Clashes between web and X11 colors in the CSS color scheme. The first versions of Mosaic and Netscape Navigator used the X11 colors as the basis for the web colors list, as both were originally X applications.
The Cascading Style Sheets specification defines the same number of named colors as the HTML 4 spec, namely the 16 html colors, and 124 colors from the Netscape X11 color list for a total of 140 names that were recognized by Internet Explorer (IE) 3.0 and Netscape Navigator 3.0.
Chart of selected web colors. This chart shows selected HTML and X11 colors as well as selected unofficial consensus web colors developed by web designers since 2002. When entering code using the unofficial colors, the hex code of the color must be specified instead of writing the name of the color.HTML nameHex code R G BDecimal code R G BIndian RedCD 5C 5C205 92 92Light CoralF0 80 80240 128 128SalmonFA 80 72250 128 114Dark SalmonE9 96 7A233 150 122
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What is X11 color name?
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According to Khaki_(color)#Web_color_light_khaki, web kaki is #C3B091 and X11 khaki is #F0E68C. Quote> This is the color called khaki in X11. This is one of the cases where the X11 color names differs from the HTML/CSS names.--burga 21:13, 15 March 2009 (UTC) That article was wrong, I corrected it.
The following is a list of colors.A number of the color swatches below are taken from domain-specific naming schemes such as X11 or HTML4. RGB values are given for each swatch because such standards are defined in terms of the sRGB color space.
In the RGB color model, used to create all the colors on a television or computer screen, azure is created by adding a little green light to blue light. The complementary color of azure is orange. In the X11 color system, which became a standard for early web colors, azure is depicted as a pale cyan or white cyan.
Displayed at right is the web color Peru. This color was originally called Peruvian brown. The first recorded use of Peruvian brown as a color name in English was in 1924. The color name was changed to peru in 1987, when this color was formulated as one of the X11 colors, which in the early 1990s became known as the X11 web colors.
The web color ghost white is a tint of white associated with what the 'creator' of the color imagined the hue of a ghost could be.. There is no evidence that this color name was in use before the X11 color names were formulated in 1987.
Prior to standardization as a web color, Gainsboro was included as one of the X11 color names. It was, however, absent from the original 1987 version of the list,  but present in Paul Raveling's version  which added, amongst other things, "[l]ight and off-white colors, copied from several Sinclair Paints color samples".
X11の色名称（英: X11 color names ）は、X Window System において色を表すのに使われる文字列であり、単純なテキストファイルにその文字列とRGB値の対応の一覧が記述されている。