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Test Info:
- This WPT test may be referenced by the following Test IDs:
- /uievents/mouse/mouse_boundary_events_after_reappending_last_over_target.tentative.html - WPT Dashboard Interop Dashboard
<!doctype html>
<html>
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Temporary removal of "mouseover" target should not be considered as the last over element is changed</title>
<script src=/resources/testharness.js></script>
<script src=/resources/testharnessreport.js></script>
<script src=/resources/testdriver.js></script>
<script src=/resources/testdriver-actions.js></script>
<script src=/resources/testdriver-vendor.js></script>
<script>
"use strict";
function stringifyEvents(eventArray) {
if (!eventArray.length) {
return "[]";
}
let result = "";
eventArray.forEach(event => {
if (result != "") {
result += ", ";
}
result += `${event.type}@${
event.target?.nodeType == Node.ELEMENT_NODE
? `${event.target.localName}${
event.target.id ? `#${event.target.id}` : ""
}`
: event.target?.localName
}`;
});
return result;
}
addEventListener("load", () => {
function promiseTick() {
return new Promise(resolve => requestAnimationFrame(() => requestAnimationFrame(resolve)));
}
function append3NestedDivElementsToBody() {
const div1 = document.createElement("div");
div1.setAttribute("id", "grandparent");
div1.setAttribute("style", "width: 32px; height: 32px; margin: 32px");
const div2 = document.createElement("div");
div2.setAttribute("id", "parent");
div2.setAttribute("style", "width: 32px; height: 32px");
const div3 = document.createElement("div");
div3.setAttribute("id", "child");
div3.setAttribute("style", "width: 32px; height: 32px");
div1.appendChild(div2);
div2.appendChild(div3);
document.body.appendChild(div1);
return { div1, div2, div3 };
}
promise_test(async () => {
const {div1, div2, div3} = append3NestedDivElementsToBody();
const bodyRect = document.body.getBoundingClientRect();
const div3Rect = div3.getBoundingClientRect();
let events = [];
for (const type of ["mouseenter", "mouseleave", "mouseover", "mouseout", "mousemove"]) {
for (const node of [document.body, div1, div2, div3]) {
node.addEventListener(type, event => {
if (event.target == node) {
events.push({type: event.type, target: event.target});
}
}, {capture: true});
}
}
let firstMouseOver = true;
div3.addEventListener("mouseover", event => {
// Temporarily remove div3 from div2, but append to the same position.
div2.appendChild(div3);
events = [];
events.push({type: event.type, target: event.target});
}, {once: true});
await new test_driver.Actions()
.pointerMove(1, 1, {})
.pointerMove(div3Rect.x + 10, div3Rect.y + 10, {})
.send();
const expectedEvents = [
{ type: "mouseover", target: div3 },
{ type: "mouseenter", target: document.body },
{ type: "mouseenter", target: div1 },
{ type: "mouseenter", target: div2 },
{ type: "mouseenter", target: div3 },
{ type: "mousemove", target: div3 },
// Removing the node temporarily should not cause mouse boundary events.
];
assert_equals(
stringifyEvents(events),
stringifyEvents(expectedEvents),
);
div1.remove();
await new test_driver.Actions()
.pointerMove(1, 1, {})
.send();
},
"After re-appending the last over element at mouseover, " +
"mouse boundary events should be fired as just over on the target");
promise_test(async () => {
const {div1, div2, div3} = append3NestedDivElementsToBody();
const bodyRect = document.body.getBoundingClientRect();
const div3Rect = div3.getBoundingClientRect();
let events = [];
for (const type of ["mouseenter", "mouseleave", "mouseover", "mouseout", "mousemove"]) {
for (const node of [document.body, div1, div2, div3]) {
node.addEventListener(type, event => {
if (event.target == node) {
events.push({type: event.type, target: event.target});
}
}, {capture: true});
}
}
div3.addEventListener("mouseover", event => {
div3.addEventListener("mouseenter", () => {
// Temporarily remove div3 from div2, but append to the same position.
div2.appendChild(div3);
}, {once: true});
events = [];
events.push({type: event.type, target: event.target});
}, {once: true});
await new test_driver.Actions()
.pointerMove(1, 1, {})
.pointerMove(div3Rect.x + 10, div3Rect.y + 10, {})
.send();
const expectedEvents = [
{ type: "mouseover", target: div3 },
{ type: "mouseenter", target: document.body },
{ type: "mouseenter", target: div1 },
{ type: "mouseenter", target: div2 },
{ type: "mouseenter", target: div3 },
{ type: "mousemove", target: div3 },
// Removing the node temporarily should not cause mouse boundary events.
];
assert_equals(
stringifyEvents(events),
stringifyEvents(expectedEvents),
);
div1.remove();
await new test_driver.Actions()
.pointerMove(1, 1, {})
.send();
},
"After re-appending the last over element at mouseenter, " +
"mouse boundary events should not be fired");
}, {once: true});
</script>
</head>
<body style="padding-top: 32px"></body>
</html>