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How does form autofill work in modern web browsers? Which are the most common techniques used in browsers that implement automatic form filling?
-- EDIT --
The question is not about autocomplete, is about form autofilling, which cares not only about the previously inputted values but also considers the meaning and structure of the field to be completed. Google Chrome implementation, for example, tries to parse the inputted fields to guess their type and structure. Or at least is that what I understood from the code linked above.
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Autocomplete is a feature within Google Search that makes it faster to complete searches that you start to type. Our automated systems generate predictions that help people save time by allowing them to quickly complete the search they already intended to do.
Google Chrome Autofill Click Settings and then scroll down the page and click the link “Show advanced settings…” Scroll down until you see the Passwords and Forms section. Click the checkbox by "Enable Autofill to fill out web forms in a single click". To add information click "Manage Autofill settings".
Click on the Address Field, which will open on the right side of the screen its own settings. Once on it, you'll scroll down until Advanced options. There you'll see Google Autocomplete. Switch it On.
Take a look over at this answer by kmote.
Highlight is that the browser looks at the field's name tag and makes an educated guess at what sort of data would go there (regex matching is a good naive way to do this). Chrome is working to get some sort of standardization so that this isn't quite as hit-or-miss.
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