If you want to use unlimited number of characters in your form then <textarea> is going to easy your life. According to w3school The <textarea> tag defines a multi-line text input control and hold unlimited number of characters.
A simple example :
<textarea rows="14" cols="30" ></textarea>
How to use in language like PHP?
Its simple just check out the example below...
Whats new in HTML 5
<form action="" method="post">
<textarea name="msg" rows="14" cols="30" ></textarea>
<input type="submit" name="submit" value="Go" />
- Specifies that a text area should automatically get focus when the page
-Specifies a short hint that describes the expected value of a text area.
-Specifies that a text area is required/must be filled out.
If you have any suggestion or something to add please comment so I can implement in my blog.