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http://heycam.github.io/webidl/#dfn-optional-argument-default-value The text: [[ then that gives the optional argument its default value. ]] links to: #dfn-default-value ...but that definition does not exist: http://heycam.github.io/webidl/#dfn-default-value Instead, it should link to #dfn-optional-argument-default-value (This is b/c there's now a difference between default value for optional args and for dictionaries, AFAICT.)
This seems to be have been fixed during conversion to bikeshed or thereabouts.