<input> pattern Attribute
This attributes specifies a regular expression <input> element's value checked against this specific regular expression.
Note: This attribute works with in these input types: text, search, url, tel, email, and password.
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Enter Country code: <input type="text" name="coun_code" pattern="[A-Za-z]{4}" title="four letter country code" />
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<input> placeholder Attribute
This attributes define the short hint about the expected input value field.
This enter hint always display in the input field when it is empty. and it get disappear after the insert cursor or get focus.
Note: This attribute works with these input types: text, search, url, tel, email, and password.
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<!DOCTYPE html>
<html>
<body>
<form action="default.aspx">
<input type="text" name="fname" placeholder=" Enter First name" /><br />
<input type="text" name="lname" placeholder="Enter Last name" /><br />
<input type="submit" value="Submit" />
</form>
</body>
</html>
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Output
<input> required Attribute
It is a Boolean attribute. And it is specified that input field is necessary to filled before the submitting the form.
Note: This attribute works with these input types: text, search, url, tel, email, checkbox, radio, and file. password, date pickers, number.
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<!DOCTYPE html>
<html>
<body>
<form action="demo_form.asp">
Enter Username: <input type="text" name="uname" required="required" />
<input type="submit" />
</form>
</body>
</html>
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Output
Further Readings
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