<!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>
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