[1] [CITE@en[Web Applications 1.0 r8010     Make the empty string no longer be a possible index for most objects that can be indexed by name.]]
( ([TIME[2013-07-03 06:45:00 +09:00]] 版))
<http://html5.org/tools/web-apps-tracker?from=8009&to=8010>

[2] [CITE[Web IDL (Second Edition)]]
( ([TIME[2014-02-10 21:45:38 +09:00]] 版))
<http://heycam.github.io/webidl/#dfn-supported-property-names>