[1] [[英語]]に使われる26組52種類の[[ラテン文字]]を[DFN[[[基本ラテン文字]]]]などと言います。

* 仕様書

[REFS[
- [2] [CITE@en[URL Standard]] ([TIME[2016-02-15 18:33:32 +09:00]] 版) <https://url.spec.whatwg.org/#ascii-alpha>
- [6] [CITE@en-GB-x-hixie[HTML Standard]] ([TIME[2016-04-09 09:15:24 +09:00]] 版) <https://html.spec.whatwg.org/#ascii-letters>
]REFS]

* 意味

[4] [DFN[[RUBYB[ASCII英字]@en[ASCII alpha]]]]は、
[[範囲]] [ [CODE(char)[U+0041]], [CODE(char)[U+005A]] ] と[[範囲]]
[ [CODE(char)[U+0061]], [CODE(char)[U+007A]] ] の[[符号位置]]です [SRC[>>2]]。

[7] [DFN[ASCII letters]] は、
[[ASCII大文字]]と[[ASCII小文字]]です [SRC[>>6]]。

[8] どちらも同じ意味です。

* 文字の一覧

[REFS[
- [3] [CITE@en[Character set "ASCII alpha"]] ([TIME[2016-03-06 23:04:16 +09:00]] 版) <https://chars.suikawiki.org/set/%24url%3AASCII-alpha>
- [9] [CITE@en[Character set "ASCII letters"]] ([TIME[2016-03-06 23:04:16 +09:00]] 版) <https://chars.suikawiki.org/set/%24html%3AASCII-letters>
]REFS]

[10] 
[FIG(short list)[
- [CODE[A]]
- [CODE[B]]
- [CODE[C]]
- [CODE[D]]
- [CODE[E]]
- [CODE[F]]
- [CODE[G]]
- [CODE[H]]
- [CODE[I]]
- [CODE[J]]
- [CODE[K]]
- [CODE[L]]
- [CODE[M]]
- [CODE[N]]
- [CODE[O]]
- [CODE[P]]
- [CODE[Q]]
- [CODE[R]]
- [CODE[S]]
- [CODE[T]]
- [CODE[U]]
- [CODE[V]]
- [CODE[W]]
- [CODE[X]]
- [CODE[Y]]
- [CODE[Z]]
]FIG]

* 関連

[5] [[ASCII英字]]は、[[ASCII英数字]]です。

* 歴史

[11] [CITE@en[Editorial: start using the Infra Standard]]
([[annevk]]著, [TIME[2016-11-21 20:23:59 +09:00]])
<https://github.com/whatwg/url/commit/9001b9be7475fdf4a7a2757b5417aa4a9f06b3b6>

[12] [CITE@en[Breaking: adjust some code point definitions]]
([[annevk]]著, [TIME[2016-11-30 22:17:47 +09:00]])
<https://github.com/whatwg/infra/commit/aa38c291fc978252751a9c9942c382e879d0985e>

[13] [CITE@en[Editorial: use more terms from the Infra Standard]]
([[annevk]]著, [TIME[2017-02-08 17:12:54 +09:00]])
<https://github.com/whatwg/html/commit/104bd78697738af2eab61740a2f1421ae49a3c95>