diff --git a/layout/html/tests/table/bugs/bug7121-1.html b/layout/html/tests/table/bugs/bug7121-1.html
new file mode 100644
index 00000000000..2187b7b1a72
--- /dev/null
+++ b/layout/html/tests/table/bugs/bug7121-1.html
@@ -0,0 +1,110 @@
+
+
+
+
+In this table (modeled after mozilla.org template) the cells in
+column two are requesting colspans of (2,3,2,6) respectively. Notice
+that they all want to span more than one column (which means, in the case of
+this table, all rows are requesting to span more columns than the
+number of 'real' <TD> in any single rows [i.e., all rows in the top
+table want to
+span 9 cells, but the maximum number of <TD> in any row is
+8].
This condition leads to the 'white gap' (in builds of 5.0 for jun04 and before).
+
+
+
+
+
+| 1 |
+2 |
+4 |
+5 |
+6 |
+7 |
+8 |
+9 |
+
+
+
+
+| 1 |
+2 |
+5 |
+6 |
+7 |
+8 |
+9 |
+
+
+
+
+| 1 |
+2 |
+4 |
+5 |
+6 |
+8 |
+9 |
+
+
+
+
+| 1 |
+7 |
+8 |
+
+
+
+
+This is the same table as above, but instead the cells in column two
+are requesting colspans of (1,2,1,5) respectively (i.e., excess requests have
+been 'normalized' away). There is no more 'white gap'.
+
+
+
+
+
+| 1 |
+2 |
+3 |
+4 |
+5 |
+6 |
+7 |
+8 |
+
+
+
+
+| 1 |
+2 |
+4 |
+5 |
+6 |
+7 |
+8 |
+
+
+
+
+| 1 |
+2 |
+3 |
+4 |
+5 |
+7 |
+8 |
+
+
+
+
+| 1 |
+6 |
+7 |
+
+
+
+
+
+
+
diff --git a/layout/html/tests/table/bugs/bug7121-2.html b/layout/html/tests/table/bugs/bug7121-2.html
new file mode 100644
index 00000000000..e3136252a8a
--- /dev/null
+++ b/layout/html/tests/table/bugs/bug7121-2.html
@@ -0,0 +1,15 @@
+
+
+
+
+ |
+
+
+ Copyright © 1998-1999 The Mozilla Organization.
+
+ |
+
+
+ |
+
+
diff --git a/layout/html/tests/table/bugs/file_list.txt b/layout/html/tests/table/bugs/file_list.txt
index 52b728c5521..4503d6fdc45 100644
--- a/layout/html/tests/table/bugs/file_list.txt
+++ b/layout/html/tests/table/bugs/file_list.txt
@@ -95,6 +95,8 @@ file:///s:/mozilla/layout/html/tests/table/bugs/bug647.html
file:///s:/mozilla/layout/html/tests/table/bugs/bug650.html
file:///s:/mozilla/layout/html/tests/table/bugs/bug6933.html
file:///s:/mozilla/layout/html/tests/table/bugs/bug709.html
+file:///s:/mozilla/layout/html/tests/table/bugs/bug7121-1.html
+file:///s:/mozilla/layout/html/tests/table/bugs/bug7121-2.html
file:///s:/mozilla/layout/html/tests/table/bugs/bug7243.html
file:///s:/mozilla/layout/html/tests/table/bugs/bug727.html
file:///s:/mozilla/layout/html/tests/table/bugs/bug7342.html