TIO modified snippet

encodeInput.js

function encodeInput(encoding) {
	var input = document.getElementById("input");

	return input ? "&input=" + encoding(input.value) : "";
}

snippet.js

var snippet = (function () {
	var custom = {"05AB1E":1,"2sable":1,"Actually":1,"Convex":1,"GS2":1,"Jelly":1,"M":1,"pl":1,"Retina":1,"Seriously":1,"V":1},
		newlineCharCode = "\n".charCodeAt(0),
		alphaCharCode = "α".charCodeAt(0),
		omegaCharCode = "ω".charCodeAt(0),
		omicronCharCode = "ο".charCodeAt(0),
		fullwidthACharCode = "Ａ".charCodeAt(0),
		fullwidthZCharCode = "Ｚ".charCodeAt(0),
		otherCharcoalCharacters = "⁰¹²³⁴⁵⁶⁷⁸⁹\
⟦⟧⦃⦄«»⁺⁻×÷﹪∧∨¬⁼‹›\
←↑→↓↖↗↘↙\
↶↷⟲¿‽‖´·¤¦“”⎚¶…§⎇";
	function inCharcoalCodepage (character) {
		var charcode = character.charCodeAt(0);
		return (
			(charcode <= 128 && character != newlineCharCode) ||
			(charcode >= alphaCharCode && charcode <= omegaCharCode && charcode != omicronCharCode) ||
			(charcode >= fullwidthACharCode && charcode <= fullwidthZCharCode) ||
			otherCharcoalCharacters.includes(character)
		);
	}
	function charcoalLength (string) {
		var length = 0
		for (var i = 0; i < string.length; i++) {
			var character = string[i];
			if (inCharcoalCodepage(character))
				length++;
			else
				length += unescape(encodeURIComponent(character)).length;
		}
		return length;
	}
	return function () {
		permalink();
		var language = document.getElementById("lang").innerText,
			languageLink = document.getElementById("lang").href,
			code = document.getElementById("code").value,
			codeLength = language === "Charcoal" ?
				charcoalLength(code) :
				(
					custom[language] ?
						code :
						unescape(encodeURIComponent(code))
				).length;

		return "# [" + language + "](" + languageLink + "), " +
			codeLength + " byte" + (codeLength == 1 ? "" : "s") +
			"\n\n" + code.replace(/^/gm, '    ') + "\n\n[Try it online!](" + window.location.href + ")";
	}
})();