我正在使用以下CSS绝招：

  input[type="date"]:before {

    content: attr(placeholder) !important;

    color: #aaa;

    margin-right: 0.5em;

  }

  input[type="date"]:focus:before,

  input[type="date"]:valid:before {

    content: "";

  }


<input type="date" placeholder="Choose a Date" />