diff --git a/src/rules.js b/src/rules.js
index d3175e8ba0..a06bdb6892 100644
--- a/src/rules.js
+++ b/src/rules.js
@@ -21,9 +21,9 @@ const block = {
     + '|<\\?[\\s\\S]*?(?:\\?>\\n*|$)' // (3)
     + '|<![A-Z][\\s\\S]*?(?:>\\n*|$)' // (4)
     + '|<!\\[CDATA\\[[\\s\\S]*?(?:\\]\\]>\\n*|$)' // (5)
-    + '|</?(tag)(?: +|\\n|/?>)[\\s\\S]*?(?:\\n{2,}|$)' // (6)
-    + '|<(?!script|pre|style)([a-z][\\w-]*)(?:attribute)*? */?>(?=[ \\t]*(?:\\n|$))[\\s\\S]*?(?:\\n{2,}|$)' // (7) open tag
-    + '|</(?!script|pre|style)[a-z][\\w-]*\\s*>(?=[ \\t]*(?:\\n|$))[\\s\\S]*?(?:\\n{2,}|$)' // (7) closing tag
+    + '|</?(tag)(?: +|\\n|/?>)[\\s\\S]*?(?:(?:\\n *)+\\n|$)' // (6)
+    + '|<(?!script|pre|style)([a-z][\\w-]*)(?:attribute)*? */?>(?=[ \\t]*(?:\\n|$))[\\s\\S]*?(?:(?:\\n *)+\\n|$)' // (7) open tag
+    + '|</(?!script|pre|style)[a-z][\\w-]*\\s*>(?=[ \\t]*(?:\\n|$))[\\s\\S]*?(?:(?:\\n *)+\\n|$)' // (7) closing tag
     + ')',
   def: /^ {0,3}\[(label)\]: *\n? *<?([^\s>]+)>?(?:(?: +\n? *| *\n *)(title))? *(?:\n+|$)/,
   nptable: noopTest,
diff --git a/test/specs/new/indented_details.html b/test/specs/new/indented_details.html
new file mode 100644
index 0000000000..910ff957c1
--- /dev/null
+++ b/test/specs/new/indented_details.html
@@ -0,0 +1,24 @@
+<details>
+
+<h2 id="heading">Heading</h2>
+</details>
+
+<h2 id="heading-1">Heading</h2>
+<custom-tag>
+
+<h2 id="heading-2">Heading</h2>
+</custom-tag>
+
+<h2 id="heading-3">Heading</h2>
+<details>
+
+<pre><code>## Heading</code></pre>
+</details>
+
+<pre><code>## Heading</code></pre>
+<custom-tag>
+
+<pre><code>## Heading</code></pre>
+</custom-tag>
+
+<pre><code>## Heading</code></pre>
diff --git a/test/specs/new/indented_details.md b/test/specs/new/indented_details.md
new file mode 100644
index 0000000000..5b838ca17b
--- /dev/null
+++ b/test/specs/new/indented_details.md
@@ -0,0 +1,24 @@
+<details>
+  
+  ## Heading
+</details>
+  
+  ## Heading
+<custom-tag>
+  
+  ## Heading
+</custom-tag>
+  
+  ## Heading
+<details>
+	
+	## Heading
+</details>
+	
+	## Heading
+<custom-tag>
+	
+	## Heading
+</custom-tag>
+	
+	## Heading