Index: src/wp-includes/formatting.php
===================================================================
--- src/wp-includes/formatting.php	(revision 25706)
+++ src/wp-includes/formatting.php	(working copy)
@@ -3249,6 +3249,10 @@
 
 /**
  * Properly strip all HTML tags including script and style
+ * 
+ * This differs from strip_tags() because it removes the contents of 
+ * the <script> and <style> tags. E.g. strip_tags( '<script>something</script>' )
+ * will return 'something'. wp_strip_all_tags will return ''
  *
  * @since 2.9.0
  *
Index: tests/phpunit/tests/functions.php
===================================================================
--- tests/phpunit/tests/functions.php	(revision 25706)
+++ tests/phpunit/tests/functions.php	(working copy)
@@ -519,4 +519,31 @@
 		$this->assertCount( 7, $urls );
 		$this->assertEquals( array_slice( $original_urls, 0, 7 ), $urls );
 	}
+
+	/**
+	 * Test the wp_strip_all_tags function
+	 */
+	function test_wp_strip_all_tags() {
+
+		$text = 'lorem<br />ipsum';
+		$this->assertEquals( 'loremipsum', wp_strip_all_tags( $text ) );
+
+		$text = "lorem<br />\nipsum";
+		$this->assertEquals( "lorem\nipsum", wp_strip_all_tags( $text ) );
+
+		// test removing breaks is working
+		$text = "lorem<br />ipsum";
+		$this->assertEquals( "loremipsum", wp_strip_all_tags( $text, true ) );
+
+		// test script / style tag's contents is removed
+		$text = "lorem<script>alert(document.cookie)</script>ipsum";
+		$this->assertEquals( "loremipsum", wp_strip_all_tags( $text ) );
+
+		$text = "lorem<style>* { display: 'none' }</style>ipsum";
+		$this->assertEquals( "loremipsum", wp_strip_all_tags( $text ) );
+
+		// test "marlformed" markup of contents
+		$text = "lorem<style>* { display: 'none' }<script>alert( document.cookie )</script></style>ipsum";
+		$this->assertEquals( "loremipsum", wp_strip_all_tags( $text ) );
+	}
 }