From b09b3ad2f17be63b0e1f842d1cec5a9ab86ed636 Mon Sep 17 00:00:00 2001
From: Anders Pedersen <hot415@hotmail.com>
Date: Mon, 13 Sep 2021 22:32:21 +0200
Subject: [PATCH] Fixed issue #1

---
 src/Dom/Parser.php | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/Dom/Parser.php b/src/Dom/Parser.php
index 7915688..94232af 100644
--- a/src/Dom/Parser.php
+++ b/src/Dom/Parser.php
@@ -140,6 +140,10 @@ private function parseTag(Options $options, Content $content, int $size): TagDTO
             if (\trim($tag) == '') {
                 // no tag found, invalid < found
                 return TagDTO::makeFromPrimitives();
+            } elseif ($tag === '!doctype') {
+                $tag = (new Tag($rawTag))
+                    ->noTrailingSlash()
+                    ->selfClosing();
             }
         }
         $node = new HtmlNode($tag, $rawTag);