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check_css = lambda { |env| | |
node = env[:node] | |
node_name = env[:node_name] | |
# Don't continue if this node is already whitelisted or is not an element. | |
return if env[:is_whitelisted] || !node.element? | |
parent = node.parent | |
return unless node_name == 'style' || node['style'] | |
if node_name == 'style' | |
unless good_css? node.content | |
node.unlink |