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Using Noscript and Optgroup tag in HTML 5
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HTML 5 <noscirpt>
The <noscipt> tag is used for providing
alternative content for browsers that don't support javascript or other
scripting languages. It is used in conjunction with the <script> tag.
Example
<!DOCTYPE
HTML>
<html>
<body>
<script
type="text/javascript">
document.write("This is the home page!")
</script>
<noscript>Your
browser does not support JavaScript!</noscript>
</body>
</html>
Output 
HTML 5 <optgroup> tag
The <optgroup> tag is used for making a group
of related options within your select list. This makes easier for the users to
comprehend the options when looking for a large list.
Example
<!DOCTYPE
HTML>
<html>
<body>
<select>
<optgroup
label="India">
<option
value ="new delhi">New Delhi</option>
<option
value ="mumbai">Mumbai</option>
</optgroup>
<optgroup
label="Australia">
<option
value ="sydney">Sydney</option>
<option
value ="melbourne">Melbourne</option>
</optgroup>
<optgroup
label="New Zealand">
<option
value ="cromwell">Cromwell</option>
<option
value ="queenstown">Queenstown</option>
</optgroup>
</select>
</body>
</html>
Output 
Note: There are two attributes for
the optgroup element: Label which defines the label for the option group and
Disabled to disable the options in that option-group.
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