Hi i noticed when i ran the w3c validation that the {style} was not assigned a "type=" in side of  ow_system_plugins/base/views/controllers/user_standard_sign_in.html

i found that in ow_core/html_document.php you have this function

 public function addStyleDeclaration( $style, $media = 'all', $priority = null )
    {
        $media = trim(mb_strtolower($media));

        $styleHash = crc32($style);

        if ( in_array($styleHash, $this->styleDeclarations['hash']) )
        {
            return $this;
        }

        $priority = ($priority === null) ? 1000 : (int) $priority;

        $this->styleDeclarations['hash'][] = $styleHash;

        $this->styleDeclarations['items'][$priority][$media][] = $style;

        return $this;
    }

should we not be using or adding type="text/css"  as well in the array to build $style ?