merged branch spil-giacomo/patch-1 (PR #7963)

This PR was merged into the master branch.

Discussion
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Update Crawler.php

If HTML is not well-formed XML parsing goes wrong.
Could be useful create another method returning XML and XHTML in a `well-formed` standard?

Commits
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0a26641 Update Crawler.php

src/Symfony/Component/DomCrawler/Crawler.php

@@ -499,7 +499,7 @@ class Crawler extends \SplObjectStorage
 
         $html = '';
         foreach ($this->getNode(0)->childNodes as $child) {
-            $html .= $child->ownerDocument->saveXML($child);
+            $html .= $child->ownerDocument->saveHTML($child);
         }
 
         return $html;