--- /dev/null
+WhiteList
+=========
+
+This White Listing helper will html encode all tags and strip all attributes that aren't specifically allowed.
+It also strips href/src tags with invalid protocols, like javascript: especially. It does its best to counter any
+tricks that hackers may use, like throwing in unicode/ascii/hex values to get past the javascript: filters. Check out
+the extensive test suite.
+
+ <%= white_list @article.body %>
+
+You can add or remove tags/attributes if you want to customize it a bit.
+
+Add table tags
+
+ WhiteListHelper.tags.merge %w(table td th)
+
+Remove tags
+
+ WhiteListHelper.tags.delete 'div'
+
+Change allowed attributes
+
+ WhiteListHelper.attributes.merge %w(id class style)
+
+white_list accepts a block for custom tag escaping. Shown below is the default block that white_list uses if none is given.
+The block is called for all bad tags, and every text node. node is an instance of HTML::Node (either HTML::Tag or HTML::Text).
+bad is nil for text nodes inside good tags, or is the tag name of the bad tag.
+
+ <%= white_list(@article.body) { |node, bad| white_listed_bad_tags.include?(bad) ? nil : node.to_s.gsub(/</, '<') } %>
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