Harry Roberts

📣 Today I am incredibly excited to launch SENTINEL, a new service designed to help companies stay on top of site-speed with minimal friction. csswizardry.com/sentinel/

@BenjaminCoe @sentry Messaged! Thanks so much.

👋 hey. our observability products, logs, metrics, tracing, are built with answering high cardinality, user-centric, questions in mind... is this metric, route, etc., slow for bob[at]example.com? We also have session replays, which let you see recordings of full user sessions. Happy to go deeper on any of these topics. Reach out in DM, or in this thread?

Is there anyone at @sentry I can speak to about RUM? Client already has an account so I don’t need a salesperson; I just want a bit of a tutorial, please!

🚨 Warning! `font-family` doesn’t fall back the way you think… csswizardry.com/2026/04/font-f…

@jidefr @webstandardsdev Baffling and unnecessary imo!

@webstandardsdev @csswizardry "you need to understand that position: fixed children will now anchor to the panel, not the viewport." WHAAAAATTTTT

What is CSS containment and how can I use it? @csswizardry covers each contain value, the content and strict shorthands, and content-visibility. Includes a real OpenTable case where containment cut layout time sixfold. #css #performance csswizardry.com/2026/04/what-i…

📖 Some advice for times of uncertainty: When All You Can Do Is All or Nothing, Do Nothing. csswizardry.com/2026/03/when-a…

I built Yoast SEO. I ran my blog on WordPress for years. Then yesterday I moved it to static HTML. Everything that matters, SEO, search, schema, is still there. What I dropped was the overhead. Do you actually need a CMS? For quite some sites: no. joost.blog/do-you-need-a-…

@saltnburnem Happy birthday my man! Have a great birthday weekend

I can’t believe I’m 40.

📽️ Slides from my #WebDayOut talk, ‘Build for the Web, Build on the Web, Build With the Web’. speakerdeck.com/csswizardry/bu…

Can you believe it’s #webdayout week this week? Tomorrow, I’ll be debuting a new talk here in beautiful Brighton. Who’s gonna be here?

@cooperx86 Ahhhh fair! Best of a bad bunch haha.

@csswizardry At my office, within a 15 minute walk it's Starbucks, McDonald's (no), or a Costa machine in a petrol station (even bigger no) 😅 I prefer to make my own at home most of the time.

@StarbucksUK Can you clarify the best way to have sugar added to a drink ordered via app and picked up at drive thru? I know you can just ask at the window, but it seems odd you can customise everything *except* sugar in the app before that, and it wastes the barista's time.

@sergical It makes sense to me: more/deliberate effort to permanently turn the alarm off than a simple tap.

which PM at Apple decided that Alarm’s Snooze should be a tap and Stop should be a slide, you ngmi

@maxvoltar It’s pretty exuberant! I like it but it’s not like many pens I’ve used before. Bought it specifically to write a friend’s birthday card.

@csswizardry Let me know what you think!

New favorite pen: Uni-Ball Air (previously: Steadler .8mm pigment liner)

@samccone A moment for Molly ❤️

If you know you KNOW

Your phone contacts isn’t your data, it’s lots and lots and lots of other peoples’ data. I’m stunned that this feature was ever implemented anywhere. Giving everyone else’s phone numbers to a third party without their consent?! 🤯

@namboozle Times I have written this comment: 0 Times I have read this comment: 27718

@csswizardry This is the sort of stuff I find when I inherit projects 😂

Oh boy…

@rileycx @danmall Perhaps you wouldn’t! But the point still stands.

@csswizardry @danmall Then why would you spend your time helping the local restaurant?

Don’t ask your prospects what their budget is. Here’s why. There’s a concept in pricing psychology called a “price anchor.” The first number someone hears becomes the reference point for every number after it. For example: If I say “5” and then say “10,” you think 10 as compared to 5. Twice as much as 5. But if I say “20” and then say “10,” you think of 10 different. It‘s half as much as 20. Same number (10). Two different thoughts about it. When you ask a client for their budget, their number becomes the anchor. Now every price you share gets compared to it. Since your price will almost always be higher, they’ll think: ↳ “That‘s 10% more than we planned,” or ↳ ”That’s double what we expected,” or ↳ ”That’s way over budget.” None of those thoughts help you. So, forget all the negotiation advice you’ve heard about “letting the client go first.” If you care about how your price is perceived, make sure you’re the first to say a number.