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<!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>
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