Documentation
			REFERENCE
		t.closeWindow method
Closes a browser window. Can be chained with other TestController methods.
t.closeWindow([windowDescriptor]) → this | Promise<any>
| Parameter | Type | Description | 
|---|---|---|
| windowDescriptor (optional) | Object | Object that describes the target window. If this parameter is omitted, the active window is selected. | 
You cannot close the last remaining window or windows with open children.
Examples:
The following two examples produce identical test scenarios:
The window parameter is absent. Each call of the t.closeWindow method closes the active window:
import { Selector } from 'testcafe';
fixture `TestCafe`
    .page('http://www.example.com/');
test('Closing windows', async t => {
    await t.openWindow('https://devexpress.github.io/testcafe');
        .openWindow('https://devexpress.com');
        .closeWindow()
        .closeWindow();
});
The window parameter is present. Each call of the t.closeWindow method closes the specified target window:
import { Selector } from 'testcafe';
fixture `TestCafe`
    .page('http://www.example.com/');
test('Closing specific windows', async t => {
    const testcafe =  await t.openWindow('https://devexpress.github.io/testcafe');
    await t.openWindow('https://devexpress.com');
    const devexpress = await t.getCurrentWindow();
    await t.closeWindow(devexpress)
        .closeWindow(testcafe);
});