$filter_warning='CKEditor 5 only works with HTML-based text formats. The "A TYPE_MARKUP_LANGUAGE filter incompatible with CKEditor 5" (filter_incompatible) filter implies this text format is not HTML anymore.';
$this->assertSession()->pageTextContains('The following attribute(s) are already supported by enabled plugins and should not be added to the Source Editing "Manually editable HTML tags" field: Image (<img src alt data-entity-uuid data-entity-type>)');
$assert_session->assertWaitOnAjaxRequest();
$assert_session->waitForText('Manually editable HTML tags');
$basic_html_format_with_media_embed_view_mode_enabled_two_view_modes_configured['name']=' (with Media Embed support, view mode enabled and two view modes configured )';