https://api.drupal.org/api/drupal/core%21modules%21rest%21tests%21src%21Functional%21Rest%21RestResourceConfigJsonCookieTest.php/property/RestResourceConfigJsonCookieTest%3A%3AdefaultTheme/10
RestResourceConfigJsonCookieTest::$defaultTheme | Drupal API
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https://api.drupal.org/api/drupal/core%21modules%21rest%21tests%21src%21Functional%21Rest%21RestResourceConfigJsonCookieTest.php/property/RestResourceConfigJsonCookieTest%3A%3AdefaultTheme/11.x
RestResourceConfigJsonCookieTest::$defaultTheme | Drupal API
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