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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="country"/>
B. <input id="txtValue" type="text" required="xxx"/>
C. <input id="txtVa!ue" type="text" pattern-" [A-Za-z] {3} "/>
D. <input id="txtValuen type="code" pattern"="country"/>
Correct Answer: C
Explanation/Reference:
HTML <input> pattern Attribute
The pattern attribute specifies a regular expression that the <input> element’s 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
