A template is a document you can use to create multiple pages that
share the same layout. When you create a template, you can indicate
which elements of a page should remain constant (noneditable, or
locked) in documents based on that template, and which elements can
You can modify a template even after you've created documents based
on it. When you modify a template, the locked (noneditable) regions
in documents that are based on the template are updated to match
the changes to the template.
Templates are particularly useful in a collaborative environment
in which a designer controls the page layouts, and other people add
content to the pages but aren't allowed to change the layout.
Important Notes and Considerations
If you open a template file, you can edit everything in that file,
whether it's marked as editable or locked. If you open a document
that is based on a template file, you can edit only the regions that
are marked as editable. So the terms editable and locked refer to
whether a region is editable in a document based on a template, not
to whether the region is editable in the template file itself.
Using a template may limit your later changes to design and layout.
If you intend to make major layout changes to your pages later, you
may want to use library items instead of templates.
Utilizing CSS or Behaviors usually requires that script or link
information be stored in the HEAD section of the page which is locked
in a template. Therefore, if you wish to utilize these things, you
must do so in the template. (Certain behaviors in the BODY section
may carry over if you apply a Template to an existing HTML page with
the behavior set.)