--- a/webengine/osswebengine/WebCore/rendering/RenderBox.cpp	Tue Aug 31 16:17:46 2010 +0300
+++ b/webengine/osswebengine/WebCore/rendering/RenderBox.cpp	Wed Sep 01 12:28:30 2010 +0100
@@ -1449,8 +1449,18 @@
                 int newHeight = block->calcContentBoxHeight(block->contentHeight());
                 block->setHeight(oldHeight);
                 return calcContentBoxHeight(height.calcValue(newHeight));
+            }            
+            // As per CSS2, percentage based height computes to 'auto', if the height of the containing block
+            // is not specified explicitly, and this element is not absolutely positioned.
+            // In standard mode, we try to follow this rule.
+            if (!style()->htmlHacks() && cb->style()->height().isAuto() && !isPositioned() && !cb->isRenderView() && !cb->isTableCell()) {
+                IntSize size = intrinsicSize();
+                // Try to keep aspect ratio.
+                int h = size.width() ? calcReplacedWidth() * size.height() / size.width() : size.height();
+                if (h > 0)
+                    return calcContentBoxHeight(h);
             }
-            
+
             int availableHeight = isPositioned() ? containingBlockHeightForPositioned(cb) : cb->availableHeight();
 
             // It is necessary to use the border-box to match WinIE's broken