Support for parsing all CSS and producing one CSS file

test/data/expected/todomvc_listorder_shadowdom_test.html.txt

Index: test/data/expected/todomvc_listorder_shadowdom_test.html.txt
diff --git a/test/data/expected/todomvc_listorder_shadowdom_test.html.txt b/test/data/expected/todomvc_listorder_shadowdom_test.html.txt
index ef7fa1b567f13ab930ed4dfa3f025f2fbe7c11d5..cc0fc3525a79521a05865bdb56dfe5e05af25251 100644
--- a/test/data/expected/todomvc_listorder_shadowdom_test.html.txt
+++ b/test/data/expected/todomvc_listorder_shadowdom_test.html.txt
@@ -142,7 +142,6 @@ layer at (115,159) size 65x41
         text run at (25,0) width 16: "\x{BB}"
 layer at (126,212) size 548x59
   RenderBlock (relative positioned) {DIV} at (0,0) size 548x59 [border: none (1px dotted #CCCCCC) none]
-    RenderText {#text} at (0,0) size 0x0
     RenderInline {X-EDITABLE-LABEL} at (0,0) size 256x27
       RenderText {#text} at (0,0) size 0x0
       RenderText {#text} at (0,0) size 0x0
@@ -161,7 +160,6 @@ layer at (126,212) size 40x58
         text run at (11,10) width 18: "\x{2714}"
 layer at (126,271) size 548x59
   RenderBlock (relative positioned) {DIV} at (0,0) size 548x59 [border: none (1px dotted #CCCCCC) none]
-    RenderText {#text} at (0,0) size 0x0
     RenderInline {X-EDITABLE-LABEL} at (0,0) size 225x27 [color=#A9A9A9]
       RenderText {#text} at (0,0) size 0x0
       RenderText {#text} at (0,0) size 0x0
@@ -181,7 +179,6 @@ layer at (126,270) size 18x23
       text run at (11,10) width 18: "\x{2714}"
 layer at (126,330) size 548x59
   RenderBlock (relative positioned) {DIV} at (0,0) size 548x59 [border: none (1px dotted #CCCCCC) none]
-    RenderText {#text} at (0,0) size 0x0
     RenderInline {X-EDITABLE-LABEL} at (0,0) size 271x27
       RenderText {#text} at (0,0) size 0x0
       RenderText {#text} at (0,0) size 0x0