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Here you can Sed posuere consectetur est at lobortis. Donec ullamcorper nulla non metus auctor fringilla. Maecenas sed diam eget risus varius blandit sit amet non magna. Donec id elit non mi porta gravida at eget metus. Praesent commodo cursus magna, vel scelerisque nisl consectetur et.


                <textarea id="editor" placeholder="Makdoun変換対応"></textarea><br>
<textarea placeholder="非対応"></textarea>


                textarea {
	width: 400px;
	height: 200px;




var editor = document.getElementById("editor");

function columnWidth(rows, columnIndex) {
	return Math.max.apply(
		null, (row) {
			return row[columnIndex].length;

function looksLikeTable(data) {
	return true;

editor.addEventListener("paste", function (event) {
	var clipboard = event.clipboardData;
	var data = clipboard.getData("text/plain").trim();

	if (looksLikeTable(data)) {
	} else {

	var rows = data.split(/[\n\u0085\u2028\u2029]|\r\n?/g).map(function (row) {
		return row.split("\t");
	var columnWidths = rows[0].map(function (column, columnIndex) {
		return columnWidth(rows, columnIndex);
	var markdownRows = (row, rowIndex) {
		// | Name         | Title | Email Address  |
		// |--------------|-------|----------------|
		// | Jane Atler   | CEO   |  |
		// | John Doherty | CTO   |  |
		// | Sally Smith  | CFO   | |
		return (
			"| " +
				.map(function (column, index) {
					return column + Array(columnWidths[index] - column.length + 1).join(" ");
				.join(" | ") +
			" |"
		"|" +
				.map(function (width, index) {
					return Array(columnWidths[index] + 3).join("-");
				.join("|") +

	// When pasting, the drag data store mode flag is read-only, hence calling
	// setData() from a paste event handler will not modify the data that is
	// inserted, and not modify the data on the clipboard. = markdownRows.join("\n");
	return false;