Allow <details> and <summary> elements through sanitizer

lib/sanitize.js

@@ -5,7 +5,7 @@ var sanitizer = module.exports = function (html) {
 
 sanitizer.config = {
   allowedTags: sanitizeHtml.defaults.allowedTags.concat([
-    'dd', 'del', 'div', 'dl', 'dt', 'h1', 'h2', 'iframe', 'img', 'input', 'ins', 'meta', 'path', 'pre', 's', 'span', 'sub', 'sup', 'svg'
+    'dd', 'del', 'details', 'div', 'dl', 'dt', 'h1', 'h2', 'iframe', 'img', 'input', 'ins', 'meta', 'path', 'pre', 's', 'span', 'sub', 'summary', 'sup', 'svg'
   ]),
   allowedClasses: {
     a: ['anchor'],

test/sanitize.js

@@ -182,4 +182,11 @@ describe('sanitize', function () {
     assert.equal($('img').attr('src'), 'http://example.com/an%20image.png')
     assert.equal($('a').attr('href'), 'http://example.com/link%20me.html')
   })
+
+  it('allows the <details>/<summary> elements', function () {
+    var src = '# Test\n\n<details><summary>Summary here</summary>\nLong long information, War & Peace, etc...</details>\n'
+    var $ = cheerio.load(marky(src))
+    assert.equal($('details').length, 1)
+    assert.equal($('summary').length, 1)
+  })
 })