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Testing of w3c style sheet and screens-compatibility
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![Standard CSS - W3C validation [#3053751] | Drupal.org](https://www.drupal.org/files/issues/2019-05-09/screenshot.png "Standard CSS - W3C validation [#3053751] | Drupal.org")
Standard CSS - W3C validation [#3053751] | Drupal.org
Testing of w3c style sheet and screens-compatibility
