Autocomplete textbox should have type=search to comply with the accessibility guideline [1.3.5 identify input purpose], but i do not see any way to do so.
Typically, role="combobox" complies with accessibility compliance no matter what the type of input is. And currently, type=text is a valid option. Even if you change the type to search, the role attribute takes precedence to comply with accessibility guidelines.
Regards,
Ianko
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