diff --git a/src/browser/dom/DefaultDOMPropertyConfig.js b/src/browser/dom/DefaultDOMPropertyConfig.js
index 0eba6322a2..49b6b224d1 100644
--- a/src/browser/dom/DefaultDOMPropertyConfig.js
+++ b/src/browser/dom/DefaultDOMPropertyConfig.js
@@ -98,9 +98,11 @@ var DefaultDOMPropertyConfig = {
     role: MUST_USE_ATTRIBUTE,
     rows: MUST_USE_ATTRIBUTE | HAS_POSITIVE_NUMERIC_VALUE,
     rowSpan: null,
+    sandbox: null,
     scope: null,
     scrollLeft: MUST_USE_PROPERTY,
     scrollTop: MUST_USE_PROPERTY,
+    seamless: MUST_USE_ATTRIBUTE | HAS_BOOLEAN_VALUE,
     selected: MUST_USE_PROPERTY | HAS_BOOLEAN_VALUE,
     size: MUST_USE_ATTRIBUTE | HAS_POSITIVE_NUMERIC_VALUE,
     span: HAS_POSITIVE_NUMERIC_VALUE,