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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¶m2'); 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');