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How to change html ‘lang’ when node is created with a different language from the site’s default

I would like to change a node’s html ‘lang’ from site’s default to the selected language when creating a node.

For example, if I create a node and while creating I select French as the language, I would like the page’s html ‘lang’ to "fr"

So far I have this:

/** @var DrupalCoreTemplateAttribute $html_attribute */   $html_attribute = $variables['html_attributes'];   $node->get('langcode')->value;   if ($html_attribute->hasAttribute("lang")) {     $html_attribute->removeAttribute('lang');     $html_attribute->setAttribute('lang', 'langcode');   }
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How to change html ‘lang’ when node is created with a different language from the site’s default

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