Template Attribute Language is a historical template created in 2007.

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Example code from Wikipedia:

<html metal:define-macro="icing">
 ...
 <metal:myslot define-slot="optional-form">
 ...
 </html>
 
 <html metal:use-macro="templates/page/macros/icing">
 <form metal:fill-slot="optional-form" action="."
         tal:attributes="action context/designator">
 ...
 </form>
 </html>
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Last updated February 11th, 2019