public static CssValue Font_Weight_Computed(ICssProperty Property)
        {/* Docs: https://drafts.csswg.org/css-fonts-4/#valdef-font-weight-bolder */
            if (Property == null)
            {
                throw new ArgumentNullException(nameof(Property));
            }
            Contract.EndContractBlock();

            // handle font-weight related keywords
            // This function wouldnt even be called if the value werent a keyword
            var keyword = (Property as CssProperty).Specified.AsEnum <EFontWeight>();
            int Weight  = 400;

            switch (keyword)
            {
            case EFontWeight.Normal:
                Weight = 400;
                break;

            case EFontWeight.Bold:
                Weight = 700;
                break;

            case EFontWeight.Bolder:
            {        /* Docs: https://drafts.csswg.org/css-fonts-4/#relative-weights */
                CssValue inherited = Property.Find_Inherited_Value();
                int      w         = inherited.AsInteger();

                if (w < 100)
                {
                    Weight = 400;
                }
                else if (w >= 100 && w < 350)
                {
                    Weight = 400;
                }
                else if (w >= 350 && w < 550)
                {
                    Weight = 700;
                }
                else if (w >= 550 && w < 750)
                {
                    Weight = 900;
                }
                else if (w >= 750 && w < 900)
                {
                    Weight = 900;
                }
                else
                {
                    Weight = 900;
                }
            }
            break;

            case EFontWeight.Lighter:
            {        /* Docs: https://drafts.csswg.org/css-fonts-4/#relative-weights */
                CssValue inherited = Property.Find_Inherited_Value();
                int      w         = inherited.AsInteger();

                if (w < 100)
                {
                    Weight = 100;
                }
                else if (w >= 100 && w < 350)
                {
                    Weight = 100;
                }
                else if (w >= 350 && w < 550)
                {
                    Weight = 100;
                }
                else if (w >= 550 && w < 750)
                {
                    Weight = 400;
                }
                else if (w >= 750 && w < 900)
                {
                    Weight = 700;
                }
                else
                {
                    Weight = 700;
                }
            }
            break;
            }

            return(CssValue.From(Weight));
        }