ensure singleton tags work in formatter

Author: sinnbeck

src/Support/HtmlFormatter.php

@@ -50,7 +50,7 @@ protected function formatHtml(bool|string $html): string|array|null
     private function closeElementWithoutClosingElement($html)
     {
         return preg_replace(
-            '~></(?:area|base(?:font)?|br|col|command|embed|frame|hr|img|input|keygen|link|meta|param|source|track|wbr)>~',
+            '~></(?:area|base|br|col|command|embed|hr|img|input|keygen|link|meta|param|source|track|wbr)>~',
             ' />',
             $html
         );

tests/fixtures/advanced-expected.html

@@ -16,5 +16,6 @@
                 <input type="checkbox" value="2" />
             </li>
         </ul>
+        <span>foo<br /></span>
     </div>
 </div>

tests/fixtures/advanced.html

@@ -11,5 +11,6 @@
 <ul><li x-data="foobar"><input type="checkbox" value="1"></li>
 <li x-data="foobar"><input type="checkbox" value="2"></li>
 </ul>
+    <span>foo<br></span>
 </div>
 </div>