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A <code>combobox</code> functionally combines a named input field with the ability to assist value selection via a supplementary popup element.

A <code>combobox</code> input MAY be either a single-line text field that supports editing and typing or an element that only displays the current value of the <code>combobox</code>.

If an element with role <code>combobox</code> supports text input, authors MUST ensure that the text input has <pref>aria-multiline</pref> set to <code>false</code>.

If the <code>combobox</code> supports text input and provides autocompletion behavior as described in <pref>aria-autocomplete</pref>, authors MUST set <pref>aria-autocomplete</pref> on the <code>combobox</code> element to the value that corresponds to the provided behavior.

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