multiline property for, whether to allow multiple lines of input, will be multiline property is set to true, in the text box can be line feed, but also can be combined with the scrollbars attribute, set the style of its scrollbars. Note that for text controls, only the multiline property is true to make the scrollbars property scrollbor work, and for text boxes with multiple lines, if you set the scrollbars property to TRUE, multiline must be TRUE