Add unsafeHtml option for extensions to use on trusted input

test/ParsedownTest.php

@@ -1,4 +1,5 @@
 <?php
+require 'UnsafeExtension.php';
 
 use PHPUnit\Framework\TestCase;
 
@@ -55,6 +56,17 @@ class ParsedownTest extends TestCase
         $this->assertEquals($expectedMarkup, $actualMarkup);
     }
 
+    function testUnsafeHtml()
+    {
+        $markdown = "```php\nfoobar\n```";
+        $expectedMarkup = '<pre><code class="language-php"><p>foobar</p></code></pre>';
+
+        $unsafeExtension = new UnsafeExtension;
+        $actualMarkup = $unsafeExtension->text($markdown);
+
+        $this->assertEquals($expectedMarkup, $actualMarkup);
+    }
+
     function data()
     {
         $data = array();

test/UnsafeExtension.php

@@ -0,0 +1,14 @@
+<?php
+
+class UnsafeExtension extends Parsedown
+{
+    protected function blockFencedCodeComplete($Block)
+    {
+        $text = $Block['element']['text']['text'];
+        unset($Block['element']['text']['text']);
+
+        $Block['element']['text']['unsafeHtml'] = "<p>$text</p>";
+
+        return $Block;
+    }
+}