diff --git a/mozilla/layout/html/tests/block/bugs/63785.html b/mozilla/layout/html/tests/block/bugs/63785.html
new file mode 100644
index 00000000000..741dd8880cd
--- /dev/null
+++ b/mozilla/layout/html/tests/block/bugs/63785.html
@@ -0,0 +1,19 @@
+
+
+Bug 63785
+
+
+
+
+
+
+
+ Paragraph one
+ Paragraph two (1em margin between the two paragraphs)
+
+ |
+
+
+
+
+
diff --git a/mozilla/layout/html/tests/block/bugs/file_list.txt b/mozilla/layout/html/tests/block/bugs/file_list.txt
index 5bc4477a65a..6c2e30097c2 100644
--- a/mozilla/layout/html/tests/block/bugs/file_list.txt
+++ b/mozilla/layout/html/tests/block/bugs/file_list.txt
@@ -151,3 +151,4 @@ file:///s:/mozilla/layout/html/tests/block/bugs/56265.html
file:///s:/mozilla/layout/html/tests/block/bugs/56563_1.html
file:///s:/mozilla/layout/html/tests/block/bugs/57554.html
file:///s:/mozilla/layout/html/tests/block/bugs/54005.html
+file:///s:/mozilla/layout/html/tests/block/bugs/63785.html