AutoFormat.RemoveEmpty.Predicate
TYPE: hash
VERSION: 4.7.0
DEFAULT: array('colgroup' => array(), 'th' => array(), 'td' => array(), 'iframe' => array('src'))
--DESCRIPTION--
<p>
Given that an element has no contents, it will be removed by default, unless
this predicate dictates otherwise. The predicate can either be an associative
map from tag name to list of attributes that must be present for the element
to be considered preserved: thus, the default always preserves <code>colgroup</code>,
<code>th</code> and <code>td</code>, and also <code>iframe</code> if it
has a <code>src</code>.
</p>
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