<!doctype html>
<html>
<head>
<meta charset="utf8">
<link rel="help" href="http://url.spec.whatwg.org/#dom-urlsearchparams-delete">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script>
test(function() {
    var params = new URLSearchParams('a=b&c=d');
    params.delete('a');
    assert_equals(params + '', 'c=d');
    params = new URLSearchParams('a=a&b=b&a=a&c=c');
    params.delete('a');
    assert_equals(params + '', 'b=b&c=c');
    params = new URLSearchParams('a=a&=&b=b&c=c');
    params.delete('');
    assert_equals(params + '', 'a=a&b=b&c=c');
    params = new URLSearchParams('a=a&null=null&b=b');
    params.delete(null);
    assert_equals(params + '', 'a=a&b=b');
    params = new URLSearchParams('a=a&undefined=undefined&b=b');
    params.delete(undefined);
    assert_equals(params + '', 'a=a&b=b');
}, 'Delete basics');

test(function() {
    var params = new URLSearchParams();
    params.append('first', 1);
    assert_true(params.has('first'), 'Search params object has name "first"');
    assert_equals(params.get('first'), '1', 'Search params object has name "first" with value "1"');
    params.delete('first');
    assert_false(params.has('first'), 'Search params object has no "first" name');
    params.append('first', 1);
    params.append('first', 10);
    params.delete('first');
    assert_false(params.has('first'), 'Search params object has no "first" name');
}, 'Deleting appended multiple');

test(function() {
    var url = new URL('http://example.com/?param1&param2');
    url.searchParams.delete('param1');
    url.searchParams.delete('param2');
    assert_equals(url.href, 'http://example.com/', 'url.href does not have ?');
    assert_equals(url.search, '', 'url.search does not have ?');
}, 'Deleting all params removes ? from URL');

test(function() {
    var url = new URL('http://example.com/?');
    url.searchParams.delete('param1');
    assert_equals(url.href, 'http://example.com/', 'url.href does not have ?');
    assert_equals(url.search, '', 'url.search does not have ?');
}, 'Removing non-existent param removes ? from URL');
</script>
</head>
</html>