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Web developers unfortunately don't spend a couple extra minutes marking up their forms correctly: html.spec.whatwg.org/multipage/form Chrome auto-completion largely relies on telemetry to gather data about forms across sites and implement heuristics to cope with them. It's pretty awful.
The web site is likely using an id/name for the input field and/or form that's associated with passwords. They might explicitly set it as a password input. In my opinion, Chrome shouldn't have these heuristics and this should be for web sites to set up based on web standards...
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