/// <summary>
        /// Makes block boxes be among only block boxes.
        /// Inline boxes should live in a pool of Inline boxes only.
        /// </summary>
        /// <param name="startBox"></param>
        private void BlockCorrection(CssBox startBox)
        {
            bool inlinesonly = startBox.ContainsInlinesOnly();

            if (!inlinesonly)
            {
                List <List <CssBox> > inlinegroups = BlockCorrection_GetInlineGroups(startBox);

                foreach (List <CssBox> group in inlinegroups)
                {
                    if (group.Count == 0)
                    {
                        continue;
                    }

                    if (group.Count == 1 && group[0] is CssAnonymousSpaceBox)
                    {
                        CssAnonymousSpaceBlockBox sbox = new CssAnonymousSpaceBlockBox(startBox, group[0]);

                        group[0].ParentBox = sbox;
                    }
                    else
                    {
                        CssAnonymousBlockBox newbox = new CssAnonymousBlockBox(startBox, group[0]);

                        foreach (CssBox inline in group)
                        {
                            inline.ParentBox = newbox;
                        }
                    }
                }
            }

            foreach (CssBox b in startBox.Boxes)
            {
                BlockCorrection(b);
            }
        }
        /// <summary>
        /// Makes block boxes be among only block boxes. 
        /// Inline boxes should live in a pool of Inline boxes only.
        /// </summary>
        /// <param name="startBox"></param>
        private void BlockCorrection(CssBox startBox)
        {
            bool inlinesonly = startBox.ContainsInlinesOnly();

            if (!inlinesonly)
            {

                List<List<CssBox>> inlinegroups = BlockCorrection_GetInlineGroups(startBox);

                foreach (List<CssBox> group in inlinegroups)
                {
                    if (group.Count == 0) continue;

                    if (group.Count == 1 && group[0] is CssAnonymousSpaceBox)
                    {
                        CssAnonymousSpaceBlockBox sbox = new CssAnonymousSpaceBlockBox(startBox, group[0]);

                        group[0].ParentBox = sbox;
                    }
                    else
                    {
                        CssAnonymousBlockBox newbox = new CssAnonymousBlockBox(startBox, group[0]);

                        foreach (CssBox inline in group)
                        {
                            inline.ParentBox = newbox;
                        }
                    }
                }
            }

            foreach (CssBox b in startBox.Boxes)
            {
                BlockCorrection(b);
            }
        }