<!doctype html> <html> <head> <meta charset="utf8"> <link rel="help" href="http://url.spec.whatwg.org/#dom-urlsearchparams-set"> <script src="/resources/testharness.js"></script> <script src="/resources/testharnessreport.js"></script> <script src="resources/testharness-extras.js"></script> <script> test(function() { var params = new URLSearchParams('a=b&c=d'); params.set('a', 'B'); assert_equals(params + '', 'a=B&c=d'); params = new URLSearchParams('a=b&c=d&a=e'); params.set('a', 'B'); assert_equals(params + '', 'a=B&c=d') params.set('e', 'f'); assert_equals(params + '', 'a=B&c=d&e=f') }, 'Set basics'); test(function() { var params = new URLSearchParams('a=1&a=2&a=3'); assert_true(params.has('a'), 'Search params object has name "a"'); assert_equals(params.get('a'), '1', 'Search params object has name "a" with value "1"'); params.set('first', 4); assert_true(params.has('a'), 'Search params object has name "a"'); assert_equals(params.get('a'), '1', 'Search params object has name "a" with value "1"'); params.set('a', 4); assert_true(params.has('a'), 'Search params object has name "a"'); assert_equals(params.get('a'), '4', 'Search params object has name "a" with value "4"'); }, 'URLSearchParams.set'); </script> </head> </html>