| <!DOCTYPE html> |
| <meta charset="utf-8"> |
| <title>History restoration order test</title> |
| <meta name="assert" content="https://html.spec.whatwg.org/multipage/browsing-the-web.html#history-traversal"> |
| <meta name="assert" content="Traversing history should restore scroll position after dispatching popstate and before dispatching hashchange"> |
| |
| <style> |
| body { |
| height: 200vh; |
| width: 200vw; |
| } |
| </style> |
| |
| <script src="/resources/testharness.js"></script> |
| <script src="/resources/testharnessreport.js"></script> |
| <script> |
| 'use strict'; |
| async_test(function(t) { |
| window.addEventListener('load', t.step_func(function() { |
| // Allow 1px epsilon for fractional scrolling. |
| assert_array_approx_equals(scrollPosition(), [0, 0], 1); |
| |
| history.pushState('#1', '', '#1'); |
| window.scrollTo(50, 100); |
| assert_array_approx_equals(scrollPosition(), [50, 100], 1); |
| |
| history.pushState('#2', '', '#2'); |
| window.scrollTo(100, 200); |
| assert_array_approx_equals(scrollPosition(), [100, 200], 1); |
| |
| setTimeout(t.step_func(function(){ |
| history.pushState(null, null, '#done'); |
| window.scrollTo(555, 555); |
| assert_array_approx_equals(scrollPosition(), [555, 555], 1); |
| // Kick off the verification. |
| window.history.back(); |
| }), 0); |
| })); |
| |
| window.addEventListener('popstate', t.step_func(function() { |
| // Verify that scroll position is *not* restored before popstate. |
| const key = location.hash; |
| const expected_scroll_position = expectedScrollPositionForKey(key); |
| assert_not_equals(scrollPosition()[0], expected_scroll_position[0], `scroll is restored before popstate for ${key}`); |
| assert_not_equals(scrollPosition()[1], expected_scroll_position[1], `scroll is restored before popstate for ${key}`); |
| |
| if (key == '') |
| t.done(); |
| else |
| setTimeout(t.step_func(function(){ window.history.back(); }), 0); |
| })); |
| |
| window.addEventListener('hashchange', t.step_func(function() { |
| // Verify that scroll position is restored before hashchange. |
| var key = location.hash; |
| const expected_scroll_position = expectedScrollPositionForKey(key); |
| assert_array_approx_equals(scrollPosition(), expected_scroll_position, 1, `scroll is restored before hashchange for ${key}`); |
| })); |
| |
| function scrollPosition() { |
| return [window.pageXOffset, window.pageYOffset]; |
| } |
| |
| function expectedScrollPositionForKey(key) { |
| switch (key) { |
| case '#2': return [100, 200]; |
| case '#1': return [50, 100]; |
| case '' : return [0, 0]; |
| default: assert_unreached(); |
| } |
| } |
| |
| }, 'Traversing history should restore scroll position after dispatching popstate and before dispatching hashchange'); |
| </script> |
