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Specification: https://html.spec.whatwg.org/ Multipage: https://html.spec.whatwg.org/multipage/#the-domstringmap-interface Complete: https://html.spec.whatwg.org/#the-domstringmap-interface Referrer: Comment: DOMStringMap should not be exposed on Worker Posted from: 14.162.102.153 User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_10_2) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/40.0.2214.111 Safari/537.36 OPR/27.0.1689.69
It's only used for HTMLElement.dataset, and HTMLElement isn't exposed on Worker.
https://github.com/whatwg/html/pull/302