在 HTML 頁面中可以兩種方式指定顏色──以顏色名稱或者表示 RGB 顏色值的數(shù)字。一個(gè) RGB 顏色值由三個(gè)兩位十六進(jìn)制數(shù)字組成，分別代表各自的顏色強(qiáng)度。
例如，顏色值 #FF0000 之所以被渲染為紅色，是因?yàn)榧t色的值達(dá)到了最高值 FF (等于十進(jìn)制的 255)。
當(dāng)你使用 !DOCTYPE 聲明指定為標(biāo)準(zhǔn)兼容模式時(shí)，Microsoft® Internet Explorer 6 和以后版本將忽略不遵從樣式表(CSS)級別 1 的樣式表聲明。根據(jù) CSS 1，以十六進(jìn)制 RGB 值指定的顏色必須帶有前導(dǎo)“#”字符。像“FFFFFF”這樣的值將被忽略，而不會被理解為“#FFFFFF”(即白色)，但 Internet Explorer 的先前版本是這么理解的。這影響所有接受顏色值的屬性。
下表列出了 Internet Explorer 4.0 支持的顏色。
| aliceblue (#F0F8FF) |
antiquewhite (#FAEBD7) |
aqua (#00FFFF) |
aquamarine (#7FFFD4) |
| azure (#F0FFFF) |
beige (#F5F5DC) |
bisque (#FFE4C4) |
black (#000000) |
| blanchedalmond (#FFEBCD) |
blue (#0000FF) |
blueviolet (#8A2BE2) |
brown (#A52A2A) |
| burlywood (#DEB887) |
cadetblue (#5F9EA0) |
chartreuse (#7FFF00) |
chocolate (#D2691E) |
| coral (#FF7F50) |
cornflowerblue (#6495ED) |
cornsilk (#FFF8DC) |
crimson (#DC143C) |
| cyan (#00FFFF) |
darkblue (#00008B) |
darkcyan (#008B8B) |
darkgoldenrod (#B8860B) |
| darkgray (#A9A9A9) |
darkgreen (#006400) |
darkkhaki (#BDB76B) |
darkmagenta (#8B008B) |
| darkolivegreen (#556B2F) |
darkorange (#FF8C00) |
darkorchid (#9932CC) |
darkred (#8B0000) |
| darksalmon (#E9967A) |
darkseagreen (#8FBC8B) |
darkslateblue (#483D8B) |
darkslategray (#2F4F4F) |
| darkturquoise (#00CED1) |
darkviolet (#9400D3) |
deeppink (#FF1493) |
deepskyblue (#00BFFF) |
| dimgray (#696969) |
dodgerblue (#1E90FF) |
firebrick (#B22222) |
floralwhite (#FFFAF0) |
| forestgreen (#228B22) |
fuchsia (#FF00FF) |
gainsboro (#DCDCDC) |
ghostwhite (#F8F8FF) |
| gold (#FFD700) |
goldenrod (#DAA520) |
gray (#808080) |
green (#008000) |
| greenyellow (#ADFF2F) |
honeydew (#F0FFF0) |
hotpink (#FF69B4) |
indianred (#CD5C5C) |
| indigo (#4B0082) |
ivory (#FFFFF0) |
khaki (#F0E68C) |
lavender (#E6E6FA) |
| lavenderblush (#FFF0F5) |
lawngreen (#7CFC00) |
lemonchiffon (#FFFACD) |
lightblue (#ADD8E6) |
| lightcoral (#F08080) |
lightcyan (#E0FFFF) |
lightgoldenrodyellow (#FAFAD2) |
lightgreen (#90EE90) |
| lightgrey (#D3D3D3) |
lightpink (#FFB6C1) |
lightsalmon (#FFA07A) |
lightseagreen (#20B2AA) |
| lightskyblue (#87CEFA) |
lightslategray (#778899) |
lightsteelblue (#B0C4DE) |
lightyellow (#FFFFE0) |
| lime (#00FF00) |
limegreen (#32CD32) |
linen (#FAF0E6) |
magenta (#FF00FF) |
| maroon (#800000) |
mediumaquamarine (#66CDAA) |
mediumblue (#0000CD) |
mediumorchid (#BA55D3) |
| mediumpurple (#9370DB) |
mediumseagreen (#3CB371) |
mediumslateblue (#7B68EE) |
mediumspringgreen (#00FA9A) |
| mediumturquoise (#48D1CC) |
mediumvioletred (#C71585) |
midnightblue (#191970) |
mintcream (#F5FFFA) |
| mistyrose (#FFE4E1) |
moccasin (#FFE4B5) |
navajowhite (#FFDEAD) |
navy (#000080) |
| oldlace (#FDF5E6) |
olive (#808000) |
olivedrab (#6B8E23) |
orange (#FFA500) |
| orangered (#FF4500) |
orchid (#DA70D6) |
palegoldenrod (#EEE8AA) |
palegreen (#98FB98) |
| paleturquoise (#AFEEEE) |
palevioletred (#DB7093) |
papayawhip (#FFEFD5) |
peachpuff (#FFDAB9) |
| peru (#CD853F) |
pink (#FFC0CB) |
plum (#DDA0DD) |
powderblue (#B0E0E6) |
| purple (#800080) |
red (#FF0000) |
rosybrown (#BC8F8F) |
royalblue (#4169E1) |
| saddlebrown (#8B4513) |
salmon (#FA8072) |
sandybrown (#F4A460) |
seagreen (#2E8B57) |
| seashell (#FFF5EE) |
sienna (#A0522D) |
silver (#C0C0C0) |
skyblue (#87CEEB) |
| slateblue (#6A5ACD) |
slategray (#708090) |
snow (#FFFAFA) |
springgreen (#00FF7F) |
| steelblue (#4682B4) |
tan (#D2B48C) |
teal (#008080) |
thistle (#D8BFD8) |
| tomato (#FF6347) |
turquoise (#40E0D0) |
violet (#EE82EE) |
wheat (#F5DEB3) |
| white (#FFFFFF) |
whitesmoke (#F5F5F5) |
yellow (#FFFF00) |
yellowgreen (#9ACD32) |
Microsoft® Windows® 維護(hù)著一組用于繪制用戶界面不同部分的系統(tǒng)顏色。除了定義在顏色表中的顏色，在 Internet Explorer 4.0 中也可正常顯示以下系統(tǒng)顏色指定為顏色值的 Web 頁。
用戶可以使用 Windows 控制面板設(shè)置用于將來 Windows 會話的系統(tǒng)顏色。下表演示了定義在控制面板中的顏色名稱的對應(yīng)情況。
| activeborder | activecaption | appworkspace | background |
| buttonface | buttonhighlight | buttonshadow | buttontext |
| captiontext | graytext | highlight | highlighttext |
| inactiveborder | inactivecaption | inactivecaptiontext | infobackground |
| infotext | menu | menutext | scrollbar |
| threeddarkshadow | threedface | threedhighlight | threedlightshadow |
| threedshadow | window | windowframe | windowtext |