You are developing a customer web form that includes the following HTML.

<input id=-txtValue-/>

You need to change the HTML markup so that customers can enter only a valid three-letter country code.

Which HTML should you use?

A.<input id=-txtValue- type=-code- />

B.<input id=-txtValue- type=-text- pattern=- [A-Za-z]{3}- />

C.<input id=-txtValue- type=-text- required=-required-/>

D.<input id=-txtValue- type=-country- />

Explanation:

HTML <input> pattern Attribute

The pattern attribute specifies a regular expression that the <input> elements value is checked against.

Example

An HTML form with an input field that can contain only three letters (no numbers or special characters):

<form action=”demo_form.asp”>

Country code:

<input type=”text” name=”country_code”

pattern=”[A-Za-z]{3}” title=”Three letter country code”>

<input type=”submit”>

</form>

Reference: HTML

<

input

>

pattern Attribute

http://www.w3schools.com/tags/att_input_pattern.asp