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Test Info:

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');
test(() => {
const url = new URL('data:space ?test');
assert_true(url.searchParams.has('test'));
url.searchParams.delete('test');
assert_false(url.searchParams.has('test'));
assert_equals(url.search, '');
assert_equals(url.pathname, 'space');
assert_equals(url.href, 'data:space');
}, 'Changing the query of a URL with an opaque path can impact the path');
test(() => {
const url = new URL('data:space ?test#test');
url.searchParams.delete('test');
assert_equals(url.search, '');
assert_equals(url.pathname, 'space ');
assert_equals(url.href, 'data:space #test');
}, 'Changing the query of a URL with an opaque path can impact the path if the URL has no fragment');
test(() => {
const params = new URLSearchParams();
params.append('a', 'b');
params.append('a', 'c');
params.append('a', 'd');
params.delete('a', 'c');
assert_equals(params.toString(), 'a=b&a=d');
}, "Two-argument delete()");
test(() => {
const params = new URLSearchParams();
params.append('a', 'b');
params.append('a', 'c');
params.append('b', 'c');
params.append('b', 'd');
params.delete('b', 'c');
params.delete('a', undefined);
assert_equals(params.toString(), 'b=d');
}, "Two-argument delete() respects undefined as second arg");