The Summary multiline textarea will grow as you type. This avoids the need for an internal scrollbar, which tends to be difficult to use on a mobile device. This sort of input is especially useful when you need to gather more information than will generally fit in a singleline input element.
The following markup and Razor syntax create the Summary element:
<li data-role="fieldcontain">
@Html.LabelFor(model => model.Summary)
@Html.EditorFor(model => model.Summary)
@Html.ValidationMessageFor(model => model.Summary)
</li>
The code from the TahDoList Model marks this element as a MultilineText element:
[DataType(DataType.MultilineText)]
public string Summary { get; set; }
This results in a Summary textarea that resembles the following image:
