在HTML里，颜色有两种表示方式。一种是用颜色名称表示，比如blue表示蓝色。另外一种是用16进制的数值表示RGB的颜色值。RGB是Red，Green，Blue意思，RGB每个原色的最小值是0，最大值是255，如果换算成16进制表示，就是(#00)，(#FF)。比如白色的RGB(255,255,255)，就用#FFFFFF表示；还有黑色的RGB(0,0,0)，就用#000000表示。
注：在W3C制定的HTML 4.0标准中，只有16种颜色可以用颜色名称表示(aqua, black, blue, fuchsia, gray, green, lime, maroon, navy, olive, purple, red, silver, teal, white, and yellow)，其它的颜色都要用16进制RGB颜色值表示。
当然，现在的浏览器支持更多的颜色名称。不过为保险起见，建议你还是采用16进制RGB颜色值来表示颜色。并且在值前加上#这个符号。
为了方便大家找到合适的颜色，我们在这里列了一些颜色说明，以供大家参考，不妨作为一种速查工具。
以前，很多电脑显示器最多支持256色，因此出现了216种Web安全颜色，以保证网页的颜色能够正确显示。
那为什么不是256种Web安全颜色呢？因为Microsoft和Mac操作系统有40种不同的系统保留颜色。
以下就是216种Web安全颜色：
| #000000 | #000033 | #000066 | #000099 | #0000CC | #0000FF |
| #003300 | #003333 | #003366 | #003399 | #0033CC | #0033FF |
| #006600 | #006633 | #006666 | #006699 | #0066CC | #0066FF |
| #009900 | #009933 | #009966 | #009999 | #0099CC | #0099FF |
| #00CC00 | #00CC33 | #00CC66 | #00CC99 | #00CCCC | #00CCFF |
| #00FF00 | #00FF33 | #00FF66 | #00FF99 | #00FFCC | #00FFFF |
| #330000 | #330033 | #330066 | #330099 | #3300CC | #3300FF |
| #333300 | #333333 | #333366 | #333399 | #3333CC | #3333FF |
| #336600 | #336633 | #336666 | #336699 | #3366CC | #3366FF |
| #339900 | #339933 | #339966 | #339999 | #3399CC | #3399FF |
| #33CC00 | #33CC33 | #33CC66 | #33CC99 | #33CCCC | #33CCFF |
| #33FF00 | #33FF33 | #33FF66 | #33FF99 | #33FFCC | #33FFFF |
| #660000 | #660033 | #660066 | #660099 | #6600CC | #6600FF |
| #663300 | #663333 | #663366 | #663399 | #6633CC | #6633FF |
| #666600 | #666633 | #666666 | #666699 | #6666CC | #6666FF |
| #669900 | #669933 | #669966 | #669999 | #6699CC | #6699FF |
| #66CC00 | #66CC33 | #66CC66 | #66CC99 | #66CCCC | #66CCFF |
| #66FF00 | #66FF33 | #66FF66 | #66FF99 | #66FFCC | #66FFFF |
| #990000 | #990033 | #990066 | #990099 | #9900CC | #9900FF |
| #993300 | #993333 | #993366 | #993399 | #9933CC | #9933FF |
| #996600 | #996633 | #996666 | #996699 | #9966CC | #9966FF |
| #999900 | #999933 | #999966 | #999999 | #9999CC | #9999FF |
| #99CC00 | #99CC33 | #99CC66 | #99CC99 | #99CCCC | #99CCFF |
| #99FF00 | #99FF33 | #99FF66 | #99FF99 | #99FFCC | #99FFFF |
| #CC0000 | #CC0033 | #CC0066 | #CC0099 | #CC00CC | #CC00FF |
| #CC3300 | #CC3333 | #CC3366 | #CC3399 | #CC33CC | #CC33FF |
| #CC6600 | #CC6633 | #CC6666 | #CC6699 | #CC66CC | #CC66FF |
| #CC9900 | #CC9933 | #CC9966 | #CC9999 | #CC99CC | #CC99FF |
| #CCCC00 | #CCCC33 | #CCCC66 | #CCCC99 | #CCCCCC | #CCCCFF |
| #CCFF00 | #CCFF33 | #CCFF66 | #CCFF99 | #CCFFCC | #CCFFFF |
| #FF0000 | #FF0033 | #FF0066 | #FF0099 | #FF00CC | #FF00FF |
| #FF3300 | #FF3333 | #FF3366 | #FF3399 | #FF33CC | #FF33FF |
| #FF6600 | #FF6633 | #FF6666 | #FF6699 | #FF66CC | #FF66FF |
| #FF9900 | #FF9933 | #FF9966 | #FF9999 | #FF99CC | #FF99FF |
| #FFCC00 | #FFCC33 | #FFCC66 | #FFCC99 | #FFCCCC | #FFCCFF |
| #FFFF00 | #FFFF33 | #FFFF66 | #FFFF99 | #FFFFCC | #FFFFFF |
下面是微软IE4.0以上都支持的颜色名称：
| 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) |