title: <!DOCTYPE html> is not showing in the browser and it is preventing TinyMCE to work. is there something that can prevent doctype to work?
body: <p>Here is the file where is present the doctype:</p>
  
  <pre><code>&lt;!DOCTYPE html&gt;
  &lt;html lang="fr"&gt;
  
  &lt;head&gt;
     &lt;meta charset="utf-8"&gt;
     &lt;meta name="viewport" content="width=device-width, initial-scale=1.0"&gt;
     &lt;base href="/p5/taekwondo/"&gt; 
     &lt;title&gt;Taekwendo&lt;/title&gt;
     &lt;link rel="stylesheet" type="text/css" href="public/css/style.css"&gt;
     &lt;!--Bootsrap--&gt;
     &lt;link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/css/bootstrap.min.css" integrity="sha384-Gn5384xqQ1aoWXA+058RXPxPg6fy4IWvTNh0E263XmFcJlSAwiGgFAW/dAiS6JXm" crossorigin="anonymous"&gt;
     &lt;script src="https://cdn.tiny.cloud/1/dn4trgysuntk7bas8bgdxa3q66so7v8wygzx78ylg1fpc5iu/tinymce/5/tinymce.min.js" referrerpolicy="origin"&gt;&lt;/script&gt;
      &lt;script&gt;
      tinymce.init({
      selector: '#article_content'
    });
    &lt;/script&gt;
  &lt;/head&gt;
  &lt;body&gt;
  
      &lt;nav class="navbar navbar-expand-lg navbar-dark bg-dark fixed-top" id="mainNav"&gt;
  
          &lt;div class="container"&gt;
              &lt;a class="navbar-brand" href="index.php"&gt;Menu&lt;/a&gt;
              &lt;button class="navbar-toggler navbar-toggler-right" type="button" data-toggle="collapse" data-target="#navbarSupportedContent" aria-controls="navbarSupportedContent" aria-expanded="false" aria-label="Toggle navigation"&gt;
                  &lt;span class="navbar-toggler-icon"&gt;&lt;/span&gt;
              &lt;/button&gt;
  
              &lt;div class="collapse navbar-collapse" id="navbarSupportedContent"&gt;
                  &lt;ul class="navbar-nav ml-auto"&gt;
                  &lt;li class="nav-item active"&gt;
                      &lt;a class="nav-link" href="index.php"&gt;Accueil&lt;/a&gt;
                  &lt;/li&gt;
                  &lt;?php
                  if(!empty($_SESSION)): ?&gt;
                  &lt;li class="nav-item"&gt;
                  &lt;a class="nav-link" href="admin"&gt;Accueil Admin&lt;/a&gt;
                  &lt;/li&gt;
                  &lt;li class="nav-item"&gt;
                  &lt;a class="nav-link" href="unlog"&gt;Se déconnecter&lt;/a&gt;
                  &lt;/li&gt;
                  &lt;?php endif;
                  ?&gt;
                  &lt;li class="nav-item"&gt;
                      &lt;a class="nav-link" href="events"&gt;Evènements&lt;/a&gt;
                  &lt;/li&gt;
                  &lt;li class="nav-item"&gt;
                      &lt;a class="nav-link" href="#"&gt;Histoire&lt;/a&gt;
                  &lt;/li&gt;
                  &lt;li class="nav-item"&gt;
                      &lt;a class="nav-link" href="informations"&gt;Informations&lt;/a&gt;
                  &lt;/li&gt;
                  &lt;/ul&gt;
              &lt;/div&gt;
          &lt;/div&gt;
      &lt;/nav&gt;
  
  &lt;?= $content ?&gt;
      &lt;!-- Optional JavaScript --&gt;
      &lt;!-- Popper.js, then Bootstrap JS --&gt;
      &lt;script src="https://ajax.googleapis.com/ajax/libs/jquery/3.4.1/jquery.min.js"&gt;&lt;/script&gt;
      &lt;script src="https://stackpath.bootstrapcdn.com/bootstrap/4.3.1/js/bootstrap.min.js" integrity="sha384-JjSmVgyd0p3pXB1rRibZUAYoIIy6OrQ6VrjIEaFf/nJGzIxFDsf4x0xIM+B07jRM" crossorigin="anonymous"&gt;&lt;/script&gt;
      &lt;script src="public/js/city.js"&gt;&lt;/script&gt;
  &lt;/body&gt;
  &lt;/html&gt; 
  </code></pre>
  
  <p>I tried to make work tinyMCE on my website and I got in the console the message "Failed to initialize the editor as the document is not in standards mode. TinyMCE requires standards mode."
  So I looked in the browser indeed Doctype is not present but it present in my code so I do understand why it is not showing up.</p>