Change record status: 
Project: 
Introduced in branch: 
main
Introduced in version: 
12.x
Description: 

The template at core/modules/media/templates/media-oembed-iframe.html.twig has been updated from

Before

{#
/**
 * @file
 * Default theme implementation to display an oEmbed resource in an iframe.
 *
 * @ingroup themeable
 */
#}
<!DOCTYPE html>
<html>
  <head>
    <css-placeholder token="{{ placeholder_token }}">
  </head>
  <body style="margin: 0">
    {{ media|raw }}
  </body>
</html>

To

After

{#
/**
 * @file
 * Default theme implementation to display an oEmbed resource in an iframe.
 *
 * Available variables:
 * - resource: The oEmbed Resource object.
 * - media: Markup with the resource HTML (e.g. an <iframe> from the provider).
 * - placeholder_token: A token for the CSS placeholder.
 * - langcode: The language code of the current content language (e.g. "fr").
 *
 * @ingroup themeable
 */
#}
<!DOCTYPE html>
<html lang="{{ langcode }}">
  <head>
    <css-placeholder token="{{ placeholder_token }}">
  </head>
  <body style="margin: 0">
    {{ media|raw }}
  </body>
</html>
Impacts: 
Themers