diff --git a/content/html/content/src/nsGenericHTMLElement.cpp b/content/html/content/src/nsGenericHTMLElement.cpp
index 3b60b7375477..fd349a83e7f2 100644
--- a/content/html/content/src/nsGenericHTMLElement.cpp
+++ b/content/html/content/src/nsGenericHTMLElement.cpp
@@ -379,8 +379,18 @@ static bool
IsOffsetParent(nsIFrame* aFrame)
{
nsIAtom* frameType = aFrame->GetType();
- return (IS_TABLE_CELL(frameType) ||
- frameType == nsGkAtoms::tableFrame);
+
+ if (IS_TABLE_CELL(frameType) || frameType == nsGkAtoms::tableFrame) {
+ // Per the IDL for Element, only td, th, and table are acceptable offsetParents
+ // apart from body or positioned elements; we need to check the content type as
+ // well as the frame type so we ignore anonymous tables created by an element
+ // with display: table-cell with no actual table
+ nsIContent* content = aFrame->GetContent();
+
+ return content->IsHTML(nsGkAtoms::table) || content->IsHTML(nsGkAtoms::td)
+ || content->IsHTML(nsGkAtoms::th);
+ }
+ return false;
}
Element*
diff --git a/content/html/content/test/Makefile.in b/content/html/content/test/Makefile.in
index 4b3ad3e7fb58..ad67d2e9f68d 100644
--- a/content/html/content/test/Makefile.in
+++ b/content/html/content/test/Makefile.in
@@ -270,6 +270,7 @@ MOCHITEST_FILES = \
test_bug786564.html \
test_bug797113.html \
test_bug787134.html \
+ test_bug803677.html \
test_iframe_sandbox_inheritance.html \
file_iframe_sandbox_a_if1.html \
file_iframe_sandbox_a_if2.html \
diff --git a/content/html/content/test/test_bug803677.html b/content/html/content/test/test_bug803677.html
new file mode 100644
index 000000000000..fd754ba001bd
--- /dev/null
+++ b/content/html/content/test/test_bug803677.html
@@ -0,0 +1,50 @@
+
+
+
+
+
+ Test for Bug 803677
+
+
+
+
+
+
+
+Mozilla Bug 803677
+
+
+
1
+
2
+
3
+
4
+
7
+
8
+
9
+
+
+
+
+