「初回起動時または、「/navitime area」や「/navitime lang」と入力して検索エリア、言語(日本語/英語)を選ぶ。「/navitime Shinjuku to Tokyo」や「/navitime Shinjuku to Tokyo arrv 18:00」のように出発駅/到着駅や、希望の出発/到着時刻を入力」
"When submitting a form where a Flatpickr input element has no value, and that element contains the required attribute, the form will allow submission. The expected behavior is that an empty input field with a required attribute will require user input prior to submission via HTML5 form validation."