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 7cf585f340c74c592cc137f22bcfb49747bc5d46..c7760753c8311640774c4c5176cb2161e56e10b2 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; 745 PASS, 390 FAIL, 0 TIMEOUT, 0 NOTRUN.
+Found 1135 tests; 805 PASS, 330 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) 
@@ -81,21 +81,21 @@ 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) 
@@ -115,8 +115,8 @@ 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) 
@@ -134,12 +134,12 @@ 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"
@@ -149,22 +149,22 @@ 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) 
@@ -386,21 +386,21 @@ 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) 
@@ -420,8 +420,8 @@ 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) 
@@ -439,12 +439,12 @@ 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"
@@ -454,22 +454,22 @@ 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) 
@@ -691,21 +691,21 @@ 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) 
@@ -725,8 +725,8 @@ 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) 
@@ -744,12 +744,12 @@ 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"
@@ -759,22 +759,22 @@ 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) 
@@ -996,21 +996,21 @@ 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) 
@@ -1030,8 +1030,8 @@ 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) 
@@ -1049,12 +1049,12 @@ 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"
@@ -1064,22 +1064,22 @@ 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) 
@@ -1301,21 +1301,21 @@ 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) 
@@ -1335,8 +1335,8 @@ 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) 
@@ -1354,12 +1354,12 @@ 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"
@@ -1369,22 +1369,22 @@ 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)