What could be causing the <form> tag to be removed when including a form in PHP?

The issue of the <form> tag being removed when including a form in PHP could be due to the PHP code being processed before the HTML is rendered. To solve this issue, you can simply move the <form> tag outside of the PHP code block so that it is not affected by PHP processing. 

&lt;!-- HTML form with &lt;form&gt; tag outside of PHP code block --&gt;
&lt;form action=&quot;submit.php&quot; method=&quot;post&quot;&gt;
    &lt;?php
    // PHP code block for including form elements
    echo &quot;&lt;input type=&#039;text&#039; name=&#039;username&#039;&gt;&quot;;
    echo &quot;&lt;input type=&#039;password&#039; name=&#039;password&#039;&gt;&quot;;
    ?&gt;
    &lt;button type=&quot;submit&quot;&gt;Submit&lt;/button&gt;
&lt;/form&gt;

Keywords

PHP form tag HTML htmlspecialchars encoding

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