Set the attributes for a HTML tag of the specified node by modifying the provided map. <p> This allows to change or even remove default attributes. With great power comes great responsibility. <p> The attribute key and values will be escaped (preserving character entities), so don't escape them here, otherwise they will be double-escaped. <p> This method may be called multiple times for the same node, if the node is rendered using multiple nested tags (e.g. code blocks).
Extension point for adding/changing attributes on HTML tags for a node.