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Test Info:
- This WPT test may be referenced by the following Test IDs:
- /css/css-transitions/disconnected-element-001.html - WPT Dashboard Interop Dashboard
<!doctype html>
<html>
<head>
<meta charset=utf-8>
<title>CSS Transitions Test: Transitions do not run for a disconnected element</title>
<meta name="assert" content="If an element is not in the document during that
style change event or was not in the document during the previous style change
event, then transitions are not started for that element in that style change
event.">
<meta name="assert" content="If an element is no longer in the document,
implementations must cancel any running transitions on it and remove transitions
on it from the completed transitions.">
<link rel="help" title="Starting transitions"
<script src="/resources/testharness.js" type="text/javascript"></script>
<script src="/resources/testharnessreport.js" type="text/javascript"></script>
<script src="./support/helper.js" type="text/javascript"></script>
</head>
<body>
<div id="log"></div>
<script>
promise_test(async t => {
// Create element and remove it from the document
const div = addDiv(t, {
style: 'transition: background-color 100s; background-color: red',
});
div.remove();
// Attach event listeners
div.addEventListener('transitionrun', t.step_func(() => {
assert_unreached('transitionrun event should not be fired');
}));
// Resolve before-change style
getComputedStyle(div).backgroundColor;
// Set up and resolve after-change style
div.style.backgroundColor = 'green';
getComputedStyle(div).backgroundColor;
// There should be no events received for the triggered transition.
await waitForFrame();
await waitForFrame();
}, 'Transitions do not run on an element not in the document');
test(t => {
// Create element but do not attach it to the document
const div = addDiv(t, {
style: 'transition: background-color 100s; background-color: red',
});
div.remove();
// Resolve before-change style
getComputedStyle(div).backgroundColor;
// Add to document
document.documentElement.append(div);
// Set up and resolve after-change style
div.style.backgroundColor = 'green';
getComputedStyle(div).backgroundColor;
// We should have jumped immediately to the after-change style rather than
// transitioning to it.
assert_equals(
getComputedStyle(div).backgroundColor,
'rgb(0, 128, 0)',
'No transition should run'
);
}, 'Transitions do not run for an element newly added to the document');
promise_test(async t => {
// Create element and attach it to the document
const div = addDiv(t, {
style: 'transition: background-color 100s; background-color: red',
});
// Attach event listeners
div.addEventListener('transitionrun', t.step_func(() => {
assert_unreached('transitionrun event should not be fired');
}));
// Resolve before-change style
getComputedStyle(div).backgroundColor;
// Set up after-change style
div.style.backgroundColor = 'green';
// But remove the document before the next style change event
div.remove();
// There should be no events received for the triggered transition.
await waitForFrame();
await waitForFrame();
}, 'Transitions do not run for an element newly removed from the document');
promise_test(async t => {
// Create element and attach it to the document
const div = addDiv(t, {
style: 'transition: background-color 100s; background-color: red',
});
// Attach event listeners
const eventWatcher = new EventWatcher(t, div, [
'transitionrun',
'transitioncancel',
]);
// Trigger transition
getComputedStyle(div).backgroundColor;
div.style.backgroundColor = 'green';
getComputedStyle(div).backgroundColor;
await eventWatcher.wait_for('transitionrun');
// Remove the element from the document
div.remove();
await eventWatcher.wait_for('transitioncancel');
}, 'Transitions are canceled when an element is removed from the document');
promise_test(async t => {
// Create a container element. We'll need this later.
const container = addDiv(t);
// Create element and attach it to the document
const div = addDiv(t, {
style: 'transition: background-color 100s; background-color: red',
});
// Attach event listeners
const eventWatcher = new EventWatcher(t, div, [
'transitionrun',
'transitioncancel',
]);
// Trigger transition
getComputedStyle(div).backgroundColor;
div.style.backgroundColor = 'green';
getComputedStyle(div).backgroundColor;
await eventWatcher.wait_for('transitionrun');
// Re-parent element
container.append(div);
await eventWatcher.wait_for('transitioncancel');
assert_equals(
getComputedStyle(div).backgroundColor,
'rgb(0, 128, 0)',
'There should be no transition after re-parenting'
);
}, 'Transitions are canceled when an element is re-parented');
promise_test(async t => {
// Create element and attach it to the document
const div = addDiv(t, {
style: 'transition: background-color 100s; background-color: red',
});
// Attach event listeners
const eventWatcher = new EventWatcher(t, div, [
'transitionrun',
'transitioncancel',
]);
// Trigger transition
getComputedStyle(div).backgroundColor;
div.style.backgroundColor = 'green';
getComputedStyle(div).backgroundColor;
await eventWatcher.wait_for('transitionrun');
// Re-parent element to same parent
document.documentElement.append(div);
await eventWatcher.wait_for('transitioncancel');
assert_equals(
getComputedStyle(div).backgroundColor,
'rgb(0, 128, 0)',
'There should be no transition after re-parenting'
);
}, 'Transitions are canceled when an element is re-parented to the same node');
</script>
</body>
</html>