JSFiddle - React, Tailwind, and code Playground

HTML

<form class="form-inline">
    <div class="form-group">
        <input type="text" class="form-control" id="RGB" placeholder="RGB" />
    </div>
    <div class="form-group">
        <input type="text" class="form-control" id="sRGB" placeholder="sRGB" />
    </div>
</form>

JavaScript

function sRGBConvert(val) {
            val = val.toUpperCase();
            var r = 0;
            if (val.charCodeAt(1) > 60)
                r += (10 + val.charCodeAt(1) - 65) * 16;
            else
                r += (val.charCodeAt(1) - 48) * 16;

            if (val.charCodeAt(2) > 60)
                r += (10 + val.charCodeAt(2) - 65);
            else
                r += (val.charCodeAt(2) - 48);

            var g = 0;
            if (val.charCodeAt(3) > 60)
                g += (10 + val.charCodeAt(3) - 65) * 16;
            else
                g += (val.charCodeAt(3) - 48) * 16;

            if (val.charCodeAt(4) > 60)
                g += (10 + val.charCodeAt(4) - 65);
            else
                g += (val.charCodeAt(4) - 48);

            var b = 0;
            if (val.charCodeAt(5) > 60)
                b += (10 + val.charCodeAt(5) - 65) * 16;
            else
                b += (val.charCodeAt(5) - 48) * 16;

            if (val.charCodeAt(6) > 60)
                b += (10 + val.charCodeAt(6) - 65);
            else
                b += (val.charCodeAt(6) - 48);

            r /= 255.0;
            g /= 255.0;
            b /= 255.0;

            r = FixValue(r);
            g = FixValue(g);
            b = FixValue(b);

            r *= 255.0;
            g *= 255.0;
            b *= 255.0;

            val = "#";
            if ((r >> 4) > 9)
                val += String.fromCharCode((r >> 4) + 65 - 10);
            else
                val += String.fromCharCode((r >> 4) + 48);

            if ((r % 16) > 9)
                val += String.fromCharCode((r % 16) + 65 - 10);
            else
                val += String.fromCharCode((r % 16) + 48);

            if ((g >> 4) > 9)
                val += String.fromCharCode((g >> 4) + 65 - 10);
            else
                val += String.fromCharCode((g >> 4) + 48);

            if ((g % 16) > 9)
                val += String.fromCharCode((g % 16) + 65 - 10);
            else
          ...