symfony/html-sanitizer stripping <head> element despite being a safe element by default #58426
Description
Symfony version(s) affected
7.1 (symfony/html-sanitizer)
Description
By default, allowSafeElements() treats <head> as a safe element (see line 139 of vendor/symfony/html-sanitizer/HtmlSanitizerConfig.php and line 47 of vendor/symfony/html-sanitizer/Reference/W3CReference.php).
When using allowSafeElements(), the <head> element is still being stripped from the sanitized HTML. It's also stripped if that method is used in conjunction with allowElement('head').
How to reproduce
use Symfony\Component\HtmlSanitizer\HtmlSanitizer;
use Symfony\Component\HtmlSanitizer\HtmlSanitizerConfig;
$config = (new HtmlSanitizerConfig)->allowSafeElements();
$html = '<!DOCTYPE html><html><head><title>Example</title></head><body><p>Example</p></body></html>';
echo (new HtmlSanitizer($config))->sanitize($html)Expected output:
<html><head><title>Example</title><body><p>Example</p></body></html>Actual output:
<html><body><p>Example</p></body></html>Possible Solution
No response
Additional Context
No response