DOMTokenList: Update serialization algorithm on add()/remove()

third_party/WebKit/LayoutTests/external/wpt/dom/nodes/Element-classlist-expected.txt

Index: third_party/WebKit/LayoutTests/external/wpt/dom/nodes/Element-classlist-expected.txt
diff --git a/third_party/WebKit/LayoutTests/external/wpt/dom/nodes/Element-classlist-expected.txt b/third_party/WebKit/LayoutTests/external/wpt/dom/nodes/Element-classlist-expected.txt
index 9c987bffb54b238084d8069f71d2b1e6bfb14b2a..be8e872a2addf9eff46ee8aa865307a049b9141d 100644
--- a/third_party/WebKit/LayoutTests/external/wpt/dom/nodes/Element-classlist-expected.txt
+++ b/third_party/WebKit/LayoutTests/external/wpt/dom/nodes/Element-classlist-expected.txt
@@ -1,5 +1,5 @@
 This is a testharness.js-based test.
-Found 1135 tests; 685 PASS, 450 FAIL, 0 TIMEOUT, 0 NOTRUN.
+Found 1135 tests; 745 PASS, 390 FAIL, 0 TIMEOUT, 0 NOTRUN.
 PASS Assigning to classList (HTML node) 
 PASS .supports() must throw TypeError (HTML node) 
 PASS classList.length when removed (HTML node) 
@@ -83,21 +83,21 @@ PASS classList.add("a", "aa ") with attribute value null (HTML node)
 PASS classList.add("a") with attribute value "a" (HTML node) 
 PASS classList.add("AA") with attribute value "aa" (HTML node) 
 PASS classList.add("a") with attribute value "a b c" (HTML node) 
-FAIL classList.add("a") with attribute value "a a a  b" (HTML node) assert_equals: wrong class after modification expected "a b" but got "a a a  b"
+FAIL classList.add("a") with attribute value "a a a  b" (HTML node) assert_equals: wrong class after modification expected "a b" but got "a a a b"
 PASS classList.add("a") with attribute value null (HTML node) 
 PASS classList.add("a") with attribute value "" (HTML node) 
-FAIL classList.add("a") with attribute value " " (HTML node) assert_equals: wrong class after modification expected "a" but got " a"
-FAIL classList.add("a") with attribute value "   \f" (HTML node) assert_equals: wrong class after modification expected "a" but got "   \fa"
+PASS classList.add("a") with attribute value " " (HTML node) 
+PASS classList.add("a") with attribute value "   \f" (HTML node) 
 PASS classList.add("b") with attribute value "a" (HTML node) 
 PASS classList.add("d") with attribute value "a b c" (HTML node) 
 PASS classList.add("d") with attribute value "a b c " (HTML node) 
-FAIL classList.add("c") with attribute value "   a  a b" (HTML node) assert_equals: wrong class after modification expected "a b c" but got "   a  a b c"
-FAIL classList.add("a") with attribute value "   a  a b" (HTML node) assert_equals: wrong class after modification expected "a b" but got "   a  a b"
-FAIL classList.add("c") with attribute value "\t\n\f\r a\t\n\f\r b\t\n\f\r " (HTML node) assert_equals: wrong class after modification expected "a b c" but got "\t\n\f\r a\t\n\f\r b\t\n\f\r c"
+FAIL classList.add("c") with attribute value "   a  a b" (HTML node) assert_equals: wrong class after modification expected "a b c" but got "a a b c"
+FAIL classList.add("a") with attribute value "   a  a b" (HTML node) assert_equals: wrong class after modification expected "a b" but got "a a b"
+PASS classList.add("c") with attribute value "\t\n\f\r a\t\n\f\r b\t\n\f\r " (HTML node) 
 PASS classList.add("d", "e") with attribute value "a b c " (HTML node) 
-FAIL classList.add("a", "a") with attribute value "a b c " (HTML node) assert_equals: wrong class after modification expected "a b c" but got "a b c "
+PASS classList.add("a", "a") with attribute value "a b c " (HTML node) 
 PASS classList.add("d", "d") with attribute value "a b c " (HTML node) 
-FAIL classList.add() with attribute value "a b c a " (HTML node) assert_equals: wrong class after modification expected "a b c" but got "a b c a "
+FAIL classList.add() with attribute value "a b c a " (HTML node) assert_equals: wrong class after modification expected "a b c" but got "a b c a"
 PASS classList.add("a", "b") with attribute value null (HTML node) 
 PASS classList.add("a", "b") with attribute value "" (HTML node) 
 PASS classList.add(null) with attribute value null (HTML node) 
@@ -117,8 +117,8 @@ PASS classList.remove("a ") with attribute value "a " (HTML node)
 PASS classList.remove("aa ") with attribute value "aa " (HTML node) 
 PASS classList.remove("a") with attribute value null (HTML node) 
 PASS classList.remove("a") with attribute value "" (HTML node) 
-FAIL classList.remove("d") with attribute value "a b  c" (HTML node) assert_equals: wrong class after modification expected "a b c" but got "a b  c"
-FAIL classList.remove("A") with attribute value "a b  c" (HTML node) assert_equals: wrong class after modification expected "a b c" but got "a b  c"
+PASS classList.remove("d") with attribute value "a b  c" (HTML node) 
+PASS classList.remove("A") with attribute value "a b  c" (HTML node) 
 PASS classList.remove("a") with attribute value " a a a " (HTML node) 
 PASS classList.remove("a") with attribute value "a  b" (HTML node) 
 PASS classList.remove("a") with attribute value "a  b  " (HTML node) 
@@ -136,12 +136,12 @@ PASS classList.remove("a") with attribute value "a b a c a d a" (HTML node)
 FAIL classList.remove("AA") with attribute value "AA BB aa CC AA dd aa" (HTML node) assert_equals: wrong class after modification expected "BB aa CC dd" but got "BB aa CC dd aa"
 PASS classList.remove("a") with attribute value "\ra\na\ta\f" (HTML node) 
 PASS classList.remove("a") with attribute value "\t\n\f\r a\t\n\f\r b\t\n\f\r " (HTML node) 
-FAIL classList.remove("d", "e") with attribute value "a b c " (HTML node) assert_equals: wrong class after modification expected "a b c" but got "a b c "
+PASS classList.remove("d", "e") with attribute value "a b c " (HTML node) 
 PASS classList.remove("a", "b") with attribute value "a b c " (HTML node) 
 PASS classList.remove("a", "c") with attribute value "a b c " (HTML node) 
 PASS classList.remove("a", "a") with attribute value "a b c " (HTML node) 
-FAIL classList.remove("d", "d") with attribute value "a b c " (HTML node) assert_equals: wrong class after modification expected "a b c" but got "a b c "
-FAIL classList.remove() with attribute value "a b c " (HTML node) assert_equals: wrong class after modification expected "a b c" but got "a b c "
+PASS classList.remove("d", "d") with attribute value "a b c " (HTML node) 
+PASS classList.remove() with attribute value "a b c " (HTML node) 
 PASS classList.remove("a", "b") with attribute value null (HTML node) 
 PASS classList.remove("a", "b") with attribute value "" (HTML node) 
 FAIL classList.remove() with attribute value "a a" (HTML node) assert_equals: wrong class after modification expected "a" but got "a a"
@@ -151,22 +151,22 @@ PASS classList.toggle("") with attribute value null (HTML node)
 PASS classList.toggle("aa ") with attribute value null (HTML node) 
 PASS classList.toggle("a") with attribute value null (HTML node) 
 PASS classList.toggle("a") with attribute value "" (HTML node) 
-FAIL classList.toggle("a") with attribute value " " (HTML node) assert_equals: wrong class after modification expected "a" but got " a"
-FAIL classList.toggle("a") with attribute value "   \f" (HTML node) assert_equals: wrong class after modification expected "a" but got "   \fa"
+PASS classList.toggle("a") with attribute value " " (HTML node) 
+PASS classList.toggle("a") with attribute value "   \f" (HTML node) 
 PASS classList.toggle("b") with attribute value "a" (HTML node) 
 PASS classList.toggle("A") with attribute value "a" (HTML node) 
 PASS classList.toggle("d") with attribute value "a b c" (HTML node) 
-FAIL classList.toggle("d") with attribute value "   a  a b" (HTML node) assert_equals: wrong class after modification expected "a b d" but got "   a  a b d"
+FAIL classList.toggle("d") with attribute value "   a  a b" (HTML node) assert_equals: wrong class after modification expected "a b d" but got "a a b d"
 PASS classList.toggle("a") with attribute value "a" (HTML node) 
 PASS classList.toggle("a") with attribute value " a a a " (HTML node) 
-FAIL classList.toggle("a") with attribute value " A A A " (HTML node) assert_equals: wrong class after modification expected "A a" but got " A A A a"
+FAIL classList.toggle("a") with attribute value " A A A " (HTML node) assert_equals: wrong class after modification expected "A a" but got "A A A a"
 PASS classList.toggle("b") with attribute value " a b c " (HTML node) 
 PASS classList.toggle("b") with attribute value " a b c b b" (HTML node) 
 PASS classList.toggle("c") with attribute value " a b  c  " (HTML node) 
 PASS classList.toggle("a") with attribute value " a b c " (HTML node) 
 FAIL classList.toggle("b") with attribute value "   a  a b" (HTML node) assert_equals: wrong class after modification expected "a" but got "a a"
 PASS classList.toggle("a") with attribute value "\t\n\f\r a\t\n\f\r b\t\n\f\r " (HTML node) 
-FAIL classList.toggle("c") with attribute value "\t\n\f\r a\t\n\f\r b\t\n\f\r " (HTML node) assert_equals: wrong class after modification expected "a b c" but got "\t\n\f\r a\t\n\f\r b\t\n\f\r c"
+PASS classList.toggle("c") with attribute value "\t\n\f\r a\t\n\f\r b\t\n\f\r " (HTML node) 
 PASS classList.toggle(null) with attribute value "null" (HTML node) 
 PASS classList.toggle(null) with attribute value "" (HTML node) 
 PASS classList.toggle(undefined) with attribute value "undefined" (HTML node) 
@@ -390,21 +390,21 @@ PASS classList.add("a", "aa ") with attribute value null (XHTML node)
 PASS classList.add("a") with attribute value "a" (XHTML node) 
 PASS classList.add("AA") with attribute value "aa" (XHTML node) 
 PASS classList.add("a") with attribute value "a b c" (XHTML node) 
-FAIL classList.add("a") with attribute value "a a a  b" (XHTML node) assert_equals: wrong class after modification expected "a b" but got "a a a  b"
+FAIL classList.add("a") with attribute value "a a a  b" (XHTML node) assert_equals: wrong class after modification expected "a b" but got "a a a b"
 PASS classList.add("a") with attribute value null (XHTML node) 
 PASS classList.add("a") with attribute value "" (XHTML node) 
-FAIL classList.add("a") with attribute value " " (XHTML node) assert_equals: wrong class after modification expected "a" but got " a"
-FAIL classList.add("a") with attribute value "   \f" (XHTML node) assert_equals: wrong class after modification expected "a" but got "   \fa"
+PASS classList.add("a") with attribute value " " (XHTML node) 
+PASS classList.add("a") with attribute value "   \f" (XHTML node) 
 PASS classList.add("b") with attribute value "a" (XHTML node) 
 PASS classList.add("d") with attribute value "a b c" (XHTML node) 
 PASS classList.add("d") with attribute value "a b c " (XHTML node) 
-FAIL classList.add("c") with attribute value "   a  a b" (XHTML node) assert_equals: wrong class after modification expected "a b c" but got "   a  a b c"
-FAIL classList.add("a") with attribute value "   a  a b" (XHTML node) assert_equals: wrong class after modification expected "a b" but got "   a  a b"
-FAIL classList.add("c") with attribute value "\t\n\f\r a\t\n\f\r b\t\n\f\r " (XHTML node) assert_equals: wrong class after modification expected "a b c" but got "\t\n\f\r a\t\n\f\r b\t\n\f\r c"
+FAIL classList.add("c") with attribute value "   a  a b" (XHTML node) assert_equals: wrong class after modification expected "a b c" but got "a a b c"
+FAIL classList.add("a") with attribute value "   a  a b" (XHTML node) assert_equals: wrong class after modification expected "a b" but got "a a b"
+PASS classList.add("c") with attribute value "\t\n\f\r a\t\n\f\r b\t\n\f\r " (XHTML node) 
 PASS classList.add("d", "e") with attribute value "a b c " (XHTML node) 
-FAIL classList.add("a", "a") with attribute value "a b c " (XHTML node) assert_equals: wrong class after modification expected "a b c" but got "a b c "
+PASS classList.add("a", "a") with attribute value "a b c " (XHTML node) 
 PASS classList.add("d", "d") with attribute value "a b c " (XHTML node) 
-FAIL classList.add() with attribute value "a b c a " (XHTML node) assert_equals: wrong class after modification expected "a b c" but got "a b c a "
+FAIL classList.add() with attribute value "a b c a " (XHTML node) assert_equals: wrong class after modification expected "a b c" but got "a b c a"
 PASS classList.add("a", "b") with attribute value null (XHTML node) 
 PASS classList.add("a", "b") with attribute value "" (XHTML node) 
 PASS classList.add(null) with attribute value null (XHTML node) 
@@ -424,8 +424,8 @@ PASS classList.remove("a ") with attribute value "a " (XHTML node)
 PASS classList.remove("aa ") with attribute value "aa " (XHTML node) 
 PASS classList.remove("a") with attribute value null (XHTML node) 
 PASS classList.remove("a") with attribute value "" (XHTML node) 
-FAIL classList.remove("d") with attribute value "a b  c" (XHTML node) assert_equals: wrong class after modification expected "a b c" but got "a b  c"
-FAIL classList.remove("A") with attribute value "a b  c" (XHTML node) assert_equals: wrong class after modification expected "a b c" but got "a b  c"
+PASS classList.remove("d") with attribute value "a b  c" (XHTML node) 
+PASS classList.remove("A") with attribute value "a b  c" (XHTML node) 
 PASS classList.remove("a") with attribute value " a a a " (XHTML node) 
 PASS classList.remove("a") with attribute value "a  b" (XHTML node) 
 PASS classList.remove("a") with attribute value "a  b  " (XHTML node) 
@@ -443,12 +443,12 @@ PASS classList.remove("a") with attribute value "a b a c a d a" (XHTML node)
 FAIL classList.remove("AA") with attribute value "AA BB aa CC AA dd aa" (XHTML node) assert_equals: wrong class after modification expected "BB aa CC dd" but got "BB aa CC dd aa"
 PASS classList.remove("a") with attribute value "\ra\na\ta\f" (XHTML node) 
 PASS classList.remove("a") with attribute value "\t\n\f\r a\t\n\f\r b\t\n\f\r " (XHTML node) 
-FAIL classList.remove("d", "e") with attribute value "a b c " (XHTML node) assert_equals: wrong class after modification expected "a b c" but got "a b c "
+PASS classList.remove("d", "e") with attribute value "a b c " (XHTML node) 
 PASS classList.remove("a", "b") with attribute value "a b c " (XHTML node) 
 PASS classList.remove("a", "c") with attribute value "a b c " (XHTML node) 
 PASS classList.remove("a", "a") with attribute value "a b c " (XHTML node) 
-FAIL classList.remove("d", "d") with attribute value "a b c " (XHTML node) assert_equals: wrong class after modification expected "a b c" but got "a b c "
-FAIL classList.remove() with attribute value "a b c " (XHTML node) assert_equals: wrong class after modification expected "a b c" but got "a b c "
+PASS classList.remove("d", "d") with attribute value "a b c " (XHTML node) 
+PASS classList.remove() with attribute value "a b c " (XHTML node) 
 PASS classList.remove("a", "b") with attribute value null (XHTML node) 
 PASS classList.remove("a", "b") with attribute value "" (XHTML node) 
 FAIL classList.remove() with attribute value "a a" (XHTML node) assert_equals: wrong class after modification expected "a" but got "a a"
@@ -458,22 +458,22 @@ PASS classList.toggle("") with attribute value null (XHTML node)
 PASS classList.toggle("aa ") with attribute value null (XHTML node) 
 PASS classList.toggle("a") with attribute value null (XHTML node) 
 PASS classList.toggle("a") with attribute value "" (XHTML node) 
-FAIL classList.toggle("a") with attribute value " " (XHTML node) assert_equals: wrong class after modification expected "a" but got " a"
-FAIL classList.toggle("a") with attribute value "   \f" (XHTML node) assert_equals: wrong class after modification expected "a" but got "   \fa"
+PASS classList.toggle("a") with attribute value " " (XHTML node) 
+PASS classList.toggle("a") with attribute value "   \f" (XHTML node) 
 PASS classList.toggle("b") with attribute value "a" (XHTML node) 
 PASS classList.toggle("A") with attribute value "a" (XHTML node) 
 PASS classList.toggle("d") with attribute value "a b c" (XHTML node) 
-FAIL classList.toggle("d") with attribute value "   a  a b" (XHTML node) assert_equals: wrong class after modification expected "a b d" but got "   a  a b d"
+FAIL classList.toggle("d") with attribute value "   a  a b" (XHTML node) assert_equals: wrong class after modification expected "a b d" but got "a a b d"
 PASS classList.toggle("a") with attribute value "a" (XHTML node) 
 PASS classList.toggle("a") with attribute value " a a a " (XHTML node) 
-FAIL classList.toggle("a") with attribute value " A A A " (XHTML node) assert_equals: wrong class after modification expected "A a" but got " A A A a"
+FAIL classList.toggle("a") with attribute value " A A A " (XHTML node) assert_equals: wrong class after modification expected "A a" but got "A A A a"
 PASS classList.toggle("b") with attribute value " a b c " (XHTML node) 
 PASS classList.toggle("b") with attribute value " a b c b b" (XHTML node) 
 PASS classList.toggle("c") with attribute value " a b  c  " (XHTML node) 
 PASS classList.toggle("a") with attribute value " a b c " (XHTML node) 
 FAIL classList.toggle("b") with attribute value "   a  a b" (XHTML node) assert_equals: wrong class after modification expected "a" but got "a a"
 PASS classList.toggle("a") with attribute value "\t\n\f\r a\t\n\f\r b\t\n\f\r " (XHTML node) 
-FAIL classList.toggle("c") with attribute value "\t\n\f\r a\t\n\f\r b\t\n\f\r " (XHTML node) assert_equals: wrong class after modification expected "a b c" but got "\t\n\f\r a\t\n\f\r b\t\n\f\r c"
+PASS classList.toggle("c") with attribute value "\t\n\f\r a\t\n\f\r b\t\n\f\r " (XHTML node) 
 PASS classList.toggle(null) with attribute value "null" (XHTML node) 
 PASS classList.toggle(null) with attribute value "" (XHTML node) 
 PASS classList.toggle(undefined) with attribute value "undefined" (XHTML node) 
@@ -697,21 +697,21 @@ PASS classList.add("a", "aa ") with attribute value null (MathML node)
 PASS classList.add("a") with attribute value "a" (MathML node) 
 PASS classList.add("AA") with attribute value "aa" (MathML node) 
 PASS classList.add("a") with attribute value "a b c" (MathML node) 
-FAIL classList.add("a") with attribute value "a a a  b" (MathML node) assert_equals: wrong class after modification expected "a b" but got "a a a  b"
+FAIL classList.add("a") with attribute value "a a a  b" (MathML node) assert_equals: wrong class after modification expected "a b" but got "a a a b"
 PASS classList.add("a") with attribute value null (MathML node) 
 PASS classList.add("a") with attribute value "" (MathML node) 
-FAIL classList.add("a") with attribute value " " (MathML node) assert_equals: wrong class after modification expected "a" but got " a"
-FAIL classList.add("a") with attribute value "   \f" (MathML node) assert_equals: wrong class after modification expected "a" but got "   \fa"
+PASS classList.add("a") with attribute value " " (MathML node) 
+PASS classList.add("a") with attribute value "   \f" (MathML node) 
 PASS classList.add("b") with attribute value "a" (MathML node) 
 PASS classList.add("d") with attribute value "a b c" (MathML node) 
 PASS classList.add("d") with attribute value "a b c " (MathML node) 
-FAIL classList.add("c") with attribute value "   a  a b" (MathML node) assert_equals: wrong class after modification expected "a b c" but got "   a  a b c"
-FAIL classList.add("a") with attribute value "   a  a b" (MathML node) assert_equals: wrong class after modification expected "a b" but got "   a  a b"
-FAIL classList.add("c") with attribute value "\t\n\f\r a\t\n\f\r b\t\n\f\r " (MathML node) assert_equals: wrong class after modification expected "a b c" but got "\t\n\f\r a\t\n\f\r b\t\n\f\r c"
+FAIL classList.add("c") with attribute value "   a  a b" (MathML node) assert_equals: wrong class after modification expected "a b c" but got "a a b c"
+FAIL classList.add("a") with attribute value "   a  a b" (MathML node) assert_equals: wrong class after modification expected "a b" but got "a a b"
+PASS classList.add("c") with attribute value "\t\n\f\r a\t\n\f\r b\t\n\f\r " (MathML node) 
 PASS classList.add("d", "e") with attribute value "a b c " (MathML node) 
-FAIL classList.add("a", "a") with attribute value "a b c " (MathML node) assert_equals: wrong class after modification expected "a b c" but got "a b c "
+PASS classList.add("a", "a") with attribute value "a b c " (MathML node) 
 PASS classList.add("d", "d") with attribute value "a b c " (MathML node) 
-FAIL classList.add() with attribute value "a b c a " (MathML node) assert_equals: wrong class after modification expected "a b c" but got "a b c a "
+FAIL classList.add() with attribute value "a b c a " (MathML node) assert_equals: wrong class after modification expected "a b c" but got "a b c a"
 PASS classList.add("a", "b") with attribute value null (MathML node) 
 PASS classList.add("a", "b") with attribute value "" (MathML node) 
 PASS classList.add(null) with attribute value null (MathML node) 
@@ -731,8 +731,8 @@ PASS classList.remove("a ") with attribute value "a " (MathML node)
 PASS classList.remove("aa ") with attribute value "aa " (MathML node) 
 PASS classList.remove("a") with attribute value null (MathML node) 
 PASS classList.remove("a") with attribute value "" (MathML node) 
-FAIL classList.remove("d") with attribute value "a b  c" (MathML node) assert_equals: wrong class after modification expected "a b c" but got "a b  c"
-FAIL classList.remove("A") with attribute value "a b  c" (MathML node) assert_equals: wrong class after modification expected "a b c" but got "a b  c"
+PASS classList.remove("d") with attribute value "a b  c" (MathML node) 
+PASS classList.remove("A") with attribute value "a b  c" (MathML node) 
 PASS classList.remove("a") with attribute value " a a a " (MathML node) 
 PASS classList.remove("a") with attribute value "a  b" (MathML node) 
 PASS classList.remove("a") with attribute value "a  b  " (MathML node) 
@@ -750,12 +750,12 @@ PASS classList.remove("a") with attribute value "a b a c a d a" (MathML node)
 FAIL classList.remove("AA") with attribute value "AA BB aa CC AA dd aa" (MathML node) assert_equals: wrong class after modification expected "BB aa CC dd" but got "BB aa CC dd aa"
 PASS classList.remove("a") with attribute value "\ra\na\ta\f" (MathML node) 
 PASS classList.remove("a") with attribute value "\t\n\f\r a\t\n\f\r b\t\n\f\r " (MathML node) 
-FAIL classList.remove("d", "e") with attribute value "a b c " (MathML node) assert_equals: wrong class after modification expected "a b c" but got "a b c "
+PASS classList.remove("d", "e") with attribute value "a b c " (MathML node) 
 PASS classList.remove("a", "b") with attribute value "a b c " (MathML node) 
 PASS classList.remove("a", "c") with attribute value "a b c " (MathML node) 
 PASS classList.remove("a", "a") with attribute value "a b c " (MathML node) 
-FAIL classList.remove("d", "d") with attribute value "a b c " (MathML node) assert_equals: wrong class after modification expected "a b c" but got "a b c "
-FAIL classList.remove() with attribute value "a b c " (MathML node) assert_equals: wrong class after modification expected "a b c" but got "a b c "
+PASS classList.remove("d", "d") with attribute value "a b c " (MathML node) 
+PASS classList.remove() with attribute value "a b c " (MathML node) 
 PASS classList.remove("a", "b") with attribute value null (MathML node) 
 PASS classList.remove("a", "b") with attribute value "" (MathML node) 
 FAIL classList.remove() with attribute value "a a" (MathML node) assert_equals: wrong class after modification expected "a" but got "a a"
@@ -765,22 +765,22 @@ PASS classList.toggle("") with attribute value null (MathML node)
 PASS classList.toggle("aa ") with attribute value null (MathML node) 
 PASS classList.toggle("a") with attribute value null (MathML node) 
 PASS classList.toggle("a") with attribute value "" (MathML node) 
-FAIL classList.toggle("a") with attribute value " " (MathML node) assert_equals: wrong class after modification expected "a" but got " a"
-FAIL classList.toggle("a") with attribute value "   \f" (MathML node) assert_equals: wrong class after modification expected "a" but got "   \fa"
+PASS classList.toggle("a") with attribute value " " (MathML node) 
+PASS classList.toggle("a") with attribute value "   \f" (MathML node) 
 PASS classList.toggle("b") with attribute value "a" (MathML node) 
 PASS classList.toggle("A") with attribute value "a" (MathML node) 
 PASS classList.toggle("d") with attribute value "a b c" (MathML node) 
-FAIL classList.toggle("d") with attribute value "   a  a b" (MathML node) assert_equals: wrong class after modification expected "a b d" but got "   a  a b d"
+FAIL classList.toggle("d") with attribute value "   a  a b" (MathML node) assert_equals: wrong class after modification expected "a b d" but got "a a b d"
 PASS classList.toggle("a") with attribute value "a" (MathML node) 
 PASS classList.toggle("a") with attribute value " a a a " (MathML node) 
-FAIL classList.toggle("a") with attribute value " A A A " (MathML node) assert_equals: wrong class after modification expected "A a" but got " A A A a"
+FAIL classList.toggle("a") with attribute value " A A A " (MathML node) assert_equals: wrong class after modification expected "A a" but got "A A A a"
 PASS classList.toggle("b") with attribute value " a b c " (MathML node) 
 PASS classList.toggle("b") with attribute value " a b c b b" (MathML node) 
 PASS classList.toggle("c") with attribute value " a b  c  " (MathML node) 
 PASS classList.toggle("a") with attribute value " a b c " (MathML node) 
 FAIL classList.toggle("b") with attribute value "   a  a b" (MathML node) assert_equals: wrong class after modification expected "a" but got "a a"
 PASS classList.toggle("a") with attribute value "\t\n\f\r a\t\n\f\r b\t\n\f\r " (MathML node) 
-FAIL classList.toggle("c") with attribute value "\t\n\f\r a\t\n\f\r b\t\n\f\r " (MathML node) assert_equals: wrong class after modification expected "a b c" but got "\t\n\f\r a\t\n\f\r b\t\n\f\r c"
+PASS classList.toggle("c") with attribute value "\t\n\f\r a\t\n\f\r b\t\n\f\r " (MathML node) 
 PASS classList.toggle(null) with attribute value "null" (MathML node) 
 PASS classList.toggle(null) with attribute value "" (MathML node) 
 PASS classList.toggle(undefined) with attribute value "undefined" (MathML node) 
@@ -1004,21 +1004,21 @@ PASS classList.add("a", "aa ") with attribute value null (XML node with null nam
 PASS classList.add("a") with attribute value "a" (XML node with null namespace) 
 PASS classList.add("AA") with attribute value "aa" (XML node with null namespace) 
 PASS classList.add("a") with attribute value "a b c" (XML node with null namespace) 
-FAIL classList.add("a") with attribute value "a a a  b" (XML node with null namespace) assert_equals: wrong class after modification expected "a b" but got "a a a  b"
+FAIL classList.add("a") with attribute value "a a a  b" (XML node with null namespace) assert_equals: wrong class after modification expected "a b" but got "a a a b"
 PASS classList.add("a") with attribute value null (XML node with null namespace) 
 PASS classList.add("a") with attribute value "" (XML node with null namespace) 
-FAIL classList.add("a") with attribute value " " (XML node with null namespace) assert_equals: wrong class after modification expected "a" but got " a"
-FAIL classList.add("a") with attribute value "   \f" (XML node with null namespace) assert_equals: wrong class after modification expected "a" but got "   \fa"
+PASS classList.add("a") with attribute value " " (XML node with null namespace) 
+PASS classList.add("a") with attribute value "   \f" (XML node with null namespace) 
 PASS classList.add("b") with attribute value "a" (XML node with null namespace) 
 PASS classList.add("d") with attribute value "a b c" (XML node with null namespace) 
 PASS classList.add("d") with attribute value "a b c " (XML node with null namespace) 
-FAIL classList.add("c") with attribute value "   a  a b" (XML node with null namespace) assert_equals: wrong class after modification expected "a b c" but got "   a  a b c"
-FAIL classList.add("a") with attribute value "   a  a b" (XML node with null namespace) assert_equals: wrong class after modification expected "a b" but got "   a  a b"
-FAIL classList.add("c") with attribute value "\t\n\f\r a\t\n\f\r b\t\n\f\r " (XML node with null namespace) assert_equals: wrong class after modification expected "a b c" but got "\t\n\f\r a\t\n\f\r b\t\n\f\r c"
+FAIL classList.add("c") with attribute value "   a  a b" (XML node with null namespace) assert_equals: wrong class after modification expected "a b c" but got "a a b c"
+FAIL classList.add("a") with attribute value "   a  a b" (XML node with null namespace) assert_equals: wrong class after modification expected "a b" but got "a a b"
+PASS classList.add("c") with attribute value "\t\n\f\r a\t\n\f\r b\t\n\f\r " (XML node with null namespace) 
 PASS classList.add("d", "e") with attribute value "a b c " (XML node with null namespace) 
-FAIL classList.add("a", "a") with attribute value "a b c " (XML node with null namespace) assert_equals: wrong class after modification expected "a b c" but got "a b c "
+PASS classList.add("a", "a") with attribute value "a b c " (XML node with null namespace) 
 PASS classList.add("d", "d") with attribute value "a b c " (XML node with null namespace) 
-FAIL classList.add() with attribute value "a b c a " (XML node with null namespace) assert_equals: wrong class after modification expected "a b c" but got "a b c a "
+FAIL classList.add() with attribute value "a b c a " (XML node with null namespace) assert_equals: wrong class after modification expected "a b c" but got "a b c a"
 PASS classList.add("a", "b") with attribute value null (XML node with null namespace) 
 PASS classList.add("a", "b") with attribute value "" (XML node with null namespace) 
 PASS classList.add(null) with attribute value null (XML node with null namespace) 
@@ -1038,8 +1038,8 @@ PASS classList.remove("a ") with attribute value "a " (XML node with null namesp
 PASS classList.remove("aa ") with attribute value "aa " (XML node with null namespace) 
 PASS classList.remove("a") with attribute value null (XML node with null namespace) 
 PASS classList.remove("a") with attribute value "" (XML node with null namespace) 
-FAIL classList.remove("d") with attribute value "a b  c" (XML node with null namespace) assert_equals: wrong class after modification expected "a b c" but got "a b  c"
-FAIL classList.remove("A") with attribute value "a b  c" (XML node with null namespace) assert_equals: wrong class after modification expected "a b c" but got "a b  c"
+PASS classList.remove("d") with attribute value "a b  c" (XML node with null namespace) 
+PASS classList.remove("A") with attribute value "a b  c" (XML node with null namespace) 
 PASS classList.remove("a") with attribute value " a a a " (XML node with null namespace) 
 PASS classList.remove("a") with attribute value "a  b" (XML node with null namespace) 
 PASS classList.remove("a") with attribute value "a  b  " (XML node with null namespace) 
@@ -1057,12 +1057,12 @@ PASS classList.remove("a") with attribute value "a b a c a d a" (XML node with n
 FAIL classList.remove("AA") with attribute value "AA BB aa CC AA dd aa" (XML node with null namespace) assert_equals: wrong class after modification expected "BB aa CC dd" but got "BB aa CC dd aa"
 PASS classList.remove("a") with attribute value "\ra\na\ta\f" (XML node with null namespace) 
 PASS classList.remove("a") with attribute value "\t\n\f\r a\t\n\f\r b\t\n\f\r " (XML node with null namespace) 
-FAIL classList.remove("d", "e") with attribute value "a b c " (XML node with null namespace) assert_equals: wrong class after modification expected "a b c" but got "a b c "
+PASS classList.remove("d", "e") with attribute value "a b c " (XML node with null namespace) 
 PASS classList.remove("a", "b") with attribute value "a b c " (XML node with null namespace) 
 PASS classList.remove("a", "c") with attribute value "a b c " (XML node with null namespace) 
 PASS classList.remove("a", "a") with attribute value "a b c " (XML node with null namespace) 
-FAIL classList.remove("d", "d") with attribute value "a b c " (XML node with null namespace) assert_equals: wrong class after modification expected "a b c" but got "a b c "
-FAIL classList.remove() with attribute value "a b c " (XML node with null namespace) assert_equals: wrong class after modification expected "a b c" but got "a b c "
+PASS classList.remove("d", "d") with attribute value "a b c " (XML node with null namespace) 
+PASS classList.remove() with attribute value "a b c " (XML node with null namespace) 
 PASS classList.remove("a", "b") with attribute value null (XML node with null namespace) 
 PASS classList.remove("a", "b") with attribute value "" (XML node with null namespace) 
 FAIL classList.remove() with attribute value "a a" (XML node with null namespace) assert_equals: wrong class after modification expected "a" but got "a a"
@@ -1072,22 +1072,22 @@ PASS classList.toggle("") with attribute value null (XML node with null namespac
 PASS classList.toggle("aa ") with attribute value null (XML node with null namespace) 
 PASS classList.toggle("a") with attribute value null (XML node with null namespace) 
 PASS classList.toggle("a") with attribute value "" (XML node with null namespace) 
-FAIL classList.toggle("a") with attribute value " " (XML node with null namespace) assert_equals: wrong class after modification expected "a" but got " a"
-FAIL classList.toggle("a") with attribute value "   \f" (XML node with null namespace) assert_equals: wrong class after modification expected "a" but got "   \fa"
+PASS classList.toggle("a") with attribute value " " (XML node with null namespace) 
+PASS classList.toggle("a") with attribute value "   \f" (XML node with null namespace) 
 PASS classList.toggle("b") with attribute value "a" (XML node with null namespace) 
 PASS classList.toggle("A") with attribute value "a" (XML node with null namespace) 
 PASS classList.toggle("d") with attribute value "a b c" (XML node with null namespace) 
-FAIL classList.toggle("d") with attribute value "   a  a b" (XML node with null namespace) assert_equals: wrong class after modification expected "a b d" but got "   a  a b d"
+FAIL classList.toggle("d") with attribute value "   a  a b" (XML node with null namespace) assert_equals: wrong class after modification expected "a b d" but got "a a b d"
 PASS classList.toggle("a") with attribute value "a" (XML node with null namespace) 
 PASS classList.toggle("a") with attribute value " a a a " (XML node with null namespace) 
-FAIL classList.toggle("a") with attribute value " A A A " (XML node with null namespace) assert_equals: wrong class after modification expected "A a" but got " A A A a"
+FAIL classList.toggle("a") with attribute value " A A A " (XML node with null namespace) assert_equals: wrong class after modification expected "A a" but got "A A A a"
 PASS classList.toggle("b") with attribute value " a b c " (XML node with null namespace) 
 PASS classList.toggle("b") with attribute value " a b c b b" (XML node with null namespace) 
 PASS classList.toggle("c") with attribute value " a b  c  " (XML node with null namespace) 
 PASS classList.toggle("a") with attribute value " a b c " (XML node with null namespace) 
 FAIL classList.toggle("b") with attribute value "   a  a b" (XML node with null namespace) assert_equals: wrong class after modification expected "a" but got "a a"
 PASS classList.toggle("a") with attribute value "\t\n\f\r a\t\n\f\r b\t\n\f\r " (XML node with null namespace) 
-FAIL classList.toggle("c") with attribute value "\t\n\f\r a\t\n\f\r b\t\n\f\r " (XML node with null namespace) assert_equals: wrong class after modification expected "a b c" but got "\t\n\f\r a\t\n\f\r b\t\n\f\r c"
+PASS classList.toggle("c") with attribute value "\t\n\f\r a\t\n\f\r b\t\n\f\r " (XML node with null namespace) 
 PASS classList.toggle(null) with attribute value "null" (XML node with null namespace) 
 PASS classList.toggle(null) with attribute value "" (XML node with null namespace) 
 PASS classList.toggle(undefined) with attribute value "undefined" (XML node with null namespace) 
@@ -1311,21 +1311,21 @@ PASS classList.add("a", "aa ") with attribute value null (foo node)
 PASS classList.add("a") with attribute value "a" (foo node) 
 PASS classList.add("AA") with attribute value "aa" (foo node) 
 PASS classList.add("a") with attribute value "a b c" (foo node) 
-FAIL classList.add("a") with attribute value "a a a  b" (foo node) assert_equals: wrong class after modification expected "a b" but got "a a a  b"
+FAIL classList.add("a") with attribute value "a a a  b" (foo node) assert_equals: wrong class after modification expected "a b" but got "a a a b"
 PASS classList.add("a") with attribute value null (foo node) 
 PASS classList.add("a") with attribute value "" (foo node) 
-FAIL classList.add("a") with attribute value " " (foo node) assert_equals: wrong class after modification expected "a" but got " a"
-FAIL classList.add("a") with attribute value "   \f" (foo node) assert_equals: wrong class after modification expected "a" but got "   \fa"
+PASS classList.add("a") with attribute value " " (foo node) 
+PASS classList.add("a") with attribute value "   \f" (foo node) 
 PASS classList.add("b") with attribute value "a" (foo node) 
 PASS classList.add("d") with attribute value "a b c" (foo node) 
 PASS classList.add("d") with attribute value "a b c " (foo node) 
-FAIL classList.add("c") with attribute value "   a  a b" (foo node) assert_equals: wrong class after modification expected "a b c" but got "   a  a b c"
-FAIL classList.add("a") with attribute value "   a  a b" (foo node) assert_equals: wrong class after modification expected "a b" but got "   a  a b"
-FAIL classList.add("c") with attribute value "\t\n\f\r a\t\n\f\r b\t\n\f\r " (foo node) assert_equals: wrong class after modification expected "a b c" but got "\t\n\f\r a\t\n\f\r b\t\n\f\r c"
+FAIL classList.add("c") with attribute value "   a  a b" (foo node) assert_equals: wrong class after modification expected "a b c" but got "a a b c"
+FAIL classList.add("a") with attribute value "   a  a b" (foo node) assert_equals: wrong class after modification expected "a b" but got "a a b"
+PASS classList.add("c") with attribute value "\t\n\f\r a\t\n\f\r b\t\n\f\r " (foo node) 
 PASS classList.add("d", "e") with attribute value "a b c " (foo node) 
-FAIL classList.add("a", "a") with attribute value "a b c " (foo node) assert_equals: wrong class after modification expected "a b c" but got "a b c "
+PASS classList.add("a", "a") with attribute value "a b c " (foo node) 
 PASS classList.add("d", "d") with attribute value "a b c " (foo node) 
-FAIL classList.add() with attribute value "a b c a " (foo node) assert_equals: wrong class after modification expected "a b c" but got "a b c a "
+FAIL classList.add() with attribute value "a b c a " (foo node) assert_equals: wrong class after modification expected "a b c" but got "a b c a"
 PASS classList.add("a", "b") with attribute value null (foo node) 
 PASS classList.add("a", "b") with attribute value "" (foo node) 
 PASS classList.add(null) with attribute value null (foo node) 
@@ -1345,8 +1345,8 @@ PASS classList.remove("a ") with attribute value "a " (foo node)
 PASS classList.remove("aa ") with attribute value "aa " (foo node) 
 PASS classList.remove("a") with attribute value null (foo node) 
 PASS classList.remove("a") with attribute value "" (foo node) 
-FAIL classList.remove("d") with attribute value "a b  c" (foo node) assert_equals: wrong class after modification expected "a b c" but got "a b  c"
-FAIL classList.remove("A") with attribute value "a b  c" (foo node) assert_equals: wrong class after modification expected "a b c" but got "a b  c"
+PASS classList.remove("d") with attribute value "a b  c" (foo node) 
+PASS classList.remove("A") with attribute value "a b  c" (foo node) 
 PASS classList.remove("a") with attribute value " a a a " (foo node) 
 PASS classList.remove("a") with attribute value "a  b" (foo node) 
 PASS classList.remove("a") with attribute value "a  b  " (foo node) 
@@ -1364,12 +1364,12 @@ PASS classList.remove("a") with attribute value "a b a c a d a" (foo node)
 FAIL classList.remove("AA") with attribute value "AA BB aa CC AA dd aa" (foo node) assert_equals: wrong class after modification expected "BB aa CC dd" but got "BB aa CC dd aa"
 PASS classList.remove("a") with attribute value "\ra\na\ta\f" (foo node) 
 PASS classList.remove("a") with attribute value "\t\n\f\r a\t\n\f\r b\t\n\f\r " (foo node) 
-FAIL classList.remove("d", "e") with attribute value "a b c " (foo node) assert_equals: wrong class after modification expected "a b c" but got "a b c "
+PASS classList.remove("d", "e") with attribute value "a b c " (foo node) 
 PASS classList.remove("a", "b") with attribute value "a b c " (foo node) 
 PASS classList.remove("a", "c") with attribute value "a b c " (foo node) 
 PASS classList.remove("a", "a") with attribute value "a b c " (foo node) 
-FAIL classList.remove("d", "d") with attribute value "a b c " (foo node) assert_equals: wrong class after modification expected "a b c" but got "a b c "
-FAIL classList.remove() with attribute value "a b c " (foo node) assert_equals: wrong class after modification expected "a b c" but got "a b c "
+PASS classList.remove("d", "d") with attribute value "a b c " (foo node) 
+PASS classList.remove() with attribute value "a b c " (foo node) 
 PASS classList.remove("a", "b") with attribute value null (foo node) 
 PASS classList.remove("a", "b") with attribute value "" (foo node) 
 FAIL classList.remove() with attribute value "a a" (foo node) assert_equals: wrong class after modification expected "a" but got "a a"
@@ -1379,22 +1379,22 @@ PASS classList.toggle("") with attribute value null (foo node)
 PASS classList.toggle("aa ") with attribute value null (foo node) 
 PASS classList.toggle("a") with attribute value null (foo node) 
 PASS classList.toggle("a") with attribute value "" (foo node) 
-FAIL classList.toggle("a") with attribute value " " (foo node) assert_equals: wrong class after modification expected "a" but got " a"
-FAIL classList.toggle("a") with attribute value "   \f" (foo node) assert_equals: wrong class after modification expected "a" but got "   \fa"
+PASS classList.toggle("a") with attribute value " " (foo node) 
+PASS classList.toggle("a") with attribute value "   \f" (foo node) 
 PASS classList.toggle("b") with attribute value "a" (foo node) 
 PASS classList.toggle("A") with attribute value "a" (foo node) 
 PASS classList.toggle("d") with attribute value "a b c" (foo node) 
-FAIL classList.toggle("d") with attribute value "   a  a b" (foo node) assert_equals: wrong class after modification expected "a b d" but got "   a  a b d"
+FAIL classList.toggle("d") with attribute value "   a  a b" (foo node) assert_equals: wrong class after modification expected "a b d" but got "a a b d"
 PASS classList.toggle("a") with attribute value "a" (foo node) 
 PASS classList.toggle("a") with attribute value " a a a " (foo node) 
-FAIL classList.toggle("a") with attribute value " A A A " (foo node) assert_equals: wrong class after modification expected "A a" but got " A A A a"
+FAIL classList.toggle("a") with attribute value " A A A " (foo node) assert_equals: wrong class after modification expected "A a" but got "A A A a"
 PASS classList.toggle("b") with attribute value " a b c " (foo node) 
 PASS classList.toggle("b") with attribute value " a b c b b" (foo node) 
 PASS classList.toggle("c") with attribute value " a b  c  " (foo node) 
 PASS classList.toggle("a") with attribute value " a b c " (foo node) 
 FAIL classList.toggle("b") with attribute value "   a  a b" (foo node) assert_equals: wrong class after modification expected "a" but got "a a"
 PASS classList.toggle("a") with attribute value "\t\n\f\r a\t\n\f\r b\t\n\f\r " (foo node) 
-FAIL classList.toggle("c") with attribute value "\t\n\f\r a\t\n\f\r b\t\n\f\r " (foo node) assert_equals: wrong class after modification expected "a b c" but got "\t\n\f\r a\t\n\f\r b\t\n\f\r c"
+PASS classList.toggle("c") with attribute value "\t\n\f\r a\t\n\f\r b\t\n\f\r " (foo node) 
 PASS classList.toggle(null) with attribute value "null" (foo node) 
 PASS classList.toggle(null) with attribute value "" (foo node) 
 PASS classList.toggle(undefined) with attribute value "undefined" (foo node)