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[1] 空白。

* 仕様書

[REFS[
- [5] [CITE@en[RFC 7231 - Hypertext Transfer Protocol (HTTP/1.1): Semantics and Content]] ([TIME[2014-06-07 01:55:45 +09:00]] 版) <https://tools.ietf.org/html/rfc7231#section-5.5.2>
]REFS]

* 文脈

[6] [[対象URL]]を得たのが [[URL]] を持たないものからである場合
(例えば[[キーボード]]からの入力や[[栞]]からの選択である場合) には、
[CODE(HTTP)@en[[[Referer:]]]] を含めないか、
[CODE(URI)@en[[[about:blank]]]] を指定するかのいずれかとしなければ[['''なりません''']]
[SRC[>>5]]。

[14] 
[[Chrome]]
は
[CODE[javascript:]]
[[URL]]
を別窓で開くと、かわりに
[DFN[[CODE[about:blank#blocked]]]]
が開かれます。

* navigate

[SEE[ [[初期[CODE[about:blank]]文書]] ]]

* 歴史

[2] [[WinIE]]: 4+

[3] [CITE[IRC logs: freenode / #whatwg / 20100108]]
([TIME[2010-01-10 12:05:47 +09:00]] 版)
<http://krijnhoetmer.nl/irc-logs/whatwg/20100108#l-210>

[4] [CITE@en[(X)HTML5 Tracking]]
([TIME[2010-01-28 00:21:47 +09:00]] 版)
<http://html5.org/tools/web-apps-tracker?from=4627&to=4628>

[7] [CITE@en[Define the origin of non-initial about:blank documents · whatwg/html@baad9fd]]
([TIME[2016-03-25 13:32:26 +09:00]] 版)
<https://github.com/whatwg/html/commit/baad9fd10e5a49c1c72fc89426ffa2a26e0b72e4>

[FIG(quote)[
[FIGCAPTION[
[8] [CITE@en[RFC 7807 - Problem Details for HTTP APIs]]
([TIME[2016-04-02 09:15:58 +09:00]] 版)
<https://tools.ietf.org/html/rfc7807#section-4.2>
]FIGCAPTION]

> The "about:blank" URI '''['''RFC6694''']''', when used as a problem type,
>    indicates that the problem has no additional semantics beyond that of
>    the HTTP status code.
>    When "about:blank" is used, the title SHOULD be the same as the
>    recommended HTTP status phrase for that code (e.g., "Not Found" for
>    404, and so on), although it MAY be localized to suit client
>    preferences (expressed with the Accept-Language request header).
>    Please note that according to how the "type" member is defined
>    (Section 3.1), the "about:blank" URI is the default value for that
>    member.  Consequently, any problem details object not carrying an
>    explicit "type" member implicitly uses this URI.

]FIG]

[9] [CITE@en[Stop treating about URLs as same-origin]]
([[annevk]]著, [TIME[2016-09-14 22:34:34 +09:00]])
<https://github.com/whatwg/fetch/commit/72fc2e787be663f5bc39c88665dd3c356abbca0f>

[10] [CITE@en[The Joy of about:blank]]
( ([[Henri Sivonen]] 著, [TIME[2011-03-03 00:41:23 +09:00]] 版))
<http://hsivonen.iki.fi/about-blank/>

[11] [CITE@en[Web Applications 1.0 r8319     Make the default about:blank doc have a <head>]]
( ([TIME[2013-12-03 05:22:00 +09:00]] 版))
<http://html5.org/tools/web-apps-tracker?from=8318&to=8319>

[12] [CITE@en[Make status message default to the empty byte sequence]]
([[annevk]]著, [TIME[2018-04-25 01:21:13 +09:00]])
<https://github.com/whatwg/fetch/commit/0dec453f642c1fe57e6e7627c9a66cf7f8b8394d>

[13] [CITE@en[380383 - '''['''FIX''']'''about:blank encoding is not consistent]]
([TIME[2018-05-03 11:10:05 +09:00]])
<https://bugzilla.mozilla.org/show_bug.cgi?id=380383>

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