diff --git a/Michelf/Markdown.php b/Michelf/Markdown.php
index 43b3c79..9cf4c77 100644
--- a/Michelf/Markdown.php
+++ b/Michelf/Markdown.php
@@ -354,7 +354,7 @@ class Markdown implements MarkdownInterface {
 		$block_tags_b_re = 'p|div|h[1-6]|blockquote|pre|table|dl|ol|ul|address|'.
 						   'script|noscript|style|form|fieldset|iframe|math|svg|'.
 						   'article|section|nav|aside|hgroup|header|footer|'.
-						   'figure';
+						   'figure|details|summary';
 
 		// Regular expression for the content of a block tag.
 		$nested_tags_level = 4;
diff --git a/Michelf/MarkdownExtra.php b/Michelf/MarkdownExtra.php
index cf5b788..462adab 100644
--- a/Michelf/MarkdownExtra.php
+++ b/Michelf/MarkdownExtra.php
@@ -345,7 +345,7 @@ class MarkdownExtra extends \Michelf\Markdown {
 	 * Tags that are always treated as block tags
 	 * @var string
 	 */
-	protected $block_tags_re = 'p|div|h[1-6]|blockquote|pre|table|dl|ol|ul|address|form|fieldset|iframe|hr|legend|article|section|nav|aside|hgroup|header|footer|figcaption|figure';
+	protected $block_tags_re = 'p|div|h[1-6]|blockquote|pre|table|dl|ol|ul|address|form|fieldset|iframe|hr|legend|article|section|nav|aside|hgroup|header|footer|figcaption|figure|details|summary';
 
 	/**
 	 * Tags treated as block tags only if the opening tag is alone on its line
diff --git a/test/resources/php-markdown.mdtest/Inline HTML (Simple).html b/test/resources/php-markdown.mdtest/Inline HTML (Simple).html
index 1451d62..efb6763 100644
--- a/test/resources/php-markdown.mdtest/Inline HTML (Simple).html	
+++ b/test/resources/php-markdown.mdtest/Inline HTML (Simple).html	
@@ -14,6 +14,13 @@
 <hr class="foo"
     id="bar" >
 
+<p>Details and Summary:</p>
+
+<details>
+  <summary>Some details</summary>
+  <p>More info about the details.</p>
+</details>
+
 <p>Regression:</p>
 
 <pre>
diff --git a/test/resources/php-markdown.mdtest/Inline HTML (Simple).text b/test/resources/php-markdown.mdtest/Inline HTML (Simple).text
index 359b622..7b67dde 100644
--- a/test/resources/php-markdown.mdtest/Inline HTML (Simple).text	
+++ b/test/resources/php-markdown.mdtest/Inline HTML (Simple).text	
@@ -14,6 +14,13 @@ Hr's:
 <hr class="foo"
     id="bar" >
 
+Details and Summary:
+
+<details>
+  <summary>Some details</summary>
+  <p>More info about the details.</p>
+</details>
+
 Regression:
 
 <pre>