Rename existing test to CustomEvent-createEvent.window.js, and add a
version that doesn't depend on document.createEvent() as
CustomEvent.any.js.

Rename the original test to Event-cancelBubble-dom.html and keep only the
parts that depend on bubbling up through DOM elements in that file. Add a
new file, Event-cancelBubble.window.js and move the rest there, to avoid
the HTML boilerplate.

Rename existing test to Event-cancelBubble-createEvent.window.js, and add
a version that doesn't depend on document.createEvent() as
Event-cancelBubble.any.js.

Rename existing test to Event-constants-createEvent.window.js, and add a
version that doesn't depend on document.createEvent() as
Event-constants.any.js.

Also, make sure to expose the export on globalThis in the support script.

…test

Rename existing test to
Event-defaultPrevented-after-dispatch-createEvent.html, and add a version
that doesn't depend on document.createEvent() or DOM elements, as
Event-defaultPrevented-after-dispatch.any.js.

Rename existing test to Event-defaultPrevented-createEvent.window.js, and
add a version that doesn't depend on document.createEvent() as
Event-defaultPrevented.any.js.

Rename the existing test to
Event-init-while-dispatching-dom-events.window.js and keep only the tests
for the window-specific DOM events in that file. Move the tests for Event
and CustomEvent, which are [Exposed=*], to a separate file, named
Event-init-while-dispatching.any.js.

Rename existing test to Event-initEvent-createEvent.window.js, and add a
version that doesn't depend on document.createEvent() as
Event-initEvent.any.js.

Most of this test can be an .any.js test. Keep only the existing test for
what happens when Event.returnValue is set in between document.createEvent
and initEvent, in a separate file named
Event-returnValue-createEvent.window.js.

Rename existing test to Event-stopImmediatePropagation-dom.html, and add a
version that uses an EventTarget object instead of a DOM node as
Event-stopImmediatePropagation.any.js.

Rename the existing test to
Event-subclasses-constructors-dom-events.window.js and keep only the tests
for the window-specific DOM events in that file. Move the tests for the
event subclass, and copy the tests for Event, which is [Exposed=*], to a
separate file, named Event-subclasses-constructors.any.js.

We have to keep the Event tests in the original file as well, for parent
property information.

Rename existing test to Event-type-empty-createEvent.window.js, and add a
version that doesn't depend on document.createEvent() as
Event-type-empty.any.js.

While we're here, add some assertion messages to the original test because
I found them helpful during debugging.

The test using the constructor goes in its own .any.js file. Rename the
remaining tests that depend on document.createEvent to
Event-type-createEvent.window.js.

Rename existing test to EventTarget-this-of-listener-dom.window.js, and
add a version that uses EventTarget instances instead of DOM nodes as
EventTarget-this-of-listener.any.js.

Rename existing test to remove-all-listeners-dom.window.js, and add a
version that uses EventTarget instances instead of DOM nodes as
remove-all-listeners.any.js.

Renames the existing test to Event-propagation-dom-node.window.js, and
adds a copy in Event-propagation-EventTarget.any.js that uses a plain
EventTarget instance instead of a DOM node. The difference is that
EventTarget doesn't have bubbling/capture behaviour, so the expectations
after stopPropagation() and cancelBubble=true are different.

Rename existing test to EventListener-handleEvent-dom-node.window.js, and
add a version that uses EventTarget instances instead of DOM nodes as
EventListener-handleEvent.any.js.

While we're here, fix a typo in the original test.

Rename existing test to EventTarget-dispatchEvent-dom.window.js, and add a
version that uses EventTarget instances instead of DOM nodes and doesn't
test the document.createEvent()-specific stuff, as
EventTarget-dispatchEvent.any.js.