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.

This should read as "1\n1\t2":

2.1. and 2.2. happens before 2.3.

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.