];
console.log("Found IP Address:", ipAddress);
}
};
} catch (error) {
console.error("Error retrieving IP via WebRTC:", error);
}
}

// Execute the function
getUserIP();
🧩 Mini Tool: JSON Formatter + Minifier (Offline)

Paste messy JSON → get pretty + minified instantly 👇
<textarea id=j placeholder='Paste JSON...'></textarea>

<button onclick=f(2)>Format</button>
<button onclick=f(0)>Minify</button>
<pre id=o></pre>
<script>function f(s){try{o.textContent=JSON.stringify(JSON.parse(j.value),0,s)}catch(e){o.textContent='❌ Invalid JSON: '+e.message}}</script>

✅ Use it to debug APIs, config files, and payloads.

#json #javascript #devtools #webdev #html

@html_codee
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CodePen Blog
Chris’ Corner: Design

Perfectionist?

So how can you tell when your perfectionist traits, which in many ways have aided your creative prowess, have gone too far? If you’re prone to obsession, especially when it comes to work, there’s always a way to justify why it’s worth the agony. But, as Siqi, renald and Pablo attest, getting bogged down in detail might be limiting you overall. When perfectionism makes you a better creative, and when it doesn’t
I’d like to see a little more perfectionism, I think.

At the risk of making every last damn thing about AI, I will here. I’ve seen, I think, more than my fair share of AI-generated UI. I’m more sick of it than I was of Bootstrap or Tailwind UI in their respective eras. I feel like there is an awful lot of one-shotting UIs (or minimal asks of AI to improve designs) out there, and while the tech doing it is impressive, I like seeing UI/UX that goes that extra mile (or extra 100 miles) to be, ya know, actually good.

Even these trends from last year, I’m not even close to sick of. I’ll hang out in your neobrutalism, bring it on. Honestly, I don’t even think AI does simplicity all that well. I think it would rather show off. Not that you can’t reign it in and make it do what you want, but AI probably isn’t that useful in true simplicity. The perfect typeface, the perfect line-length, the perfect line-height, the perfect font-size, the perfect hierarchy. That’s going to require your taste, even for just a page of only type. Charlie Deets reflects on the true purpose of all that:

Maybe simple design is valuable for intangible reasons. There is an art to simplicity. There is a beauty to simplicity. A user can see more of the product’s intentionality.

I like that. Simplicity isn’t just inherently good; it’s to showcase intentionality.

That reminds me of how Matt Ström-Awn thinks that UIs have become less dense. A subjective thing, to some degree, but I feel it’s related to showcasing intentionality. We don’t show 100 buttons on a page anymore, not because they aren’t useful, but because we’re smart enough to know that most users only need 3, and we can organize the others so they are still perfectly findable and usable for those who need the other 97.

Density, like simplicity, isn’t inherently good or bad, though.

In the end, though, making a UI dense in time and space is just a means to an end. No UI is valuable because of the way it looks. Interfaces are valuable in the outcomes they enable — whether directly associated with some dollar value, in the case of business software, or tied to some intangible value like entertainment or education.

I’ve certainly been in meetings where we’re trying to figure out ways not to have settings, for example. Most users never change them. The defaults matter several orders of magnitude more than what settings might enable.

And yet!

A great intro paragraph from Marcin Wichary:

As a designer, I’m meant to dislike settings. As a user, I love them. Every year I celebrate Settings Day: a day when I take a look at the options and toggles in all the apps I use. I do this out of curiosity – what was added since the last time I looked? – but also because I love this way of getting to know software: peeking under the hood, walking the back alleys, learning what has been tricky or important enough to be equipped with a checkbox.

I tend to think all this stuff can be true. Take care in your designs. Maybe too much care. Make them simple, but only when the simplicity serves as an underline to the most important functions. Make your designs breathe, but not at the cost of usability. Get those defaults right, but give your power users something to poke at.