If your intention is to make your template in a way that you can “turn off” some tags or blocks of code, you could use HTML comments to do so, then the template user will be able to comment or uncomment those blocks to “turn then on or off”
For example:
<!-- Left Column, uncomment for use -->
<!-- <div id="col"... [the rest of the code] ... -->
And the when a person wants to use that block they remove the comments from it and start using it.
You can read more about HTML comments here:
http://www.w3schools.com/tags/tag_comment.asp
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solved HTML True or false in editor? [closed]