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It would be nice if CPTextField supported the (non-standard) HTML autocomplete and spellcheck attributes, so one could prevent these behaviors in browsers that allow them to be disabled.
Preventing the autocomplete behavior is useful if you don't want the contents of the field to be added to the autocomplete list, for instance if it is something you'd like to keep private, like a credit card number. Disabling the spellcheck feature is useful if the field contents are not words.
Milestone: 1.0. Labels: #accepted, #needs-patch, AppKit, feature. What's next? This issue needs a volunteer to write and submit code to address it.