diff --git a/playground/ajax.php b/playground/ajax.php
new file mode 100644
index 0000000..34f59fe
--- /dev/null
+++ b/playground/ajax.php
@@ -0,0 +1,35 @@
+<?php declare(strict_types=1);
+
+require __DIR__."/../vendor/autoload.php";
+
+$source = file_get_contents("php://input");
+
+try {
+	$Instance = new parkdown\Parkdown($source, true);
+	echo $Instance->html();
+} catch (parkdown\ParserError $error) {
+	echo "<pre>";
+
+	$message     = explode(" ", $error->getMessage());
+	$location    = array_shift($message);
+	$loc         = explode(":", $location);
+	$file        = array_shift($loc);
+	$line        = substr(implode(":", $loc), 0, -1);
+	[$row, $col] = explode(":", $line);
+
+	echo "<a class='error' href=\"javascript: highlight($col, $row);\">$location</a> ".implode(" ", $message);
+
+	
+	$stackTrace = explode("\n", $error->getTraceAsString());
+
+	echo "<p><small>";
+		foreach ($stackTrace as $step) {
+			$step = explode(" ", $step);
+			array_shift($step);
+			$location = array_shift($step);
+			$location = preg_replace("/\(([0-9]+)\):/", ":\$1:", $location);
+
+			echo "<a class='error' href='vscode://file/".substr($location, 0, -1)."'>$location</a> ".implode(" ", $step)."<br>";
+		}
+	echo "</small></p>";
+}
\ No newline at end of file
diff --git a/playground/index.php b/playground/index.php
new file mode 100644
index 0000000..a933707
--- /dev/null
+++ b/playground/index.php
@@ -0,0 +1,204 @@
+<!DOCTYPE html>
+<html lang="en">
+<head>
+	<meta charset="UTF-8">
+	<meta name="viewport" content="width=device-width, initial-scale=1.0">
+	<title>parkdown playground</title>
+	<script type="module">
+		const $ = selector => {
+			const elements = document.querySelectorAll(selector);
+
+			return elements.length < 2 ? elements[0] : elements;
+		};
+
+		const output  = $("#output");
+		const input   = $("#input");
+		const numbers = $(".linenumbers");
+		let timeout;
+
+		const updateOutput = (event) => {
+			const text  = event ? event.target.value : input.value;
+			const lines = text.split("\n").length;
+			let   html  = "";
+			for (let i = 1; i <= lines; i++) {
+				html += `${i}<br>`;
+			}
+			numbers.innerHTML = html;
+
+			timeout = setTimeout(() => {
+
+				fetch("ajax.php", {
+					method : "POST",
+					headers: {
+						"Content-Type" : "application/json"
+					},
+					body : text
+				}).then(response => response.text()).then(text => output.innerHTML = text);
+			}, 1000);
+		}
+
+		document.addEventListener("DOMContentLoaded", () => {
+			updateOutput();
+
+			input.addEventListener("keydown", event => {
+				if (event.key !== "Tab")
+					return;
+				event.preventDefault();
+				const start = input.selectionStart;
+				const end   = input.selectionEnd;
+				const value = input.value;
+
+				input.value = value.substring(0, start) + "\t" + value.substring(end);
+				input.selectionStart = input.selectionEnd = (start + 1);
+			});
+
+			input.addEventListener("input", event => {
+				clearTimeout(timeout);
+				updateOutput(event);
+			});
+		});
+
+		window.highlight = (col, row) => {
+			const lines = input.value.split("\n");
+
+			let start = 0;
+			let end   = 0;
+			let i     = 0;
+
+			for (const line of lines) {
+				if (++i === row) {
+					end = start + line.length;
+					break;
+				}
+				start += line.length + 1;
+			}
+
+			start = start + col - 1 === end ? start : start + col;
+
+			input.focus();
+			input.setSelectionRange(start, end);
+			const lineHeight       = input.clientHeight / lines.length;
+			$(".editor").scrollTop = lineHeight * (row - 10);
+			input.scrollLeft       = 0;
+		};
+	</script>
+	<style rel="stylesheet">
+		* {
+			box-sizing: border-box;
+			outline: 0 !important;
+		}
+
+		a {
+			color: dodgerblue;
+			text-decoration: none;
+		}
+		a:hover {
+			text-decoration: underline;
+		}
+		a.error {
+			color: palevioletred;
+		}
+
+		body {
+			display: grid;
+			grid-template-columns: 1fr 1fr;
+			font-family: sans-serif;
+			margin: 0;
+			padding: 0;
+			height: 100vh;
+			overflow: hidden;
+			background: #333;
+			color: #eee;
+		}
+
+		body > * {
+			width: 100%;
+			border: solid 1px #111;
+			padding: 0;
+			margin: 0;
+		}
+
+		textarea {
+			width: 100%;
+			height: 100%;
+			font-family: monospace;
+			box-sizing: content-box;
+			background: transparent;
+			tab-size: 4;
+			border: none;
+			padding-bottom: 4rem;
+			font-size: 1.2rem;
+			overflow-y: clip;
+			overflow-x: scroll;
+			white-space: nowrap;
+			resize: none;
+			margin: 1rem 0;
+			color: #FAF08B;
+		}
+		textarea::selection {
+			background-color: dodgerblue;
+			color: white;
+		}
+
+		.editor {
+			display: grid;
+			grid-template-columns: 80px auto;
+			gap: 2rem;
+			height: 100%;
+			border-right: none;
+			overflow-y: auto;
+			overflow-x: hidden;
+		}
+		
+		.linenumbers {
+			font-size: 1.2rem;
+			text-align: right;
+			padding: 1rem;
+			color: #aaa;
+			font-family: monospace;
+			background: #222;
+		}
+
+		#output {
+			overflow-y: auto;
+			padding: 4rem;
+		}
+
+		::-webkit-scrollbar {
+			background-color: transparent;
+			width: 16px;
+		}
+		::-webkit-scrollbar-track {
+			background-color: transparent;
+		}
+		::-webkit-scrollbar-thumb {
+			background-color: rgba(255,255,255,0.1);
+			border-radius: 16px;
+			border: 4px solid #333;
+		}
+		::-webkit-scrollbar-button {
+			display:none;
+		}
+	</style>
+</head>
+<body>
+	
+<section class="editor">
+	<section class="linenumbers">1</section>
+	<textarea id="input">
+# parkdown playground
+
+![parkdown logo](https://git.mike-ochmann.de/MassiveDynamic/Parkdown/raw/branch/master/docs/logo_parkdown.svg)
+
+* use markdown in the editor
+* view result over there
+
+View parkdown code [here][code].
+
+[code]: https://git.mike-ochmann.de/MassiveDynamic/Parkdown
+	</textarea>
+</section>
+<section id="output"></section>
+
+</body>
+</html>
\ No newline at end of file
