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It seems to me that WordPress have 7 major release since WP 3.3. Is
this rule still valid?<br>
> Themes <b>must not</b> provide backward compatibility for
out-of-date WordPress versions (more than two prior major WordPress
versions – currently, that means versions prior to WordPress 3.3),
including using <tt>function_exists()</tt> conditional wrappers for
current WordPress functions.<br>
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OR it should be prior to WordPress 3.8?<br>
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