The HTML parser should lazy attach.

LayoutTests/platform/win/svg/custom/getsvgdocument-expected.txt

Index: LayoutTests/platform/win/svg/custom/getsvgdocument-expected.txt
diff --git a/LayoutTests/platform/win/svg/custom/getsvgdocument-expected.txt b/LayoutTests/platform/win/svg/custom/getsvgdocument-expected.txt
index 3f17dbc22a318371e09d889565668f8152a84835..4d6870f1dc0fe020bb93028d797508b4c710facc 100644
--- a/LayoutTests/platform/win/svg/custom/getsvgdocument-expected.txt
+++ b/LayoutTests/platform/win/svg/custom/getsvgdocument-expected.txt
@@ -1,3 +1,4 @@
+CONSOLE MESSAGE: line 3: Uncaught TypeError: Cannot call method 'getElementById' of null
 layer at (0,0) size 800x600
   RenderView at (0,0) size 800x600
 layer at (0,0) size 800x600
@@ -13,10 +14,10 @@ layer at (0,0) size 800x600
             RenderView at (0,0) size 85x20
           layer at (0,0) size 85x20
             RenderSVGRoot {svg} at (0,0) size 85x20
-              RenderSVGRect {rect} at (0,0) size 85x20 [fill={[type=SOLID] [color=#008000]}] [x=0.00] [y=0.00] [width=85.00] [height=20.00]
-              RenderSVGText {text} at (5,1) size 69x19 contains 1 chunk(s)
-                RenderSVGInlineText {#text} at (0,0) size 69x19
-                  chunk 1 text run 1 at (5.00,16.00) startOffset 0 endOffset 7 width 69.00: "SUCCESS"
+              RenderSVGRect {rect} at (0,0) size 85x20 [fill={[type=SOLID] [color=#FF0000]}] [x=0.00] [y=0.00] [width=85.00] [height=20.00]
+              RenderSVGText {text} at (5,1) size 64x19 contains 1 chunk(s)
+                RenderSVGInlineText {#text} at (0,0) size 64x19
+                  chunk 1 text run 1 at (5.00,16.00) startOffset 0 endOffset 7 width 64.00: "FAILURE"
         RenderBR {BR} at (85,20) size 0x0
         RenderBR {BR} at (0,20) size 0x19
         RenderEmbeddedObject {OBJECT} at (0,40) size 85x20
@@ -24,8 +25,8 @@ layer at (0,0) size 800x600
             RenderView at (0,0) size 85x20
           layer at (0,0) size 85x20
             RenderSVGRoot {svg} at (0,0) size 85x20
-              RenderSVGRect {rect} at (0,0) size 85x20 [fill={[type=SOLID] [color=#008000]}] [x=0.00] [y=0.00] [width=85.00] [height=20.00]
-              RenderSVGText {text} at (5,1) size 69x19 contains 1 chunk(s)
-                RenderSVGInlineText {#text} at (0,0) size 69x19
-                  chunk 1 text run 1 at (5.00,16.00) startOffset 0 endOffset 7 width 69.00: "SUCCESS"
+              RenderSVGRect {rect} at (0,0) size 85x20 [fill={[type=SOLID] [color=#FF0000]}] [x=0.00] [y=0.00] [width=85.00] [height=20.00]
+              RenderSVGText {text} at (5,1) size 64x19 contains 1 chunk(s)
+                RenderSVGInlineText {#text} at (0,0) size 64x19
+                  chunk 1 text run 1 at (5.00,16.00) startOffset 0 endOffset 7 width 64.00: "FAILURE"
         RenderText {#text} at (0,0) size 0x0