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collapsible2
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‎docs/src/app/(private)/experiments/collapsible2/transitions.module.css

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.Root {
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--width: 320px;
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--duration: 800ms;
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width: var(--width);
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& + .Root {
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margin-top: 2rem;
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}
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}
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.Panel {
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display: grid;
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box-sizing: border-box;
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width: 100%;
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grid-template-rows: 1fr;
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transition: all var(--duration);
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&[data-starting-style],
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&[data-ending-style] {
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opacity: 0;
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grid-template-rows: 0fr;
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}
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}
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.Content {
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display: flex;
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flex-direction: column;
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gap: 0.5rem;
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margin-top: 0.25rem;
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padding: 0.5rem;
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border-radius: 0.25rem;
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background-color: var(--color-gray-200);
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cursor: text;
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& p {
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overflow-wrap: break-word;
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}
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}
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.Trigger {
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display: flex;
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width: 100%;
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align-items: center;
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padding: 0.25rem 0.5rem;
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border-radius: 0.25rem;
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background-color: var(--color-gray-200);
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color: var(--color-gray-900);
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&[data-panel-open] .Icon {
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transform: rotate(90deg);
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}
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}
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.Icon {
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width: 0.75rem;
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height: 0.75rem;
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transition: transform var(--duration) ease-out;
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}
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.grid {
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display: grid;
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grid-template-columns: 1fr 1fr;
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grid-gap: 5rem;
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}
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.wrapper {
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font-family: system-ui, sans-serif;
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line-height: 1.4;
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display: flex;
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flex-flow: column nowrap;
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align-items: stretch;
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gap: 1rem;
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align-self: flex-start;
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}

‎docs/src/app/(private)/experiments/collapsible2/transitions.tsx

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'use client';
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import * as React from 'react';
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import { Collapsible } from '@base-ui-components/react/collapsible2';
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import { ChevronIcon } from '../collapsible/_icons';
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import styles from './transitions.module.css';
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export default function CssTransitions() {
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return (
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<div className={styles.grid}>
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<div className={styles.wrapper}>
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<pre>keepMounted: true</pre>
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<Collapsible.Root className={styles.Root} defaultOpen>
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<Collapsible.Trigger className={styles.Trigger}>
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<ChevronIcon className={styles.Icon} />
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Trigger
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</Collapsible.Trigger>
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<Collapsible.Panel className={styles.Panel} keepMounted>
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<div className={styles.Content}>
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<p>
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He rubbed his eyes, and came close to the picture, and examined it
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again. There were no signs of any change when he looked into the
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actual painting, and yet there was no doubt that the whole expression
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had altered. It was not a mere fancy of his own. The thing was
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horribly apparent.
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</p>
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</div>
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</Collapsible.Panel>
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</Collapsible.Root>
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<Collapsible.Root className={styles.Root} defaultOpen={false}>
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<Collapsible.Trigger className={styles.Trigger}>
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<ChevronIcon className={styles.Icon} />
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Trigger
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</Collapsible.Trigger>
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<Collapsible.Panel className={styles.Panel} keepMounted>
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<div className={styles.Content}>
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<p>
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He rubbed his eyes, and came close to the picture, and examined it
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again. There were no signs of any change when he looked into the
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actual painting, and yet there was no doubt that the whole expression
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had altered. It was not a mere fancy of his own. The thing was
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horribly apparent.
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</p>
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</div>
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</Collapsible.Panel>
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</Collapsible.Root>
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<small>———</small>
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</div>
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<div className={styles.wrapper}>
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<pre>keepMounted: false</pre>
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<Collapsible.Root className={styles.Root} defaultOpen>
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<Collapsible.Trigger className={styles.Trigger}>
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<ChevronIcon className={styles.Icon} />
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Trigger
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</Collapsible.Trigger>
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<Collapsible.Panel className={styles.Panel} keepMounted={false}>
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<div className={styles.Content}>
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<p>
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He rubbed his eyes, and came close to the picture, and examined it
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again. There were no signs of any change when he looked into the
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actual painting, and yet there was no doubt that the whole expression
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had altered. It was not a mere fancy of his own. The thing was
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horribly apparent.
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</p>
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</div>
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</Collapsible.Panel>
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</Collapsible.Root>
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<Collapsible.Root className={styles.Root} defaultOpen={false}>
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<Collapsible.Trigger className={styles.Trigger}>
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<ChevronIcon className={styles.Icon} />
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Trigger
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</Collapsible.Trigger>
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<Collapsible.Panel className={styles.Panel} keepMounted={false}>
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<div className={styles.Content}>
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<p>
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He rubbed his eyes, and came close to the picture, and examined it
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again. There were no signs of any change when he looked into the
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actual painting, and yet there was no doubt that the whole expression
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had altered. It was not a mere fancy of his own. The thing was
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horribly apparent.
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</p>
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</div>
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</Collapsible.Panel>
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</Collapsible.Root>
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<small>———</small>
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</div>
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</div>
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);
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}

‎packages/react/package.json

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"./checkbox": "./src/checkbox/index.ts",
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"./checkbox-group": "./src/checkbox-group/index.ts",
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"./collapsible": "./src/collapsible/index.ts",
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"./collapsible2": "./src/collapsible2/index.ts",
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"./dialog": "./src/dialog/index.ts",
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"./direction-provider": "./src/direction-provider/index.ts",
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"./field": "./src/field/index.ts",

‎packages/react/src/collapsible2/index.parts.ts

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export { CollapsibleRoot as Root } from './root/CollapsibleRoot';
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export { CollapsibleTrigger as Trigger } from './trigger/CollapsibleTrigger';
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export { CollapsiblePanel as Panel } from './panel/CollapsiblePanel';

‎packages/react/src/collapsible2/index.ts

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export * as Collapsible from './index.parts';

‎packages/react/src/collapsible2/panel/CollapsiblePanel.test.tsx

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import * as React from 'react';
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import { expect } from 'chai';
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import { spy } from 'sinon';
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import { act, fireEvent, flushMicrotasks } from '@mui/internal-test-utils';
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import { Collapsible } from '@base-ui-components/react/collapsible';
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import { createRenderer, describeConformance, isJSDOM } from '#test-utils';
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const PANEL_CONTENT = 'This is panel content';
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describe('<Collapsible.Panel />', () => {
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const { render } = createRenderer();
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describeConformance(<Collapsible.Panel />, () => ({
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refInstanceof: window.HTMLDivElement,
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render: (node) => {
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return render(<Collapsible.Root defaultOpen>{node}</Collapsible.Root>);
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},
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}));
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describe('prop: keepMounted', () => {
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it('does not unmount the panel when true', async () => {
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function App() {
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const [open, setOpen] = React.useState(false);
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return (
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<Collapsible.Root open={open} onOpenChange={setOpen}>
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<Collapsible.Trigger />
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<Collapsible.Panel keepMounted>{PANEL_CONTENT}</Collapsible.Panel>
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</Collapsible.Root>
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);
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}
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const { queryByText, getByRole } = await render(<App />);
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const trigger = getByRole('button');
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expect(trigger).to.have.attribute('aria-expanded', 'false');
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expect(trigger.getAttribute('aria-controls')).to.equal(
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queryByText(PANEL_CONTENT)?.getAttribute('id'),
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);
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expect(queryByText(PANEL_CONTENT)).to.not.equal(null);
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expect(queryByText(PANEL_CONTENT)).not.toBeVisible();
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expect(queryByText(PANEL_CONTENT)).to.have.attribute('data-closed');
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fireEvent.click(trigger);
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await flushMicrotasks();
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expect(trigger).to.have.attribute('aria-expanded', 'true');
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expect(queryByText(PANEL_CONTENT)).toBeVisible();
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expect(queryByText(PANEL_CONTENT)).to.have.attribute('data-open');
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expect(trigger).to.have.attribute('data-panel-open');
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fireEvent.click(trigger);
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await flushMicrotasks();
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expect(trigger).to.have.attribute('aria-expanded', 'false');
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expect(trigger.getAttribute('aria-controls')).to.equal(
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queryByText(PANEL_CONTENT)?.getAttribute('id'),
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);
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expect(queryByText(PANEL_CONTENT)).not.toBeVisible();
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expect(queryByText(PANEL_CONTENT)).to.have.attribute('data-closed');
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});
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});
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// we test firefox in browserstack which does not support this yet
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describe.skipIf(!('onbeforematch' in window) || isJSDOM)('prop: hiddenUntilFound', () => {
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it('uses `hidden="until-found" to hide panel when true', async () => {
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const handleOpenChange = spy();
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const { queryByText } = await render(
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<Collapsible.Root defaultOpen={false} onOpenChange={handleOpenChange}>
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<Collapsible.Trigger />
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<Collapsible.Panel hiddenUntilFound keepMounted>
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{PANEL_CONTENT}
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</Collapsible.Panel>
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</Collapsible.Root>,
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);
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const panel = queryByText(PANEL_CONTENT);
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act(() => {
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const event = new window.Event('beforematch', {
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bubbles: true,
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cancelable: false,
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});
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panel?.dispatchEvent(event);
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});
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expect(handleOpenChange.callCount).to.equal(1);
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expect(panel).to.have.attribute('data-open');
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});
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});
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});

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