Markdig Sample https://github.com/lunet-io/markdig

output.html

<h2 id="table">Table</h2>
<table>
<thead>
<tr>
<th style="text-align: right;">Right</th>
<th style="text-align: left;">Left</th>
<th>Default</th>
<th style="text-align: center;">Center</th>
</tr>
</thead>
<tbody>
<tr>
<td style="text-align: right;">12</td>
<td style="text-align: left;">12</td>
<td>12</td>
<td style="text-align: center;">12</td>
</tr>
<tr>
<td style="text-align: right;">123</td>
<td style="text-align: left;">123</td>
<td>123</td>
<td style="text-align: center;">123</td>
</tr>
<tr>
<td style="text-align: right;">1</td>
<td style="text-align: left;">1</td>
<td>1</td>
<td style="text-align: center;">1</td>
</tr>
</tbody>
</table>
<table>
<col style="width:30%">
<col style="width:30%">
<col style="width:40%">
<thead>
<tr>
<th>Fruit</th>
<th>Price</th>
<th>Advantages</th>
</tr>
</thead>
<tbody>
<tr>
<td>Bananas</td>
<td>$1.34</td>
<td>
<ul>
<li>built-in wrapper</li>
<li>bright color</li>
</ul>
</td>
</tr>
<tr>
<td>Oranges</td>
<td>$2.10</td>
<td>
<ul>
<li>cures scurvy</li>
<li>tasty</li>
</ul>
</td>
</tr>
</tbody>
</table>
<h2 id="header-identifiers-in-html">Header Identifiers in HTML</h2>
<p><a href="#header-identifiers-in-html-given">Header identifiers in HTML</a></p>
<ul class="contains-task-list">
<li class="task-list-item"><input disabled="disabled" type="checkbox" /> a task list item</li>
<li class="task-list-item"><input disabled="disabled" type="checkbox" /> list syntax required</li>
<li class="task-list-item"><input disabled="disabled" type="checkbox" /> normal <strong>formatting</strong>, @mentions, #1234 refs</li>
<li class="task-list-item"><input disabled="disabled" type="checkbox" /> incomplete</li>
<li class="task-list-item"><input disabled="disabled" type="checkbox" checked="checked" /> completed</li>
</ul>
<p><customTag></customTag></p>
<div><aa:customTag></aa:customTag></div>

UseMarkdig.cs

using System;
using Markdig;

namespace ConsoleApplication2
{
    class Program
    {
        static void Main(string[] args)
        {
            string input = @"

## Table

| Right | Left | Default | Center |
|------:|:-----|---------|:------:|
|   12  |  12  |    12   |    12  |
|  123  |  123 |   123   |   123  |
|    1  |    1 |     1   |     1  |


+---------------+---------------+--------------------+
| Fruit         | Price         | Advantages         |
+===============+===============+====================+
| Bananas       | $1.34         | - built-in wrapper |
|               |               | - bright color     |
+---------------+---------------+--------------------+
| Oranges       | $2.10         | - cures scurvy     |
|               |               | - tasty            |
+---------------+---------------+--------------------+

## Header Identifiers in HTML

[Header identifiers in HTML](#header-identifiers-in-html-given)


- [ ] a task list item
- [ ] list syntax required
- [ ] normal **formatting**, @mentions, #1234 refs
- [ ] incomplete
- [x] completed

<customTag></customTag>
<div><aa:customTag></aa:customTag></div>

";

            var pipeline = new Markdig.MarkdownPipelineBuilder().UseAdvancedExtensions().Build();
            var result = Markdig.Markdown.ToHtml(input, pipeline);

            Console.WriteLine(result);
        }
    }
}