Category Archives: Original Content

Using @supports to detect if a browser supports CSS Variables

As tweeted by Ire Aderinokun: @supports (color: var(–)) { /* has support */ } Not too surprising if you’ve used Feature Queries before, but what does surprise me is that you can make it work by only passing the prefix … Continue reading

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Enabling experimental Developer Tools Experiments

Using chrome://flags/ it’s possible to enable “Developer Tools Experiments”. On the most recent Fronteers Conference, Umar Hansa showed that there are even more DevTools Experiments that one can enable: Enable “Developer Tools Experiments” via chrome://flags/ if you haven’t already In … Continue reading

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Emoji Compositions — Create your own emoji by combining existing ones (👱‍♂️ + 🎩 + 🔎 = …)

Last Friday Max Lynch sent out this tweet: I'm still not over Apple killing the best emoji there ever was pic.twitter.com/gVOMhEP3Mn — Max Lynch (@maxlynch) March 15, 2018 Inspired by an idea that first came to my mind after seeing … Continue reading

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Working with symlinked packages in React Native

For an RN app I’m co-developing we have several repos that work together. One of the repos acts a library for other repos to use. During development, in order to test a few things out, we sometimes need to have … Continue reading

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Grid Time (or “Why are clocks in Europe lagging behind by 5 minutes?”)

Yesterday I heard on the news that clocks in Europe have started to lag behind on the official time. The culprit is a fluctuation in Europe’s electricity grid. Clocks, like the ones in your microwave, that are reliant on Grid … Continue reading

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MySQL ST_Distance_Sphere Polyfill

One of the cool things about MySQL 5.7 is the fact that it sports a few spatial convenience functions (since 5.7.6), allowing one to do operations on geometric values. One of those convenience functions is ST_Distance_Sphere, which allows one to … Continue reading

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React’s new context (React 16.3.0)

One of the new things in React 16.3.0 is a new context API: Typically, data in a React application is passed top-down (parent to child) via props. But sometimes it’s useful to pass values through multiple levels of abstraction without … Continue reading

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ESNext: JavaScript “Nullish Coalescing Operator”

One of my favorite ECMAScript Proposals is the “Optional Chaining Operator”. Another proposal that forms great duo with it is the “Nullish Coalescing Operator” (sometimes also referred to as “Nullary Coalescing Operator”). Both proposals still are Stage-1, but don’t let … Continue reading

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JavaScript: What’s new in ECMAScript 2018 (ES2018)?

At the latest TC39 meeting the new features that will make it into the “ECMAScript® 2018 Language Specification” (ES2018) have been selected. All proposals that have reached stage-4 since the consolidation of ES2017 got selected. This post gives one a … Continue reading

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Fixing iTunes Connect “ERROR ITMS-90717” with ImageMagick

When recently publishing an app to the App Store (or at least trying to get it published back then), I couldn’t upload the app via the Application Loader. I got back ERROR ITMS-90717 “Invalid App Store Icon. The App Store … Continue reading

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