diff --git a/core/modules/rdf/src/Tests/Field/FieldRdfaTestBase.php b/core/modules/rdf/src/Tests/Field/FieldRdfaTestBase.php
index 8e4b50e..c0bd8b9 100644
--- a/core/modules/rdf/src/Tests/Field/FieldRdfaTestBase.php
+++ b/core/modules/rdf/src/Tests/Field/FieldRdfaTestBase.php
@@ -91,6 +91,7 @@ protected function assertFormatterRdfa($formatter, $property, $expected_rdf_valu
     $build = entity_view($this->entity, 'default');
     $output = drupal_render($build);
     $graph = new \EasyRdf_Graph($this->uri, $output, 'rdfa');
+    $this->setRawContent($output);
 
     // If verbose debugging is turned on, display the HTML and parsed RDF
     // in the results.
@@ -132,4 +133,52 @@ protected function getAbsoluteUri($entity) {
     return $entity->url('canonical', array('absolute' => TRUE));
   }
 
+  /**
+   * Parse a content and return the html element.
+   *
+   * @param string $content
+   *   The html to parse.
+   *
+   * @return array
+   *   An array containing simplexml objects.
+   */
+  protected function parseContent($content) {
+    $htmlDom = new \DOMDocument();
+    @$htmlDom->loadHTML('<?xml encoding="UTF-8">' . $content);
+    $elements = simplexml_import_dom($htmlDom);
+
+    return $elements;
+  }
+
+  /**
+   * Performs an xpath search on a certain content.
+   *
+   * The search is relative to the root element of the $content variable.
+   *
+   * @param string $content
+   *   The html to parse.
+   * @param string $xpath
+   *   The xpath string to use in the search.
+   * @param array $arguments
+   *   Some arguments for the xpath.
+   *
+   * @return array|FALSE
+   *   The return value of the xpath search. For details on the xpath string
+   *   format and return values see the SimpleXML documentation,
+   *   http://php.net/manual/function.simplexml-element-xpath.php.
+   */
+  protected function xpathContent($content, $xpath, array $arguments = array()) {
+    if ($elements = $this->parseContent($content)) {
+      $xpath = $this->buildXPathQuery($xpath, $arguments);
+      $result = $elements->xpath($xpath);
+      // Some combinations of PHP / libxml versions return an empty array
+      // instead of the documented FALSE. Forcefully convert any falsish values
+      // to an empty array to allow foreach(...) constructions.
+      return $result ? $result : array();
+    }
+    else {
+      return FALSE;
+    }
+  }
+
 }
diff --git a/core/modules/rdf/src/Tests/Field/NumberFieldRdfaTest.php b/core/modules/rdf/src/Tests/Field/NumberFieldRdfaTest.php
index c9246d0..dbfcfaa 100644
--- a/core/modules/rdf/src/Tests/Field/NumberFieldRdfaTest.php
+++ b/core/modules/rdf/src/Tests/Field/NumberFieldRdfaTest.php
@@ -64,6 +64,12 @@ public function testFloatFormatter() {
     $this->createTestField();
     $this->createTestEntity();
     $this->assertFormatterRdfa(array('type' => $this->fieldType), 'http://schema.org/baseSalary', array('value' => $this->testValue));
+
+    // Test that the content attribute is not created.
+    $xpath = "/div[@class='field-name-field-test']/div[@class='field-item']"; // and @content
+    $args = array();
+    $result = $this->xpathContent($this->getRawContent(), $xpath, $args);
+    debug($result);
   }
 
   /**
@@ -141,7 +147,7 @@ public function testDecimalFormatterWithSettings() {
   }
 
   /**
-   * Create the RDF mapping for the field.
+   * Creates the RDF mapping for the field.
    */
   protected function createTestEntity() {
     // Add the mapping.