Discourages using deprecated tags in themes. Deprecated tags have their own unique implementation within this check. For example the
include tag is deprecated but is still used in themes. This check looks for the
include tag and provides a message that it's deprecated.
The following examples contain code snippets that either fail or pass this check:
Disabling this checkAnchor link to section titled "Disabling this check"
Disabling this check isn't recommended.