Color not parsed correctly if rgb is not all lowercase

[mganss]

var html = @"<p style='color: RGB(0,17,0)'>Text</p>";
var parser = new HtmlParser(new HtmlParserOptions(), BrowsingContext.New(Configuration.Default.WithCss(new CssParserOptions())));
var dom = parser.ParseDocument(html);
var p = dom.QuerySelector("p");
var s = p.GetStyle();
var color = s.GetColor(); // -> ""

Perhaps this occurs because the dictionary here does not use a comparer that ignores case:

AngleSharp.Css/src/AngleSharp.Css/Parser/Micro/ColorParser.cs

Lines 11 to 20 in 248a870

	private static readonly Dictionary<String, Func<StringSource, Color?>> ColorFunctions = new Dictionary<String, Func<StringSource, Color?>>
	{
	{ FunctionNames.Rgb, ParseRgba },
	{ FunctionNames.Rgba, ParseRgba },
	{ FunctionNames.Hsl, ParseHsla },
	{ FunctionNames.Hsla, ParseHsla },
	{ FunctionNames.Gray, ParseGray },
	{ FunctionNames.Hwb, ParseHwba },
	{ FunctionNames.Hwba, ParseHwba },
	};

This was originally reported as mganss/HtmlSanitizer#340.

[FlorianRappl]

It's a good point. Right now everything is case sensitive, but actually function names (and color names) should be case insensitive:

See https://www.w3.org/TR/css-color-4/#resolving-sRGB-values.

[mganss]

Isn't it the other way around, i.e. it should be case insensitive (rgb and RgB are treated the same, case is ignored) and currently it's case sensitive (only lowercase works)?

[FlorianRappl]

Isn't it the other way around, i.e. it should be case insensitive (rgb and RgB are treated the same, case is ignored) and currently it's case sensitive (only lowercase works)?

Correct(ed) - that's what I meant.

[FlorianRappl]

Landed in devel.