diff --git a/htmLawed.php b/htmLawed.php
index 66c8979..be61bf3 100755
--- a/htmLawed.php
+++ b/htmLawed.php
@@ -338,7 +338,7 @@ function hl_balance($t, $act=1, $parentEle='div')
   $invalidMomKidAr = array('a'=>array('a'=>1, 'address'=>1, 'button'=>1, 'details'=>1, 'embed'=>1, 'iframe'=>1, 'keygen'=>1, 'label'=>1, 'select'=>1, 'textarea'=>1), 'address'=>array('address'=>1, 'article'=>1, 'aside'=>1, 'footer'=>1, 'h1'=>1, 'h2'=>1, 'h3'=>1, 'h4'=>1, 'h5'=>1, 'h6'=>1, 'header'=>1, 'hgroup'=>1, 'keygen'=>1, 'nav'=>1, 'section'=>1), 'audio'=>array('audio'=>1, 'video'=>1), 'button'=>array('a'=>1, 'address'=>1, 'button'=>1, 'details'=>1, 'embed'=>1, 'iframe'=>1, 'keygen'=>1, 'label'=>1, 'select'=>1, 'textarea'=>1), 'dfn'=>array('dfn'=>1), 'fieldset'=>array('fieldset'=>1), 'footer'=>array('footer'=>1, 'header'=>1), 'form'=>array('form'=>1), 'header'=>array('footer'=>1, 'header'=>1), 'label'=>array('label'=>1), 'main'=>array('main'=>1), 'meter'=>array('meter'=>1), 'noscript'=>array('script'=>1), 'progress'=>array('progress'=>1), 'rb'=>array('ruby'=>1), 'rt'=>array('ruby'=>1), 'ruby'=>array('ruby'=>1), 'time'=>array('time'=>1), 'video'=>array('audio'=>1, 'video'=>1));
   $invalidKidEleAr = array('a'=>1, 'address'=>1, 'article'=>1, 'aside'=>1, 'audio'=>1, 'button'=>1, 'details'=>1, 'dfn'=>1, 'embed'=>1, 'fieldset'=>1, 'footer'=>1, 'form'=>1, 'h1'=>1, 'h2'=>1, 'h3'=>1, 'h4'=>1, 'h5'=>1, 'h6'=>1, 'header'=>1, 'hgroup'=>1, 'iframe'=>1, 'keygen'=>1, 'label'=>1, 'main'=>1, 'meter'=>1, 'nav'=>1, 'progress'=>1, 'ruby'=>1, 'script'=>1, 'section'=>1, 'select'=>1, 'textarea'=>1, 'time'=>1, 'video'=>1); // $invalidMomKidAr values
   $invalidMomEleAr = array_keys($invalidMomKidAr);
-  $validMomKidAr = array('colgroup'=>array('col'=>1, 'template'=>1), 'datalist'=>array('option'=>1, 'script'=>1), 'details'=>array('summary'=>1), 'dir'=>array('li'=>1), 'dl'=>array('dd'=>1, 'div'=>1, 'dt'=>1), 'hgroup'=>array('h1'=>1, 'h2'=>1, 'h3'=>1, 'h4'=>1, 'h5'=>1, 'h6'=>1), 'menu'=>array('li'=>1, 'script'=>1, 'template'=>1), 'ol'=>array('li'=>1, 'script'=>1, 'template'=>1), 'optgroup'=>array('option'=>1, 'script'=>1, 'template'=>1), 'option'=>array('#pcdata'=>1), 'picture'=>array('img'=>1, 'script'=>1, 'source'=>1, 'template'=>1), 'rbc'=>array('rb'=>1), 'rp'=>array('#pcdata'=>1), 'rtc'=>array('rp'=>1, 'rt'=>1), 'ruby'=>array('rb'=>1, 'rbc'=>1, 'rp'=>1, 'rt'=>1, 'rtc'=>1, '#pcdata'=>1), 'select'=>array('optgroup'=>1, 'option'=>1), 'script'=>array('#pcdata'=>1), 'table'=>array('caption'=>1, 'col'=>1, 'colgroup'=>1, 'script'=>1, 'tbody'=>1, 'tfoot'=>1, 'thead'=>1, 'tr'=>1, 'template'=>1), 'tbody'=>array('script'=>1, 'template'=>1, 'tr'=>1), 'tfoot'=>array('tr'=>1), 'textarea'=>array('#pcdata'=>1), 'thead'=>array('script'=>1, 'template'=>1, 'tr'=>1), 'tr'=>array('script'=>1, 'td'=>1, 'template'=>1, 'th'=>1), 'ul'=>array('li'=>1, 'script'=>1, 'template'=>1)); // Immediate parent-child relation
+  $validMomKidAr = array('colgroup'=>array('col'=>1, 'template'=>1), 'datalist'=>array('option'=>1, 'script'=>1), 'dir'=>array('li'=>1), 'dl'=>array('dd'=>1, 'div'=>1, 'dt'=>1), 'hgroup'=>array('h1'=>1, 'h2'=>1, 'h3'=>1, 'h4'=>1, 'h5'=>1, 'h6'=>1), 'menu'=>array('li'=>1, 'script'=>1, 'template'=>1), 'ol'=>array('li'=>1, 'script'=>1, 'template'=>1), 'optgroup'=>array('option'=>1, 'script'=>1, 'template'=>1), 'option'=>array('#pcdata'=>1), 'picture'=>array('img'=>1, 'script'=>1, 'source'=>1, 'template'=>1), 'rbc'=>array('rb'=>1), 'rp'=>array('#pcdata'=>1), 'rtc'=>array('rp'=>1, 'rt'=>1), 'ruby'=>array('rb'=>1, 'rbc'=>1, 'rp'=>1, 'rt'=>1, 'rtc'=>1, '#pcdata'=>1), 'select'=>array('optgroup'=>1, 'option'=>1), 'script'=>array('#pcdata'=>1), 'table'=>array('caption'=>1, 'col'=>1, 'colgroup'=>1, 'script'=>1, 'tbody'=>1, 'tfoot'=>1, 'thead'=>1, 'tr'=>1, 'template'=>1), 'tbody'=>array('script'=>1, 'template'=>1, 'tr'=>1), 'tfoot'=>array('tr'=>1), 'textarea'=>array('#pcdata'=>1), 'thead'=>array('script'=>1, 'template'=>1, 'tr'=>1), 'tr'=>array('script'=>1, 'td'=>1, 'template'=>1, 'th'=>1), 'ul'=>array('li'=>1, 'script'=>1, 'template'=>1)); // Immediate parent-child relation
   if ($GLOBALS['C']['direct_list_nest']) {
     $validMomKidAr['ol'] = $validMomKidAr['ul'] = $validMomKidAr['menu'] += array('menu'=>1, 'ol'=>1, 'ul'=>1);
   }
diff --git a/tests/HTMLawedTest.php b/tests/HTMLawedTest.php
index ca37393..540ed35 100644
--- a/tests/HTMLawedTest.php
+++ b/tests/HTMLawedTest.php
@@ -43,6 +43,14 @@ public function testPictureBlocks()
         $this->assertSame($input, $output);
     }
 
+    public function testDetailsAllowsFlowContentAfterSummary()
+    {
+        $input = '<details><summary>short description</summary><p>Hidden long text</p></details>';
+
+        $output = htmLawed($input);
+        $this->assertSame($input, $output);
+    }
+
     public function dataForSelfClosingTags()
     {
         return [