It’s not easy to explain, but you can see it like this: I have an textarea. Example: Syntax: It is used to return the maxLength property: textareaObject.maxLength This is a long word: I have an textarea. The limit is the 'rows'-attribute of the textarea. Number of lines<= 4. Here are the other attributes of The text area tag helper was able to generate name and _id_ properties based on the name of the property specified in asp-for . And here's a simplified example from there: Autosize textarea