"Cannot Read Properties of Undefined": What It Means, and Where the Undefined Came From
TypeError: Cannot read properties of undefined (reading 'name') is the most common line in a browser console, and ...
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debugging
Blog
Tips and notes on reporting better bugs
debugging
Safari 27 Is on Your Users' Phones. What Changed for the Bugs They Report
Safari 27 shipped on 14 September 2026, with iOS 27, iPadOS 27 and macOS 27. Apple’s release notes add a line that...
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debugging
GitHub's Saturday Incident, and the Three Layers Between the Cause and What You Saw
On Saturday 13 September 2026, from 09:16 to 10:44 UTC, GitHub had what its status page classed as a critical inci...
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product updates
Full-Page Screenshots, Badges, and a Side Panel That Follows Your Theme
Four extension releases and a fortnight of work on the site have landed since the last of these posts on 26 August...
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debugging
What Localhost Is, and Why "It Works on Localhost" Is Not the Reassurance It Sounds Like
Localhost is the name your computer uses for itself. Type it into a browser and the request never reaches a networ...
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