Simon Hearne
@simonhearne
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Solutions Architect @elastic. #WebPerf, #DataViz, #UX, #O11y & #A11y. Co-organiser of @ldnwebperf. #aphantasic. He / Him
England, United Kingdom
Joined December 2008
RT @davidfowl: Does anyone *really* understand CORS? The amount of "allow everything" configuration I see in practice is concerning.
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RT @rustybrick: Google to drop the page experience report, mobile usability report and the mobile-friendly test (and API) in the coming mon….
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Three DIY lessons after electrocuting myself twice today:.1. Don’t assume that a lighting circuit is dead when the switch is off.2. Don’t assume that your live circuit tester works.3. Don’t assume all upstairs lights are on the ‘upstairs lights’ circuit.⚡️⚡️⚡️😵.
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Is that time of the year! 5/5 household members struck down by the lurgy. Sick three-month-olds don’t need much sleep apparently.
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The ridiculous amount of crypto spam on bird site makes Mastodon 100% nicer.
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Woke up today to no network at home, it turns out the battery in the UPS has died again. Why it fails closed I don’t know, but I now realise that we have lost power due to the UPS failing more often than due to the power supply failing. Anyone want an old UPS?.
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Measuring responsiveness on the web… is hard. mmocny demonstrates what impacts #INP and how modern #JavaScript APIs can be used to improve #WebPerf.
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There are some delays of course, it takes a while for new DNS records to propagate and there will potentially be issues with Let's Encrypt validating the host cert once Cloudflare SSL is enabled. I'll find out in three months 😅.
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It's surprisingly easy (and cheap) to run your own Mastodon server:. 1: register a domain. I used Cloudflare to register 2: install mastodon - I used the one-click digital ocean app at ~$12 per month [1]. 3: add DNS A record for…
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RT @adhdjesse: If you sent me a message and I never responded,. Just know that I stress about it every single day because I haven’t figured….
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RT @vitalyf: How do you choose the right Cache-Control header? @simonhearne has got your back with a flowchart and Caching Header Beset Pra….
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Reading this tweet back makes me realise how obtuse web tech can be. How would you explain this to a non-techy?.
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This is the first "proper" use of the Navigation API I've seen in the wild. Why is it so important? Any third-party app (annotations, monitoring, error logging etc.) are generally guessing if the visitor has navigated to a new SPA view. This API takes away the guesswork.
@hypothes_is has finally gained support for web pages and applications that do client-side navigation. We use the new Navigation API ( when available, as it allows us to know when an SPA navigation starts and finishes.
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We're reading Alice in Quantumland and Quantum: A Guide for the Perplexed, but there is always a step from "we get it" to "say what?" that we're struggling with.
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My eldest son (8yo) has challenged me to teach him quantum mechanics. We've watched literal hours of YouTube videos and are no more enlightened than the original double-slit explanation I just about remembered from 20 years ago. Any pointers for accessible resources for kids?.
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