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Validating the value
We will use the intl-tel-input plugin for that purpose.
intl-tel-input is a popular j Query plugin for entering and validating international telephone numbers.
Below is some of its advanced features: There is an important note that the input must be revalidated when the user choose another country from the drop list.
Unfortunately, intl-tel-input doesn't provide an event or callback that is executed after choosing a country.
The Markup Validation Service is a validator by the World Wide Web Consortium (W3C) that allows Internet users to check HTML and XHTML documents for well-formed markup.
Markup validation is an important step towards ensuring the technical quality of web pages.
However, it is not a complete measure of web standards conformance. Many major web browsers are often tolerant of certain types of error, and may display a document successfully even if it is not syntactically correct.
Certain other XML documents can also be validated if they refer to an internal or external DTD.
Mark-up validators cannot see the "big picture" on a web page, but they excel at picking up missed closing tags and other technicalities.
DTD-based validators are also limited in their ability to check attribute values according to many specification documents.