HTML select required attributes
Examples
With a drop-down list the required HTML form:
<form action="demo_form.html">
<select required>
<option value="volvo">Volvo</option>
<option value="saab">Saab</option>
<option value="mercedes">Mercedes</option>
<option value="audi">Audi</option>
</select>
<input type="submit">
</form>
<select required>
<option value="volvo">Volvo</option>
<option value="saab">Saab</option>
<option value="mercedes">Mercedes</option>
<option value="audi">Audi</option>
</select>
<input type="submit">
</form>
try it"
Browser Support
Almost all of the major browsers do not support the required properties.
Definition and Usage
required attribute is a Boolean attribute.
required attribute specifies the user before submitting the form you must choose a value.
Differences between HTML 4.01 and HTML5
required attribute is new in HTML5 attributes.
Differences between HTML and XHTML
In XHTML, prohibit attribute minimization, required attributes must be defined as <select required = "required" />.
grammar
<select required>
HTML <select> tag