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<title>Test same-URL navigation and its effects on history</title>
<script src=/resources/testharness.js></script>
<script src=/resources/testharnessreport.js></script>
<div id=log></div>
<iframe src=resources/a.html></iframe>
<script>
async_test((t) => {
let state = "begin"
self[0].frameElement.onload = t.step_func(() => {
if(state === "b first") {
assert_equals(history.length, 2)
state = "c first"
navigateFrameAfterDelay(t, "resources/c.html")
} else if (state === "c first") {
assert_equals(history.length, 3)
state = "a second"
history.back(2)
} else if (state === "a second") {
assert_equals(history.length, 3)
state = "a third"
navigateFrameAfterDelay(t, "resources/a.html")
} else if (state === "a third") {
assert_equals(history.length, 3)
t.done()
}
})
onload = t.step_func(() => {
assert_equals(state, "begin")
assert_equals(history.length, 1)
state = "b first"
navigateFrameAfterDelay(t, "resources/b.html")
})
})
function navigateFrameAfterDelay(t, url) {
// Delay to avoid triggering the "replace" behavior which occurs if
// the page isn't yet completely loaded, which only occurs after the
// load event handlers have finished:
// https://html.spec.whatwg.org/#location-object-navigate
// https://html.spec.whatwg.org/#the-end:completely-finish-loading
t.step_timeout(() => {
self[0].location = url
}, 0)
}
</script>
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