Various custom bindings are unimplemented and will throw on execution. These are ones requiring more substantial investigation and implementation.

DartXMLHttpRequestCustom.cpp:
 - Sort out the ScriptString stuff
DartWorkerGlobalScopeCustom.cpp:
 - Sort out scripts
DartPopStateEventCustom.cpp:
 - Sort out script values
DartWindowCustom.cpp:
 - Sort out script values, implement missing methods
DartCSSStyleDeclarationCustom.cpp:
 - Sort out named property get/set
DartHTMLEmbedElementCustom.cpp:
  - See bug 533.
DartHTMLObjectElementCustom.cpp:
  - Implement getter/setter
DartHTMLOptionsCollectionCustom.cpp:

DartPromiseCustom.cpp:
 - Implement stuff (large)
DartLocationCustom.cpp:
 - Sort out implementation differences from V8
DartHTMLDocumentCustom.cpp:
  - Implementing this involves the frame code which seems to have v8 types
    embedded in it (e.g. see activeDOMWindow). Sort this out.
DartErrorEventCustom.cpp:
  - This uses javascript hidden properties, sort this out.
DartHistoryCustom.cpp:
 - This also uses javascript hidden properties.
DartMessageChannelCustom.cpp:
 - Implement custom constructor callback
   - relies on a use of setNamedHiddenReference, sort this out.
DartDedicatedWorkerGlobalScopeCustom.cpp:
  - Implementing postMessage requires serialized scripts to be sorted out.