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diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/HTMLModule/List.php b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/HTMLModule/List.php
new file mode 100644
index 000000000..7a20ff701
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/HTMLModule/List.php
@@ -0,0 +1,51 @@
+<?php
+
+/**
+ * XHTML 1.1 List Module, defines list-oriented elements. Core Module.
+ */
+class HTMLPurifier_HTMLModule_List extends HTMLPurifier_HTMLModule
+{
+    /**
+     * @type string
+     */
+    public $name = 'List';
+
+    // According to the abstract schema, the List content set is a fully formed
+    // one or more expr, but it invariably occurs in an optional declaration
+    // so we're not going to do that subtlety. It might cause trouble
+    // if a user defines "List" and expects that multiple lists are
+    // allowed to be specified, but then again, that's not very intuitive.
+    // Furthermore, the actual XML Schema may disagree. Regardless,
+    // we don't have support for such nested expressions without using
+    // the incredibly inefficient and draconic Custom ChildDef.
+
+    /**
+     * @type array
+     */
+    public $content_sets = array('Flow' => 'List');
+
+    /**
+     * @param HTMLPurifier_Config $config
+     */
+    public function setup($config)
+    {
+        $ol = $this->addElement('ol', 'List', new HTMLPurifier_ChildDef_List(), 'Common');
+        $ul = $this->addElement('ul', 'List', new HTMLPurifier_ChildDef_List(), 'Common');
+        // XXX The wrap attribute is handled by MakeWellFormed.  This is all
+        // quite unsatisfactory, because we generated this
+        // *specifically* for lists, and now a big chunk of the handling
+        // is done properly by the List ChildDef.  So actually, we just
+        // want enough information to make autoclosing work properly,
+        // and then hand off the tricky stuff to the ChildDef.
+        $ol->wrap = 'li';
+        $ul->wrap = 'li';
+        $this->addElement('dl', 'List', 'Required: dt | dd', 'Common');
+
+        $this->addElement('li', false, 'Flow', 'Common');
+
+        $this->addElement('dd', false, 'Flow', 'Common');
+        $this->addElement('dt', false, 'Inline', 'Common');
+    }
+}
+
+// vim: et sw=4 sts=4