Many DRT tests dump render tree, when they apparently shouldn't. Examples are:
  fast/parser/entities-in-attributes-expected.txt
  fast/parser/external-entities-in-xslt-expected.txt
  fast/parser/xslt-with-html-expected.txt

Typical result is
@@ -1 +1,7 @@
-PASS
+layer at (0,0) size 800x600
+ RenderView at (0,0) size 800x600
+layer at (0,0) size 800x600
+ RenderBlock {HTML} at (0,0) size 800x600
+ RenderBody {BODY} at (8,8) size 784x584
+ RenderInline {ROOT} at (0,0) size 0x0
+ RenderText {#text} at (0,0) size 0x0

There must be a setting we don't account for.