We have one input type named tel. further we can understand from following example.
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<html><!--root tag-->
<head><!--used for meta tag-->
<title><!--title tag-->
form with input type tel
</title>
</head>
<body><!--is a container-->
form <br>
<form><!--opening of form tag-->
enter telphone number in 123-456-7890 pattern
<input type="tel" pattern="[0-9]{3}-[0-9]{3}-[0-9]{4}" placeholder="123-456-7890" required>
<!--accepts telephone number. pattern is the pre-definedd format. If we donot follow, it will not accept-->
</form>
</body>
</html>
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