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trullock / NUglify

NUglify is a HTML, JavaScript and CSS minification Library for .NET (fork of AjaxMin + new features)
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Missing CSS optimization - colors #315

Open SpeednetGroup opened 2 years ago

SpeednetGroup commented 2 years ago

Please update the CSS optimizations in NUglify to optimize colors.

The shortest methods of including a color in CSS are either with the color name (red, blue, etc.) or with a 6- or 3-digit hex string (#f0f0f0, #e00, etc.).

All CSS colors, except those that include an opacity, should be converted to the shortest color represented either by name or 6- or 3-digit hex string. That would include colors defined by RBG notation (using specific numbers or percentages) and possibly HSL.

RGB is pretty simple to convert to a hex string, which can then be evaluated for possible shrinking to 3-digits or converted to the corresponding name.

Colors that are shorter as hex strings

aliceblue => #f0f8ff antiquewhite => #faebd7 aquamarine => #7fffd4 black => #000 blanchedalmond => #ffebcd blueviolet => #8a2be2 burlywood => #deb887 cadetblue => #5f9ea0 chartreuse => #7fff00 chocolate => #d2691e cornflowerblue => #6495ed cornsilk => #fff8dc darkblue => #00008b darkcyan => #008b8b darkgoldenrod => #b8860b darkgray => #a9a9a9 darkgreen => #006400 darkkhaki => #bdb76b darkmagenta => #8b008b darkolivegreen => #556b2f darkorange => #ff8c00 darkorchid => #9932cc darksalmon => #e9967a darkseagreen => #8fbc8f darkslateblue => #483d8b darkslategray => #2f4f4f darkturquoise => #00ced1 darkviolet => #9400d3 deeppink => #ff1493 deepskyblue => #00bfff dodgerblue => #1e90ff firebrick => #b22222 floralwhite => #fffaf0 forestgreen => #228b22 fuchsia => #f0f gainsboro => #dcdcdc ghostwhite => #f8f8ff greenyellow => #adff2f honeydew => #f0fff0 indianred => #cd5c5c 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 => #789 lightsteelblue => #b0c4de lightyellow => #ffffe0 limegreen => #32cd32 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 navyblue => #9fafdf olivedrab => #6b8e23 orangered => #ff4500 palegoldenrod => #eee8aa palegreen => #98fb98 paleturquoise => #afeeee palevioletred => #db7093 papayawhip => #ffefd5 peachpuff => #ffdab9 powderblue => #b0e0e6 rosybrown => #bc8f8f royalblue => #4169e1 saddlebrown => #8b4513 sandybrown => #f4a460 seashell => #fff5ee whitesmoke => #f5f5f5 yellowgreen => #9acd32

Colors that are shorter as hex strings, but need to be substituted last because they are partial macthes for other color names

goldenrod => #daa520 lavender => #e6e6fa magenta => #f0f seagreen => #2e8b57 slateblue => #6a5acd slategray => #708090 springgreen => #00ff7f steelblue => #4682b4 turquoise => #40e0d0 white => #fff yellow => #ff0

Colors that are shorter as CSS names

f0ffff => azure

f5f5dc => beige

ffe4c4 => bisque

a52a2a => brown

ff7f50 => coral

ffd700 => gold

808080 => gray

008000 => green

4b0082 => indigo

fffff0 => ivory

f0e68c => khaki

faf0e6 => linen

800000 => maroon

# 000080 => navy

808000 => olive

ffa500 => orange

da70d6 => orchid

cd853f => peru

ffc0cb => pink

dda0dd => plum

800080 => purple

f00 => red

fa8072 => salmon

a0522d => sienna

c0c0c0 => silver

fffafa => snow

d2b48c => tan

008080 => teal

ff6347 => tomato

ee82ee => violet

f5deb3 => wheat

trullock commented 2 years ago

If you've already written this code in your hand rolled version, care to share it to save it being rewritten here

SpeednetGroup commented 2 years ago

I do have some code that I can rip out, but be warned it is written in VB.NET. The code establishes a static Dictionary that holds color replacement regular expressions (for performance reasons) and then loops through them to check each possible color value.

The other thing I do is to be sure that all colors (both hex and names) are lower-case. There was a study a while back showing a slight performance increase and better network transmission times if you do this.

I'll try to pull out everything relevant from my code and paste below. It might be 12-15 years since I've looked at this code, so no guarantees. It has been in production all that time however.

Public Class CodeTransformation
    Private Shared ReadOnly _CssColors As Dictionary(Of String, CssColorReplacement) = LoadColors()
    Private Shared ReadOnly _Regex_CssRGBColors As New Regex("(?<=\W)rgb\((-?(?:25[0-5]|2[0-4]\d|1\d\d|[1-9]\d|\d)(?:\.\d*)?%?),(-?(?:25[0-5]|2[0-4]\d|1\d\d|[1-9]\d|\d)(?:\.\d*)?%?),(-?(?:25[0-5]|2[0-4]\d|1\d\d|[1-9]\d|\d)(?:\.\d*)?%?)\)(?=[^{}]*})", RegexOptions.IgnoreCase)
    Private Shared ReadOnly _Regex_Css6HexTo3Hex As New Regex("(?<!filter:[^;]*)#([\da-f])\1([\da-f])\2([\da-f])\3(?=[^{}]*})", RegexOptions.IgnoreCase)
    Private Shared ReadOnly _Regex_CssAllHex As New Regex("#([\da-f]{6}|[\da-f]{3})(?![\da-f])(?=[^{}]*})", RegexOptions.IgnoreCase)
    Private Shared ReadOnly _Regex_CssToLowerCase As New Regex("(?<!(?:url|expression)\([^)]*|[.#][-\w]*|(?:font(?:-family)?|content):[^;}]*|\[[^\]]*)(?-i:[A-Z]+)", RegexOptions.IgnoreCase)
    Private Shared ReadOnly _Regex_CssColorNamesToLower As New Regex("(?<=color:|background:|border(?:-top|-right|-bottom|-left)?:[^{}:;]*|outline:[^{}:;]*)(azure|beige|bisque|brown|coral|gold|gray|green|indigo|ivory|khaki|linen|maroon|navy|olive|orange|orchid|peru|pink|plum|purple|red|salmon|sienna|silver|snow|tan|teal|tomato|violet|wheat|aqua|blue|crimson|cyan|darkred|dimgray|hotpink|lime|oldlace|skyblue|thistle)(?![a-z])(?=[^{}]*})", RegexOptions.IgnoreCase)

    Public Shared Function DeflateCss(ByVal source As String) As String

        If (String.IsNullOrEmpty(source)) Then
            Return String.Empty
        End If

        '***Only including relevant code here
        _CSS_ShortCuts(source)

        Return source
    End Function

    Private Shared Sub _CSS_ShortCuts(ByRef n As String)
        '***Only including relevant code here

        'Change RGB() colors to hex codes
        If (_Regex_CssRGBColors.IsMatch(n)) Then
            n = _Regex_CssRGBColors.Replace(n, AddressOf ConvertRGB)
        End If

        n = _Regex_Css6HexTo3Hex.Replace(n, "#$1$2$3")  'Change 6-digit colors to 3-digit (where possible)

        For Each color As KeyValuePair(Of String, CssColorReplacement) In _CssColors

            If (n.IndexOf(color.Key, StringComparison.OrdinalIgnoreCase) >= 0) Then
                n = color.Value.RegexFind.Replace(n, color.Value.Replacement)
            End If

        Next

        n = _Regex_CssAllHex.Replace(n, AddressOf ConvertLowerCase) 'Change all hex colors to lower case

        'Convert everything that is not a URL, class name, id name, or font family to lower case
        n = _Regex_CssToLowerCase.Replace(n, AddressOf ConvertLowerCase)

        'Change color names to lower case.  Must do this because leading # signs are ignored
        'in global lower-case conversion to avoid converting id names, which can be case-sensitive
        n = _Regex_CssColorNamesToLower.Replace(n, AddressOf ConvertLowerCase)
    End Sub

    Private Shared Function ConvertRGB(ByVal M As Match) As String
        Dim sb As New StringBuilder("#", 7)
        Dim s As String
        Dim i As Integer

        For x As Integer = 1 To 3
            s = M.Groups(x).Value

            If (s.EndsWith("%")) Then
                i = Convert.ToInt32(Math.Round(255.0R * (Math.Min(100.0R, Math.Max(0.0R, Convert.ToDouble(s.LeftExcept(1)))) * 0.01R)))
            Else
                i = Convert.ToInt32(Math.Round(Math.Min(255.0R, Math.Max(0.0R, Convert.ToDouble(s)))))
            End If

            sb.Append(Conversion.Hex(i).PadLeft(2, "0"c).ToLower())
        Next

        Return sb.ToString()
    End Function

    Private Shared Function ConvertLowerCase(ByVal M As Match) As String
        Return M.Value.ToLower()
    End Function

    Private Class CssColorReplacement
        Public RegexFind As Regex
        Public Replacement As String

        Public Sub New(ByVal pRegexFind As Regex, ByVal pReplacement As String)
            RegexFind = pRegexFind
            Replacement = pReplacement
        End Sub

    End Class

    Private Shared Function LoadColors() As Dictionary(Of String, CssColorReplacement)
        Dim colors As New Dictionary(Of String, CssColorReplacement)
        'Dim pre As String = "(?<=[ :(),])"
        Dim pre As String = "(?<=color:|background:|border(?:-top|-right|-bottom|-left)?:[^{}:;]*|outline:[^{}:;]*)"

        'Colors that are shorter as hex strings
        colors.Add("aliceblue", New CssColorReplacement(New Regex(String.Concat(pre, "aliceblue"), RegexOptions.IgnoreCase), "#f0f8ff"))
        colors.Add("antiquewhite", New CssColorReplacement(New Regex(String.Concat(pre, "antiquewhite"), RegexOptions.IgnoreCase), "#faebd7"))
        colors.Add("aquamarine", New CssColorReplacement(New Regex(String.Concat(pre, "aquamarine"), RegexOptions.IgnoreCase), "#7fffd4"))
        colors.Add("black", New CssColorReplacement(New Regex(String.Concat(pre, "black"), RegexOptions.IgnoreCase), "#000"))
        colors.Add("blanchedalmond", New CssColorReplacement(New Regex(String.Concat(pre, "blanchedalmond"), RegexOptions.IgnoreCase), "#ffebcd"))
        colors.Add("blueviolet", New CssColorReplacement(New Regex(String.Concat(pre, "blueviolet"), RegexOptions.IgnoreCase), "#8a2be2"))
        colors.Add("burlywood", New CssColorReplacement(New Regex(String.Concat(pre, "burlywood"), RegexOptions.IgnoreCase), "#deb887"))
        colors.Add("cadetblue", New CssColorReplacement(New Regex(String.Concat(pre, "cadetblue"), RegexOptions.IgnoreCase), "#5f9ea0"))
        colors.Add("chartreuse", New CssColorReplacement(New Regex(String.Concat(pre, "chartreuse"), RegexOptions.IgnoreCase), "#7fff00"))
        colors.Add("chocolate", New CssColorReplacement(New Regex(String.Concat(pre, "chocolate"), RegexOptions.IgnoreCase), "#d2691e"))
        colors.Add("cornflowerblue", New CssColorReplacement(New Regex(String.Concat(pre, "cornflowerblue"), RegexOptions.IgnoreCase), "#6495ed"))
        colors.Add("cornsilk", New CssColorReplacement(New Regex(String.Concat(pre, "cornsilk"), RegexOptions.IgnoreCase), "#fff8dc"))
        colors.Add("darkblue", New CssColorReplacement(New Regex(String.Concat(pre, "darkblue"), RegexOptions.IgnoreCase), "#00008b"))
        colors.Add("darkcyan", New CssColorReplacement(New Regex(String.Concat(pre, "darkcyan"), RegexOptions.IgnoreCase), "#008b8b"))
        colors.Add("darkgoldenrod", New CssColorReplacement(New Regex(String.Concat(pre, "darkgoldenrod"), RegexOptions.IgnoreCase), "#b8860b"))
        colors.Add("darkgray", New CssColorReplacement(New Regex(String.Concat(pre, "darkgray"), RegexOptions.IgnoreCase), "#a9a9a9"))
        colors.Add("darkgreen", New CssColorReplacement(New Regex(String.Concat(pre, "darkgreen"), RegexOptions.IgnoreCase), "#006400"))
        colors.Add("darkkhaki", New CssColorReplacement(New Regex(String.Concat(pre, "darkkhaki"), RegexOptions.IgnoreCase), "#bdb76b"))
        colors.Add("darkmagenta", New CssColorReplacement(New Regex(String.Concat(pre, "darkmagenta"), RegexOptions.IgnoreCase), "#8b008b"))
        colors.Add("darkolivegreen", New CssColorReplacement(New Regex(String.Concat(pre, "darkolivegreen"), RegexOptions.IgnoreCase), "#556b2f"))
        colors.Add("darkorange", New CssColorReplacement(New Regex(String.Concat(pre, "darkorange"), RegexOptions.IgnoreCase), "#ff8c00"))
        colors.Add("darkorchid", New CssColorReplacement(New Regex(String.Concat(pre, "darkorchid"), RegexOptions.IgnoreCase), "#9932cc"))
        colors.Add("darksalmon", New CssColorReplacement(New Regex(String.Concat(pre, "darksalmon"), RegexOptions.IgnoreCase), "#e9967a"))
        colors.Add("darkseagreen", New CssColorReplacement(New Regex(String.Concat(pre, "darkseagreen"), RegexOptions.IgnoreCase), "#8fbc8f"))
        colors.Add("darkslateblue", New CssColorReplacement(New Regex(String.Concat(pre, "darkslateblue"), RegexOptions.IgnoreCase), "#483d8b"))
        colors.Add("darkslategray", New CssColorReplacement(New Regex(String.Concat(pre, "darkslategray"), RegexOptions.IgnoreCase), "#2f4f4f"))
        colors.Add("darkturquoise", New CssColorReplacement(New Regex(String.Concat(pre, "darkturquoise"), RegexOptions.IgnoreCase), "#00ced1"))
        colors.Add("darkviolet", New CssColorReplacement(New Regex(String.Concat(pre, "darkviolet"), RegexOptions.IgnoreCase), "#9400d3"))
        colors.Add("deeppink", New CssColorReplacement(New Regex(String.Concat(pre, "deeppink"), RegexOptions.IgnoreCase), "#ff1493"))
        colors.Add("deepskyblue", New CssColorReplacement(New Regex(String.Concat(pre, "deepskyblue"), RegexOptions.IgnoreCase), "#00bfff"))
        colors.Add("dodgerblue", New CssColorReplacement(New Regex(String.Concat(pre, "dodgerblue"), RegexOptions.IgnoreCase), "#1e90ff"))
        colors.Add("firebrick", New CssColorReplacement(New Regex(String.Concat(pre, "firebrick"), RegexOptions.IgnoreCase), "#b22222"))
        colors.Add("floralwhite", New CssColorReplacement(New Regex(String.Concat(pre, "floralwhite"), RegexOptions.IgnoreCase), "#fffaf0"))
        colors.Add("forestgreen", New CssColorReplacement(New Regex(String.Concat(pre, "forestgreen"), RegexOptions.IgnoreCase), "#228b22"))
        colors.Add("fuchsia", New CssColorReplacement(New Regex(String.Concat(pre, "fuchsia"), RegexOptions.IgnoreCase), "#f0f"))
        colors.Add("gainsboro", New CssColorReplacement(New Regex(String.Concat(pre, "gainsboro"), RegexOptions.IgnoreCase), "#dcdcdc"))
        colors.Add("ghostwhite", New CssColorReplacement(New Regex(String.Concat(pre, "ghostwhite"), RegexOptions.IgnoreCase), "#f8f8ff"))
        colors.Add("greenyellow", New CssColorReplacement(New Regex(String.Concat(pre, "greenyellow"), RegexOptions.IgnoreCase), "#adff2f"))
        colors.Add("honeydew", New CssColorReplacement(New Regex(String.Concat(pre, "honeydew"), RegexOptions.IgnoreCase), "#f0fff0"))
        colors.Add("indianred", New CssColorReplacement(New Regex(String.Concat(pre, "indianred"), RegexOptions.IgnoreCase), "#cd5c5c"))
        colors.Add("lavenderblush", New CssColorReplacement(New Regex(String.Concat(pre, "lavenderblush"), RegexOptions.IgnoreCase), "#fff0f5"))
        colors.Add("lawngreen", New CssColorReplacement(New Regex(String.Concat(pre, "lawngreen"), RegexOptions.IgnoreCase), "#7cfc00"))
        colors.Add("lemonchiffon", New CssColorReplacement(New Regex(String.Concat(pre, "lemonchiffon"), RegexOptions.IgnoreCase), "#fffacd"))
        colors.Add("lightblue", New CssColorReplacement(New Regex(String.Concat(pre, "lightblue"), RegexOptions.IgnoreCase), "#add8e6"))
        colors.Add("lightcoral", New CssColorReplacement(New Regex(String.Concat(pre, "lightcoral"), RegexOptions.IgnoreCase), "#f08080"))
        colors.Add("lightcyan", New CssColorReplacement(New Regex(String.Concat(pre, "lightcyan"), RegexOptions.IgnoreCase), "#e0ffff"))
        colors.Add("lightgoldenrodyellow", New CssColorReplacement(New Regex(String.Concat(pre, "lightgoldenrodyellow"), RegexOptions.IgnoreCase), "#fafad2"))
        colors.Add("lightgreen", New CssColorReplacement(New Regex(String.Concat(pre, "lightgreen"), RegexOptions.IgnoreCase), "#90ee90"))
        colors.Add("lightgrey", New CssColorReplacement(New Regex(String.Concat(pre, "lightgrey"), RegexOptions.IgnoreCase), "#d3d3d3"))
        colors.Add("lightpink", New CssColorReplacement(New Regex(String.Concat(pre, "lightpink"), RegexOptions.IgnoreCase), "#ffb6c1"))
        colors.Add("lightsalmon", New CssColorReplacement(New Regex(String.Concat(pre, "lightsalmon"), RegexOptions.IgnoreCase), "#ffa07a"))
        colors.Add("lightseagreen", New CssColorReplacement(New Regex(String.Concat(pre, "lightseagreen"), RegexOptions.IgnoreCase), "#20b2aa"))
        colors.Add("lightskyblue", New CssColorReplacement(New Regex(String.Concat(pre, "lightskyblue"), RegexOptions.IgnoreCase), "#87cefa"))
        colors.Add("lightslategray", New CssColorReplacement(New Regex(String.Concat(pre, "lightslategray"), RegexOptions.IgnoreCase), "#789"))
        colors.Add("lightsteelblue", New CssColorReplacement(New Regex(String.Concat(pre, "lightsteelblue"), RegexOptions.IgnoreCase), "#b0c4de"))
        colors.Add("lightyellow", New CssColorReplacement(New Regex(String.Concat(pre, "lightyellow"), RegexOptions.IgnoreCase), "#ffffe0"))
        colors.Add("limegreen", New CssColorReplacement(New Regex(String.Concat(pre, "limegreen"), RegexOptions.IgnoreCase), "#32cd32"))
        colors.Add("mediumaquamarine", New CssColorReplacement(New Regex(String.Concat(pre, "mediumaquamarine"), RegexOptions.IgnoreCase), "#66cdaa"))
        colors.Add("mediumblue", New CssColorReplacement(New Regex(String.Concat(pre, "mediumblue"), RegexOptions.IgnoreCase), "#0000cd"))
        colors.Add("mediumorchid", New CssColorReplacement(New Regex(String.Concat(pre, "mediumorchid"), RegexOptions.IgnoreCase), "#ba55d3"))
        colors.Add("mediumpurple", New CssColorReplacement(New Regex(String.Concat(pre, "mediumpurple"), RegexOptions.IgnoreCase), "#9370db"))
        colors.Add("mediumseagreen", New CssColorReplacement(New Regex(String.Concat(pre, "mediumseagreen"), RegexOptions.IgnoreCase), "#3cb371"))
        colors.Add("mediumslateblue", New CssColorReplacement(New Regex(String.Concat(pre, "mediumslateblue"), RegexOptions.IgnoreCase), "#7b68ee"))
        colors.Add("mediumspringgreen", New CssColorReplacement(New Regex(String.Concat(pre, "mediumspringgreen"), RegexOptions.IgnoreCase), "#00fa9a"))
        colors.Add("mediumturquoise", New CssColorReplacement(New Regex(String.Concat(pre, "mediumturquoise"), RegexOptions.IgnoreCase), "#48d1cc"))
        colors.Add("mediumvioletred", New CssColorReplacement(New Regex(String.Concat(pre, "mediumvioletred"), RegexOptions.IgnoreCase), "#c71585"))
        colors.Add("midnightblue", New CssColorReplacement(New Regex(String.Concat(pre, "midnightblue"), RegexOptions.IgnoreCase), "#191970"))
        colors.Add("mintcream", New CssColorReplacement(New Regex(String.Concat(pre, "mintcream"), RegexOptions.IgnoreCase), "#f5fffa"))
        colors.Add("mistyrose", New CssColorReplacement(New Regex(String.Concat(pre, "mistyrose"), RegexOptions.IgnoreCase), "#ffe4e1"))
        colors.Add("moccasin", New CssColorReplacement(New Regex(String.Concat(pre, "moccasin"), RegexOptions.IgnoreCase), "#ffe4b5"))
        colors.Add("navajowhite", New CssColorReplacement(New Regex(String.Concat(pre, "navajowhite"), RegexOptions.IgnoreCase), "#ffdead"))
        colors.Add("navyblue", New CssColorReplacement(New Regex(String.Concat(pre, "navyblue"), RegexOptions.IgnoreCase), "#9fafdf"))
        colors.Add("olivedrab", New CssColorReplacement(New Regex(String.Concat(pre, "olivedrab"), RegexOptions.IgnoreCase), "#6b8e23"))
        colors.Add("orangered", New CssColorReplacement(New Regex(String.Concat(pre, "orangered"), RegexOptions.IgnoreCase), "#ff4500"))
        colors.Add("palegoldenrod", New CssColorReplacement(New Regex(String.Concat(pre, "palegoldenrod"), RegexOptions.IgnoreCase), "#eee8aa"))
        colors.Add("palegreen", New CssColorReplacement(New Regex(String.Concat(pre, "palegreen"), RegexOptions.IgnoreCase), "#98fb98"))
        colors.Add("paleturquoise", New CssColorReplacement(New Regex(String.Concat(pre, "paleturquoise"), RegexOptions.IgnoreCase), "#afeeee"))
        colors.Add("palevioletred", New CssColorReplacement(New Regex(String.Concat(pre, "palevioletred"), RegexOptions.IgnoreCase), "#db7093"))
        colors.Add("papayawhip", New CssColorReplacement(New Regex(String.Concat(pre, "papayawhip"), RegexOptions.IgnoreCase), "#ffefd5"))
        colors.Add("peachpuff", New CssColorReplacement(New Regex(String.Concat(pre, "peachpuff"), RegexOptions.IgnoreCase), "#ffdab9"))
        colors.Add("powderblue", New CssColorReplacement(New Regex(String.Concat(pre, "powderblue"), RegexOptions.IgnoreCase), "#b0e0e6"))
        colors.Add("rosybrown", New CssColorReplacement(New Regex(String.Concat(pre, "rosybrown"), RegexOptions.IgnoreCase), "#bc8f8f"))
        colors.Add("royalblue", New CssColorReplacement(New Regex(String.Concat(pre, "royalblue"), RegexOptions.IgnoreCase), "#4169e1"))
        colors.Add("saddlebrown", New CssColorReplacement(New Regex(String.Concat(pre, "saddlebrown"), RegexOptions.IgnoreCase), "#8b4513"))
        colors.Add("sandybrown", New CssColorReplacement(New Regex(String.Concat(pre, "sandybrown"), RegexOptions.IgnoreCase), "#f4a460"))
        colors.Add("seashell", New CssColorReplacement(New Regex(String.Concat(pre, "seashell"), RegexOptions.IgnoreCase), "#fff5ee"))
        colors.Add("whitesmoke", New CssColorReplacement(New Regex(String.Concat(pre, "whitesmoke"), RegexOptions.IgnoreCase), "#f5f5f5"))
        colors.Add("yellowgreen", New CssColorReplacement(New Regex(String.Concat(pre, "yellowgreen"), RegexOptions.IgnoreCase), "#9acd32"))

        'Colors that are shorter as hex strings, but need to be substituted last because they are partial macthes for other color names
        colors.Add("goldenrod", New CssColorReplacement(New Regex(String.Concat(pre, "goldenrod"), RegexOptions.IgnoreCase), "#daa520"))
        colors.Add("lavender", New CssColorReplacement(New Regex(String.Concat(pre, "lavender"), RegexOptions.IgnoreCase), "#e6e6fa"))
        colors.Add("magenta", New CssColorReplacement(New Regex(String.Concat(pre, "magenta"), RegexOptions.IgnoreCase), "#f0f"))
        colors.Add("seagreen", New CssColorReplacement(New Regex(String.Concat(pre, "seagreen"), RegexOptions.IgnoreCase), "#2e8b57"))
        colors.Add("slateblue", New CssColorReplacement(New Regex(String.Concat(pre, "slateblue"), RegexOptions.IgnoreCase), "#6a5acd"))
        colors.Add("slategray", New CssColorReplacement(New Regex(String.Concat(pre, "slategray"), RegexOptions.IgnoreCase), "#708090"))
        colors.Add("springgreen", New CssColorReplacement(New Regex(String.Concat(pre, "springgreen"), RegexOptions.IgnoreCase), "#00ff7f"))
        colors.Add("steelblue", New CssColorReplacement(New Regex(String.Concat(pre, "steelblue"), RegexOptions.IgnoreCase), "#4682b4"))
        colors.Add("turquoise", New CssColorReplacement(New Regex(String.Concat(pre, "turquoise"), RegexOptions.IgnoreCase), "#40e0d0"))
        colors.Add("white", New CssColorReplacement(New Regex(String.Concat(pre, "white"), RegexOptions.IgnoreCase), "#fff"))
        colors.Add("yellow", New CssColorReplacement(New Regex(String.Concat(pre, "yellow"), RegexOptions.IgnoreCase), "#ff0"))

        'Colors that are shorter as CSS names
        colors.Add("#f0ffff", New CssColorReplacement(New Regex(String.Concat(pre, "#f0ffff"), RegexOptions.IgnoreCase), "azure"))
        colors.Add("#f5f5dc", New CssColorReplacement(New Regex(String.Concat(pre, "#f5f5dc"), RegexOptions.IgnoreCase), "beige"))
        colors.Add("#ffe4c4", New CssColorReplacement(New Regex(String.Concat(pre, "#ffe4c4"), RegexOptions.IgnoreCase), "bisque"))
        colors.Add("#a52a2a", New CssColorReplacement(New Regex(String.Concat(pre, "#a52a2a"), RegexOptions.IgnoreCase), "brown"))
        colors.Add("#ff7f50", New CssColorReplacement(New Regex(String.Concat(pre, "#ff7f50"), RegexOptions.IgnoreCase), "coral"))
        colors.Add("#ffd700", New CssColorReplacement(New Regex(String.Concat(pre, "#ffd700"), RegexOptions.IgnoreCase), "gold"))
        colors.Add("#808080", New CssColorReplacement(New Regex(String.Concat(pre, "#808080"), RegexOptions.IgnoreCase), "gray"))
        colors.Add("#008000", New CssColorReplacement(New Regex(String.Concat(pre, "#008000"), RegexOptions.IgnoreCase), "green"))
        colors.Add("#4b0082", New CssColorReplacement(New Regex(String.Concat(pre, "#4b0082"), RegexOptions.IgnoreCase), "indigo"))
        colors.Add("#fffff0", New CssColorReplacement(New Regex(String.Concat(pre, "#fffff0"), RegexOptions.IgnoreCase), "ivory"))
        colors.Add("#f0e68c", New CssColorReplacement(New Regex(String.Concat(pre, "#f0e68c"), RegexOptions.IgnoreCase), "khaki"))
        colors.Add("#faf0e6", New CssColorReplacement(New Regex(String.Concat(pre, "#faf0e6"), RegexOptions.IgnoreCase), "linen"))
        colors.Add("#800000", New CssColorReplacement(New Regex(String.Concat(pre, "#800000"), RegexOptions.IgnoreCase), "maroon"))
        colors.Add("#000080", New CssColorReplacement(New Regex(String.Concat(pre, "#000080"), RegexOptions.IgnoreCase), "navy"))
        colors.Add("#808000", New CssColorReplacement(New Regex(String.Concat(pre, "#808000"), RegexOptions.IgnoreCase), "olive"))
        colors.Add("#ffa500", New CssColorReplacement(New Regex(String.Concat(pre, "#ffa500"), RegexOptions.IgnoreCase), "orange"))
        colors.Add("#da70d6", New CssColorReplacement(New Regex(String.Concat(pre, "#da70d6"), RegexOptions.IgnoreCase), "orchid"))
        colors.Add("#cd853f", New CssColorReplacement(New Regex(String.Concat(pre, "#cd853f"), RegexOptions.IgnoreCase), "peru"))
        colors.Add("#ffc0cb", New CssColorReplacement(New Regex(String.Concat(pre, "#ffc0cb"), RegexOptions.IgnoreCase), "pink"))
        colors.Add("#dda0dd", New CssColorReplacement(New Regex(String.Concat(pre, "#dda0dd"), RegexOptions.IgnoreCase), "plum"))
        colors.Add("#800080", New CssColorReplacement(New Regex(String.Concat(pre, "#800080"), RegexOptions.IgnoreCase), "purple"))
        colors.Add("#f00", New CssColorReplacement(New Regex(String.Concat(pre, "#f00"), RegexOptions.IgnoreCase), "red"))
        colors.Add("#fa8072", New CssColorReplacement(New Regex(String.Concat(pre, "#fa8072"), RegexOptions.IgnoreCase), "salmon"))
        colors.Add("#a0522d", New CssColorReplacement(New Regex(String.Concat(pre, "#a0522d"), RegexOptions.IgnoreCase), "sienna"))
        colors.Add("#c0c0c0", New CssColorReplacement(New Regex(String.Concat(pre, "#c0c0c0"), RegexOptions.IgnoreCase), "silver"))
        colors.Add("#fffafa", New CssColorReplacement(New Regex(String.Concat(pre, "#fffafa"), RegexOptions.IgnoreCase), "snow"))
        colors.Add("#d2b48c", New CssColorReplacement(New Regex(String.Concat(pre, "#d2b48c"), RegexOptions.IgnoreCase), "tan"))
        colors.Add("#008080", New CssColorReplacement(New Regex(String.Concat(pre, "#008080"), RegexOptions.IgnoreCase), "teal"))
        colors.Add("#ff6347", New CssColorReplacement(New Regex(String.Concat(pre, "#ff6347"), RegexOptions.IgnoreCase), "tomato"))
        colors.Add("#ee82ee", New CssColorReplacement(New Regex(String.Concat(pre, "#ee82ee"), RegexOptions.IgnoreCase), "violet"))
        colors.Add("#f5deb3", New CssColorReplacement(New Regex(String.Concat(pre, "#f5deb3"), RegexOptions.IgnoreCase), "wheat"))

        'Colors that are only case-corrected
        'aqua, blue, crimson, cyan, darkred, dimgray, hotpink, lime, oldlace, skyblue, thistle

        Return colors
    End Function

End Class