diff --git a/src/subParsers/makehtml/hashHTMLBlocks.js b/src/subParsers/makehtml/hashHTMLBlocks.js
index 9019017d..605886c9 100644
--- a/src/subParsers/makehtml/hashHTMLBlocks.js
+++ b/src/subParsers/makehtml/hashHTMLBlocks.js
@@ -36,6 +36,7 @@ showdown.subParser('makehtml.hashHTMLBlocks', function (text, options, globals)
         'hgroup',
         'output',
         'video',
+        'details',
         'p'
       ],
       repFunc = function (wholeMatch, match, left, right) {
diff --git a/test/functional/makehtml/cases/standard/html5-strutural-tags.html b/test/functional/makehtml/cases/standard/html5-strutural-tags.html
index f054d42c..2374788f 100644
--- a/test/functional/makehtml/cases/standard/html5-strutural-tags.html
+++ b/test/functional/makehtml/cases/standard/html5-strutural-tags.html
@@ -55,3 +55,7 @@ <h1>Main title</h1>
   <h2>Secondary title</h2>
 </hgroup>
 <output name="result"></output>
+<details>
+  <summary>Summarise me</summary>
+  <p>Explain the details</p>
+</details>
diff --git a/test/functional/makehtml/cases/standard/html5-strutural-tags.md b/test/functional/makehtml/cases/standard/html5-strutural-tags.md
index bbf9c677..33ec68db 100644
--- a/test/functional/makehtml/cases/standard/html5-strutural-tags.md
+++ b/test/functional/makehtml/cases/standard/html5-strutural-tags.md
@@ -66,3 +66,8 @@ the end
 </hgroup>
 
 <output name="result"></output>
+
+<details>
+  <summary>Summarise me</summary>
+  <p>Explain the details</p>
+</details>
diff --git a/test/functional/makemarkdown/cases/standard/html5-strutural-tags.html b/test/functional/makemarkdown/cases/standard/html5-strutural-tags.html
index 9437a876..6697a022 100644
--- a/test/functional/makemarkdown/cases/standard/html5-strutural-tags.html
+++ b/test/functional/makemarkdown/cases/standard/html5-strutural-tags.html
@@ -32,3 +32,7 @@ <h1>Main title</h1>
   <h2>Secondary title</h2>
 </hgroup>
 <output name="result"></output>
+<details>
+  <summary>Summarise me</summary>
+  <p>Explain the details</p>
+</details>
diff --git a/test/functional/makemarkdown/cases/standard/html5-strutural-tags.md b/test/functional/makemarkdown/cases/standard/html5-strutural-tags.md
index 3c6c7c8c..1262a449 100644
--- a/test/functional/makemarkdown/cases/standard/html5-strutural-tags.md
+++ b/test/functional/makemarkdown/cases/standard/html5-strutural-tags.md
@@ -31,3 +31,5 @@ the end
 <hgroup><h1>Main title</h1><h2>Secondary title</h2></hgroup>
 
 <output name="result"></output>
+
+<details><summary>Summarise me</summary><p>Explain the details</p></details>