[FIG(quote)[
[FIGCAPTION[
[1] [CITE@en[Safari 9.0]]
([TIME[2015-11-04 23:31:31 +09:00]] 版)
<https://developer.apple.com/library/safari/releasenotes/General/WhatsNewInSafari/Articles/Safari_9.html#//apple_ref/doc/uid/TP40014305-CH9-SW27>
]FIGCAPTION]

> The following ECMAScript 6 content is now supported by Safari:
> Symbol Objects

]FIG]


[2] [CITE@en[Write structured clone algorithm in terms of ECMAScript · whatwg/html@bfb960c]]
([TIME[2016-03-02 16:45:03 +09:00]] 版)
<https://github.com/whatwg/html/commit/bfb960c938580c95e77365e614218b952f96375b>

[3] [CITE@en[Add the symbol type]]
([[domenic]]著, [TIME[2017-08-01 00:38:30 +09:00]])
<https://github.com/heycam/webidl/commit/d6c3ddbfe74d4a6192aae98bcf03b6c323582e8d>

[4] [CITE@en[27553 – Support Symbol]]
([TIME[2017-08-02 17:07:27 +09:00]])
<https://www.w3.org/Bugs/Public/show_bug.cgi?id=27553>

[5] [CITE@en[`any` type conversion does not take into account of symbols · Issue #301 · heycam/webidl]]
([TIME[2017-08-02 17:08:07 +09:00]])
<https://github.com/heycam/webidl/issues/301>

[6] [CITE@en[Add the symbol type by domenic · Pull Request #377 · heycam/webidl]]
([TIME[2017-08-02 17:09:36 +09:00]])
<https://github.com/heycam/webidl/pull/377>

[7] [CITE@en[Handle Symbols correctly in legacy platform object's '''[''''''['''DefineOwnPrope…]]
([[TimothyGu]]著, [TIME[2017-08-17 04:47:39 +09:00]])
<https://github.com/heycam/webidl/commit/c062489e7289c1614f695599783af3f8dbe6ef9e>