diff --git a/core/modules/system/css/components/admin-panel.css b/core/modules/system/css/components/admin-panel.css
index c9d38e8b..cdadc58 100644
--- a/core/modules/system/css/components/admin-panel.css
+++ b/core/modules/system/css/components/admin-panel.css
@@ -10,4 +10,4 @@
 .admin-panel .description {
   margin: 0 0 3px;
   padding: 2px 0 3px 0;
-}
\ No newline at end of file
+}
diff --git a/core/modules/system/src/Tests/Theme/ThemeInfoTest.php b/core/modules/system/src/Tests/Theme/ThemeInfoTest.php
index aeb8846..80633ee 100644
--- a/core/modules/system/src/Tests/Theme/ThemeInfoTest.php
+++ b/core/modules/system/src/Tests/Theme/ThemeInfoTest.php
@@ -73,19 +73,19 @@ function testStylesheets() {
 
     $this->drupalGet('theme-test/info/stylesheets');
 
-    $this->assertIdentical(1, count($this->xpath("//link[contains(@href, '$base/base-add.css')]")), "$base/base-add.css found");
-    $this->assertIdentical(1, count($this->xpath("//link[contains(@href, '$base/base-override.css')]")), "$base/base-override.css found");
-    $this->assertIdentical(0, count($this->xpath("//link[contains(@href, 'base-remove.css')]")), "base-remove.css not found");
+    $this->assertIdentical(1, count($this->xpath('//style[contains(text(), :text)]', array(':text' => "$base/base-add.css"))), "$base/base-add.css found");
+    $this->assertIdentical(1, count($this->xpath('//style[contains(text(), :text)]', array(':text' => "$base/base-override.css"))), "$base/base-override.css found");
+    $this->assertIdentical(0, count($this->xpath('//style[contains(text(), :text)]', array(':text' => 'base-remove.css'))), 'base-remove.css not found');
 
-    $this->assertIdentical(1, count($this->xpath("//link[contains(@href, '$sub/sub-add.css')]")), "$sub/sub-add.css found");
+    $this->assertIdentical(1, count($this->xpath('//style[contains(text(), :text)]', array(':text' => "$sub/sub-add.css"))), "$sub/sub-add.css");
 
-    $this->assertIdentical(1, count($this->xpath("//link[contains(@href, '$sub/sub-override.css')]")), "$sub/sub-override.css found");
-    $this->assertIdentical(1, count($this->xpath("//link[contains(@href, '$sub/base-add.sub-override.css')]")), "$sub/base-add.sub-override.css found");
-    $this->assertIdentical(1, count($this->xpath("//link[contains(@href, '$sub/base-remove.sub-override.css')]")), "$sub/base-remove.sub-override.css found");
+    $this->assertIdentical(1, count($this->xpath('//style[contains(text(), :text)]', array(':text' => "$sub/sub-override.css"))), "$sub/sub-override.css");
+    $this->assertIdentical(1, count($this->xpath('//style[contains(text(), :text)]', array(':text' => "$sub/base-add.sub-override.css"))), "$sub/base-add.sub-override.css");
+    $this->assertIdentical(1, count($this->xpath('//style[contains(text(), :text)]', array(':text' => "$sub/base-remove.sub-override.css"))), "$sub/base-remove.sub-override.css");
 
-    $this->assertIdentical(0, count($this->xpath("//link[contains(@href, 'sub-remove.css')]")), "sub-remove.css not found");
-    $this->assertIdentical(0, count($this->xpath("//link[contains(@href, 'base-add.sub-remove.css')]")), "base-add.sub-remove.css not found");
-    $this->assertIdentical(0, count($this->xpath("//link[contains(@href, 'base-override.sub-remove.css')]")), "base-override.sub-remove.css not found");
+    $this->assertIdentical(0, count($this->xpath('//style[contains(text(), :text)]', array(':text' => 'sub-remove.css'))), 'sub-remove.css not found');
+    $this->assertIdentical(0, count($this->xpath('//style[contains(text(), :text)]', array(':text' => 'base-add.sub-remove.css'))), 'base-add.sub-remove.css not found');
+    $this->assertIdentical(0, count($this->xpath('//style[contains(text(), :text)]', array(':text' => 'base-override.sub-remove.css'))), 'base-override.sub-remove.css not found');
   }
 
   /**