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<!DOCTYPE html>
<meta charset="utf-8">
<link rel="help" href="https://w3c.github.io/selection-api/#selectionchange-event">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<body>
<div id="container"><br><br></div>
<script>
promise_test(() => {
return new Promise(resolve => {
let didFireSelectionChangeEvent = false;
document.addEventListener("selectionchange", () => { didFireSelectionChangeEvent = true; resolve(); }, {once: true});
getSelection().setPosition(container, 0);
assert_false(didFireSelectionChangeEvent);
});
}, "selectionchange event on document fires");
promise_test(() => {
return (async function() {
let selectionChangeCount = 0;
document.addEventListener("selectionchange", () => ++selectionChangeCount);
container.innerHTML = '<span><br></span><span><br></span>';
getSelection().setPosition(container, 0);
assert_equals(selectionChangeCount, 0);
getSelection().setPosition(container, 2);
assert_equals(selectionChangeCount, 0);
await new Promise(setTimeout);
assert_equals(selectionChangeCount, 1);
})();
}, "selectionchange event on document fires once");
promise_test(() => {
return (async function() {
let selectionChangeCount = 0;
document.addEventListener("selectionchange", () => ++selectionChangeCount);
container.innerHTML = '<span><br></span><span><br></span>';
getSelection().setPosition(container, 0);
assert_equals(selectionChangeCount, 0);
getSelection().setPosition(container, 2);
assert_equals(selectionChangeCount, 0);
await new Promise(setTimeout);
assert_equals(selectionChangeCount, 1);
getSelection().setPosition(container, 0);
assert_equals(selectionChangeCount, 1);
getSelection().setPosition(container, 2);
assert_equals(selectionChangeCount, 1);
await new Promise(setTimeout);
assert_equals(selectionChangeCount, 2);
})();
}, "task to fire selectionchange event gets queued each time selection is mutated");
promise_test(() => {
return (async function() {
let selectionChangeCount = 0;
document.addEventListener("selectionchange", () => {
if (!selectionChangeCount) {
getSelection().setPosition(container, 2);
getSelection().setPosition(container, 0);
}
++selectionChangeCount;
});
container.innerHTML = '<b><br></b><b><br></b>';
getSelection().setPosition(container, 0);
assert_equals(selectionChangeCount, 0);
await new Promise(setTimeout);
assert_equals(selectionChangeCount, 1);
await new Promise(setTimeout);
assert_equals(selectionChangeCount, 2);
})();
}, "has scheduled selectionchange event is set to false at the beginning of a task to fire selectionchange event");
</script>
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