[2] [DFN[CSS [RUBY[画素][ピクセル][pixel]]]]は、 [[Web]] で用いられる[[画素]]単位です。

[3] [[装置]]や[[プラットフォーム]]によって[[画素]]の大きさは異なりますが、
[[CSS画素]]はそれを抽象化した不変の尺度とされています。

[5] [[CSSの単位]] [DFN[[CODE(CSS)[px]]]] は、[[CSS画素]]の数を表す[[長さ]]の[[単位]]です。

* 歴史

[4] [CITE@en[IE 7 does not resize text sized in pixels | 456 Berea Street]] ([[Roger Johansson]] 著, [TIME[2007-03-21 12:26:47 +09:00]] 版) <http://www.456bereastreet.com/archive/200703/ie_7_does_not_resize_text_sized_in_pixels/>
([[名無しさん]] [WEAK[2007-03-21 03:28:13 +00:00]])

[REFS[
- [1] [CITE@en[Clarify that circular <area>'s radius in '''['''coords''']''' is in CSS px · whatwg/html@925ffb8]] ([TIME[2016-03-05 11:16:32 +09:00]] 版) <https://github.com/whatwg/html/commit/925ffb821f49bcf6dcec88ca756e0189879d5462>
]REFS]

[6] [CITE@en[Clarify canvas coordinate system]]
([[annevk]]著, [TIME[2017-09-29 01:15:22 +09:00]])
<https://github.com/whatwg/html/commit/8f2146b82c395397a8a3076ec2d642599f06d726>

[7] [CITE@en[Refer to "CSS pixels" not "CSS reference pixels" (#1163)]]
([[gsnedders]]著, [TIME[2017-11-30 23:05:37 +09:00]])
<https://github.com/w3c/webdriver/commit/537f64a509002b6e094ef581bd3d05397b0f2aa3>

[8] [CITE@en[Refer to "CSS pixels" not "CSS reference pixels" by gsnedders · Pull Request #1163 · w3c/webdriver]]
([TIME[2017-12-02 00:10:30 +09:00]])
<https://github.com/w3c/webdriver/pull/1163>