Table fixup
    Check that missing elements are being created properly
    
    This should be a 100px by 100px blue square:
    1.1. Children of a table-column are treated as if they had display: none.
    
    
    This should be a 100px by 100px blue square:
    1.2. Children of a table-column-group which are not a table-column are treated as if they had display: none.
    
    
    This should be a 100px by 100px blue square:
    2.1. An anonymous table-row box must be generated around each sequence of consecutive children of a table-root box which are not proper table child boxes. 
     
    
    This should read as "1\t2\t3\n   x":
    2.2. An anonymous table-row box must be generated around each sequence of consecutive children of a table-row-grouping box which are not table-row boxes.
    
        1
        
        2
        3
        x
    
    
    This should read as "1\n1\t2":
    2.1. and 2.2. happens before 2.3.
    
        1
        
        1
        2
    
    
    This should read as "1\t2":
    3.2. An anonymous table or inline-table box must be generated around each sequence of consecutive proper table child box which are misparented
    
    
    This should read as "A B":
    1.4. Anonymous inline boxes which contains only white space and are between two immediate siblings *each* of which is a table-non-root element, are treated as if they had display: none.
     A B