1 files changed, 179 insertions, 0 deletions
diff --git a/testing/web-platform/tests/dom/collections/HTMLCollection-supported-property-indices.html b/testing/web-platform/tests/dom/collections/HTMLCollection-supported-property-indices.html
new file mode 100644
index 0000000000..5339ec31ea
--- /dev/null
+++ b/testing/web-platform/tests/dom/collections/HTMLCollection-supported-property-indices.html
@@ -0,0 +1,179 @@
+<!doctype html>
+<meta charset=utf-8>
+<title></title>
+<script src=/resources/testharness.js></script>
+<script src=/resources/testharnessreport.js></script>
+<!-- We want to use a tag name that will not interact with our test harness,
+     so just make one up.  "foo" is a good one -->
+
+<!-- Ids that look like negative indices.  These should come first, so we can
+     assert that lookups for nonnegative indices find these by index -->
+<foo id="-2"></foo>
+<foo id="-1"></foo>
+
+<!-- Ids that look like nonnegative indices -->
+<foo id="0"></foo>
+<foo id="1"></foo>
+
+<!-- Ids that look like nonnegative indices near 2^31 = 2147483648 -->
+<foo id="2147483645"></foo> <!-- 2^31 - 3 -->
+<foo id="2147483646"></foo> <!-- 2^31 - 2 -->
+<foo id="2147483647"></foo> <!-- 2^31 - 1 -->
+<foo id="2147483648"></foo> <!-- 2^31 -->
+<foo id="2147483649"></foo> <!-- 2^31 + 1 -->
+
+<!-- Ids that look like nonnegative indices near 2^32 = 4294967296 -->
+<foo id="4294967293"></foo> <!-- 2^32 - 3 -->
+<foo id="4294967294"></foo> <!-- 2^32 - 2 -->
+<foo id="4294967295"></foo> <!-- 2^32 - 1 -->
+<foo id="4294967296"></foo> <!-- 2^32 -->
+<foo id="4294967297"></foo> <!-- 2^32 + 1 -->
+
+<script>
+test(function() {
+  var collection = document.getElementsByTagName("foo");
+  assert_equals(collection.item(-2), null);
+  assert_equals(collection.item(-1), null);
+  assert_equals(collection.namedItem(-2), document.getElementById("-2"));
+  assert_equals(collection.namedItem(-1), document.getElementById("-1"));
+  assert_equals(collection[-2], document.getElementById("-2"));
+  assert_equals(collection[-1], document.getElementById("-1"));
+}, "Handling of property names that look like negative integers");
+
+test(function() {
+  var collection = document.getElementsByTagName("foo");
+  assert_equals(collection.item(0), document.getElementById("-2"));
+  assert_equals(collection.item(1), document.getElementById("-1"));
+  assert_equals(collection.namedItem(0), document.getElementById("0"));
+  assert_equals(collection.namedItem(1), document.getElementById("1"));
+  assert_equals(collection[0], document.getElementById("-2"));
+  assert_equals(collection[1], document.getElementById("-1"));
+}, "Handling of property names that look like small nonnegative integers");
+
+test(function() {
+  var collection = document.getElementsByTagName("foo");
+  assert_equals(collection.item(2147483645), null);
+  assert_equals(collection.item(2147483646), null);
+  assert_equals(collection.item(2147483647), null);
+  assert_equals(collection.item(2147483648), null);
+  assert_equals(collection.item(2147483649), null);
+  assert_equals(collection.namedItem(2147483645),
+                document.getElementById("2147483645"));
+  assert_equals(collection.namedItem(2147483646),
+                document.getElementById("2147483646"));
+  assert_equals(collection.namedItem(2147483647),
+                document.getElementById("2147483647"));
+  assert_equals(collection.namedItem(2147483648),
+                document.getElementById("2147483648"));
+  assert_equals(collection.namedItem(2147483649),
+                document.getElementById("2147483649"));
+  assert_equals(collection[2147483645], undefined);
+  assert_equals(collection[2147483646], undefined);
+  assert_equals(collection[2147483647], undefined);
+  assert_equals(collection[2147483648], undefined);
+  assert_equals(collection[2147483649], undefined);
+}, "Handling of property names that look like integers around 2^31");
+
+test(function() {
+  var collection = document.getElementsByTagName("foo");
+  assert_equals(collection.item(4294967293), null);
+  assert_equals(collection.item(4294967294), null);
+  assert_equals(collection.item(4294967295), null);
+  assert_equals(collection.item(4294967296), document.getElementById("-2"));
+  assert_equals(collection.item(4294967297), document.getElementById("-1"));
+  assert_equals(collection.namedItem(4294967293),
+                document.getElementById("4294967293"));
+  assert_equals(collection.namedItem(4294967294),
+                document.getElementById("4294967294"));
+  assert_equals(collection.namedItem(4294967295),
+                document.getElementById("4294967295"));
+  assert_equals(collection.namedItem(4294967296),
+                document.getElementById("4294967296"));
+  assert_equals(collection.namedItem(4294967297),
+                document.getElementById("4294967297"));
+  assert_equals(collection[4294967293], undefined);
+  assert_equals(collection[4294967294], undefined);
+  assert_equals(collection[4294967295], document.getElementById("4294967295"));
+  assert_equals(collection[4294967296], document.getElementById("4294967296"));
+  assert_equals(collection[4294967297], document.getElementById("4294967297"));
+}, "Handling of property names that look like integers around 2^32");
+
+test(function() {
+  var elements = document.getElementsByTagName("foo");
+  var old_item = elements[0];
+  var old_desc = Object.getOwnPropertyDescriptor(elements, 0);
+  assert_equals(old_desc.value, old_item);
+  assert_true(old_desc.enumerable);
+  assert_true(old_desc.configurable);
+  assert_false(old_desc.writable);
+
+  elements[0] = 5;
+  assert_equals(elements[0], old_item);
+  assert_throws_js(TypeError, function() {
+    "use strict";
+    elements[0] = 5;
+  });
+  assert_throws_js(TypeError, function() {
+    Object.defineProperty(elements, 0, { value: 5 });
+  });
+
+  delete elements[0];
+  assert_equals(elements[0], old_item);
+
+  assert_throws_js(TypeError, function() {
+    "use strict";
+    delete elements[0];
+  });
+  assert_equals(elements[0], old_item);
+}, 'Trying to set an expando that would shadow an already-existing indexed property');
+
+test(function() {
+  var elements = document.getElementsByTagName("foo");
+  var idx = elements.length;
+  var old_item = elements[idx];
+  var old_desc = Object.getOwnPropertyDescriptor(elements, idx);
+  assert_equals(old_item, undefined);
+  assert_equals(old_desc, undefined);
+
+  // [[DefineOwnProperty]] will disallow defining an indexed expando.
+  elements[idx] = 5;
+  assert_equals(elements[idx], undefined);
+  assert_throws_js(TypeError, function() {
+    "use strict";
+    elements[idx] = 5;
+  });
+  assert_throws_js(TypeError, function() {
+    Object.defineProperty(elements, idx, { value: 5 });
+  });
+
+  // Check that deletions out of range do not throw
+  delete elements[idx];
+  (function() {
+    "use strict";
+    delete elements[idx];
+  })();
+}, 'Trying to set an expando with an indexed property name past the end of the list');
+
+test(function(){
+  var elements = document.getElementsByTagName("foo");
+  var old_item = elements[0];
+  var old_desc = Object.getOwnPropertyDescriptor(elements, 0);
+  assert_equals(old_desc.value, old_item);
+  assert_true(old_desc.enumerable);
+  assert_true(old_desc.configurable);
+  assert_false(old_desc.writable);
+
+  Object.prototype[0] = 5;
+  this.add_cleanup(function () { delete Object.prototype[0]; });
+  assert_equals(elements[0], old_item);
+
+  delete elements[0];
+  assert_equals(elements[0], old_item);
+
+  assert_throws_js(TypeError, function() {
+    "use strict";
+    delete elements[0];
+  });
+  assert_equals(elements[0], old_item);
+}, 'Trying to delete an indexed property name should never work');
+</script>