36 out of 36 is not 100%
The formula in every textbook says a rate can be negative, that 19 of 20 is 105%, and that a perfect score carries no doubt at all. At 16 trials its real coverage drops to 3.9%. The fix is one line.
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What quietly breaks when software ships faster than anybody can check it, how to catch it yourself, and what we have measured about our own tool.
Which accessibility issues can be automated?
An automated checker ships around a hundred rules. Counted against the spec they land on 29 success criteria, and 29 of those rules cover one criterion between them.
You are not your user, in five numbers
Ten thousand simulated users from a research dataset. 27% write code, 12% are digital natives, and only one in five arrives trusting your software.
How to tell a website was built by AI
There is a house style now, and once you have seen it you cannot stop seeing it. Seven tells, in the order you meet them. Every one of them is something a person can see, read or press, with no developer tools at all.