Implement value for DOMTokenList

7 files changed, 44 insertions, 15 deletions

diff --git a/components/script/dom/domtokenlist.rs b/components/script/dom/domtokenlist.rs
index fd1644f17c7..f74887d0899 100644
--- a/components/script/dom/domtokenlist.rs
+++ b/components/script/dom/domtokenlist.rs
@@ -129,6 +129,16 @@ impl DOMTokenListMethods for DOMTokenList {
         }
     }
 
+    // https://dom.spec.whatwg.org/#dom-domtokenlist-value
+    fn Value(&self) -> DOMString {
+        self.element.get_string_attribute(&self.local_name)
+    }
+
+    // https://dom.spec.whatwg.org/#dom-domtokenlist-value
+    fn SetValue(&self, value: DOMString) {
+        self.element.set_tokenlist_attribute(&self.local_name, value);
+    }
+
     // https://dom.spec.whatwg.org/#concept-dtl-serialize
     fn Stringifier(&self) -> DOMString {
         self.element.get_string_attribute(&self.local_name)
diff --git a/components/script/dom/webidls/DOMTokenList.webidl b/components/script/dom/webidls/DOMTokenList.webidl
index 746bc8ac521..c9125285f74 100644
--- a/components/script/dom/webidls/DOMTokenList.webidl
+++ b/components/script/dom/webidls/DOMTokenList.webidl
@@ -19,5 +19,8 @@ interface DOMTokenList {
   [Throws]
   boolean toggle(DOMString token, optional boolean force);
 
+  [Pure]
+           attribute DOMString value;
+
   stringifier;
 };
diff --git a/components/script/dom/webidls/Element.webidl b/components/script/dom/webidls/Element.webidl
index 009fb999856..900c2eb24dc 100644
--- a/components/script/dom/webidls/Element.webidl
+++ b/components/script/dom/webidls/Element.webidl
@@ -28,7 +28,7 @@ interface Element : Node {
            attribute DOMString id;
   [Pure]
            attribute DOMString className;
-  [SameObject]
+  [SameObject, PutForwards=value]
   readonly attribute DOMTokenList classList;
 
   [SameObject]
diff --git a/tests/wpt/metadata/MANIFEST.json b/tests/wpt/metadata/MANIFEST.json
index 1085d8668a7..98aaa6d001e 100644
--- a/tests/wpt/metadata/MANIFEST.json
+++ b/tests/wpt/metadata/MANIFEST.json
@@ -34514,6 +34514,12 @@
     "deleted": [],
     "items": {
       "testharness": {
+        "dom/lists/DOMTokenList-value.html": [
+          {
+            "path": "dom/lists/DOMTokenList-value.html",
+            "url": "/dom/lists/DOMTokenList-value.html"
+          }
+        ],
         "html/webappapis/scripting/events/event-handler-processing-algorithm.html": [
           {
             "path": "html/webappapis/scripting/events/event-handler-processing-algorithm.html",
diff --git a/tests/wpt/metadata/dom/interfaces.html.ini b/tests/wpt/metadata/dom/interfaces.html.ini
index 2d0458f453a..c9c0283d992 100644
--- a/tests/wpt/metadata/dom/interfaces.html.ini
+++ b/tests/wpt/metadata/dom/interfaces.html.ini
@@ -162,18 +162,12 @@
   [DOMSettableTokenList interface object name]
     expected: FAIL
 
-  [Element interface: attribute classList]
-    expected: FAIL
-
   [DOMTokenList interface: operation replace(DOMString,DOMString)]
     expected: FAIL
 
   [DOMTokenList interface: operation supports(DOMString)]
     expected: FAIL
 
-  [DOMTokenList interface: attribute value]
-    expected: FAIL
-
   [DOMTokenList interface: document.body.classList must inherit property "replace" with the proper type (6)]
     expected: FAIL
 
@@ -186,6 +180,3 @@
   [DOMTokenList interface: calling supports(DOMString) on document.body.classList with too few arguments must throw TypeError]
     expected: FAIL
 
-  [DOMTokenList interface: document.body.classList must inherit property "value" with the proper type (8)]
-    expected: FAIL
-
diff --git a/tests/wpt/metadata/dom/nodes/Element-classlist.html.ini b/tests/wpt/metadata/dom/nodes/Element-classlist.html.ini
deleted file mode 100644
index bbaaad3e9e9..00000000000
--- a/tests/wpt/metadata/dom/nodes/Element-classlist.html.ini
+++ /dev/null
@@ -1,5 +0,0 @@
-[Element-classlist.html]
-  type: testharness
-  [classList must have [PutForwards=value\]]
-    expected: FAIL
-
diff --git a/tests/wpt/web-platform-tests/dom/lists/DOMTokenList-value.html b/tests/wpt/web-platform-tests/dom/lists/DOMTokenList-value.html
new file mode 100644
index 00000000000..b0e39111d91
--- /dev/null
+++ b/tests/wpt/web-platform-tests/dom/lists/DOMTokenList-value.html
@@ -0,0 +1,24 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>DOMTokenList value</title>
+<link rel=help href="https://dom.spec.whatwg.org/#dom-domtokenlist-value">
+<link rel=author title=Tangresh href="mailto:dmenzi@tangresh.ch">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<span class="   a  a b "></span>
+<script>
+test(function() {
+  assert_equals(String(document.createElement("span").classList.value), "",
+                "classList.value should return the empty list for an undefined class attribute");
+  var span = document.querySelector("span");
+  assert_equals(span.classList.value, "   a  a b ",
+                "value should return the literal value");
+  span.classList.value = " foo bar foo ";
+  assert_equals(span.classList.value, " foo bar foo ",
+                "assigning value should set the literal value");
+  assert_equals(span.classList.length, 2,
+                "length should be the number of tokens");
+  assert_class_string(span.classList, "DOMTokenList");
+  assert_class_string(span.classList.value, "String");
+});
+</script>