I've been having a lot of issues figuring out how to get rid of all browser functionality associated with <input type="date" />
but keeping it as that type in order to trigger appropriate software keyboards on mobile.
So far:
::-webkit-datetime-edit-fields-wrapper { display: none !important; }
::-webkit-datetime-edit-text { display: none !important; }
::-webkit-datetime-edit-month-field { display: none !important; }
::-webkit-datetime-edit-day-field { display: none !important; }
::-webkit-datetime-edit-year-field { display: none !important; }
::-webkit-inner-spin-button { display: none !important; }
::-webkit-calendar-picker-indicator { display: none !important; }
These seem to be all values associated to this input type, but adding display none of them basically renders input unusable, i.e. no text or placeholders are visible.