Stripping the dots from an email address can merge two different people
Only Gmail's consumer domain and Proton document dots as ignorable. On Google Workspace dots change the address, so two...
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How Cangjie turns a Chinese character into five keystrokes
The 24 Cangjie keys are abstract shapes rather than the characters printed on them, and the five-code limit is derived f...
The payment QR on the counter is a line of text you can read
ASEAN merchant payment codes all use one published format: a flat string of tag, length and value. Decoding a real paylo...
No ASEAN country has opened the whole 6 GHz band, and China opened none of it
Six ASEAN countries released the bottom 500 MHz of the 6 GHz band and stopped; the United States released all 1,200. Onl...
127.0.0.1 is one of sixteen million loopback addresses
IPv4 reserved the whole of 127.0.0.0/8 for loopback, and the RFC that did it never names 127.0.0.1. Whether the other 16...
WCAG asks for 24 pixels, not the 44 everyone quotes
The 44-pixel tap target is quoted everywhere as the accessibility requirement. It is WCAG's Level AAA figure. The criter...
Sixteen different base64 strings decode to the same byte
Base64 leaves four bits free when it encodes a single byte, and RFC 4648 binds encoders with MUST while granting decoder...
Z and +00:00 stopped being the same thing in 2024
RFC 9557 moved Z across to mean the instant is known and the local offset is not, while +00:00 kept its older meaning. T...
Valid JSON is not one thing, and three runtimes prove it
A fourteen-byte document containing a lone surrogate escape parses in Node, parses in Python and is refused by PHP — all...
The privacy header thousands of sites copied now guards something else
Permissions-Policy: interest-cohort=() was added in 2021 to opt out of FLoC. FLoC was cancelled, and Chromium repointed...
WebAuthn tells your server to ignore the bit that proves two factors
One flag distinguishes a passkey login that used only the device from one that also took a PIN or fingerprint. The spec...
One embedding model, four different maximum lengths
The most downloaded sentence-embedding model ships four config files declaring 128, 256, 512 and 512 as its maximum inpu...
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