3.8. OPT attributes
3.8.7. opt:on
3.8.6. opt:if
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3.8.7. opt:on

The attribute allows to display a tag conditionally, but with keeping the content.

<p><a parse:href="$user.www" opt:on="isAddress($user.www)">{$user.nick}</a></p>

If the $user.www is a valid URL, we will see:

<p><a href="http://www.example.com/">Nickname</a></p>

And if not:

<p>Nickname</p>

Note that such code has no effect when using with instruction tags.

See also:

3.8.7. opt:on
3.8. OPT attributes
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3.8.6. opt:if
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3.8.8. opt:section