Add the <t> element and ignore whitespace outside it.

sky/engine/core/html/parser/HTMLElementStack.h

Index: sky/engine/core/html/parser/HTMLElementStack.h
diff --git a/sky/engine/core/html/parser/HTMLElementStack.h b/sky/engine/core/html/parser/HTMLElementStack.h
index 769c7f256d3d5f2f6f71019b42d62d02b767dd72..5d1da783dae1c0197dcb795059ca1e85f70177ec 100644
--- a/sky/engine/core/html/parser/HTMLElementStack.h
+++ b/sky/engine/core/html/parser/HTMLElementStack.h
@@ -71,6 +71,8 @@ public:
 
     unsigned stackDepth() const { return m_stackDepth; }
 
+    bool preserveWhiteSpace() const { return m_preserveWhiteSpaceCount; }
+
     // Inlining this function is a (small) performance win on the parsing
     // benchmark.
     Element* top() const
@@ -107,6 +109,7 @@ private:
 
     ContainerNode* m_rootNode;
     unsigned m_stackDepth;
+    unsigned m_preserveWhiteSpaceCount;
 };
 
 } // namespace blink