[Feature]: Access correct child `Frame` object from `Locator.content_frame` or `FrameLocator`

[Fly-Playgroud]

🚀 Feature Request

I would like to be able to obtain the correct child frame object from Locator.content_frame or FrameLocator.
Example:

page.locator("#iframeResult").content_frame.frame

it will point the #iframeResult Frame object

Example

Example:

wanted_frame = page.locator("#iframeResult").content_frame.frame
cdp_session = browser_context.new_cdp_session(wanted_frame )

Motivation

Background:
If I want to create a new CDPSession for a sub-frame, in the Python client, it can only be done as follows:

frames = page.frames

wanted_frame = None
for frame in frames:
       # find the wanted frame object
       if frame.xx == nn:
wanted_frame = frame

# or use the following way:
wanted_frame = page.frame(name=xxx, url=xxxx)
cdp_session = browser_context.new_cdp_session(wanted_frame)

However, in most cases, many iframe objects in a page have no attributes at all, such as no name and URL. At this point, I have no way of knowing which frame object is the one I want.

Alternatively, it might have other custom attributes, such as: <iframe custom="xxxx">., but I can't filter the frame object by this custom attr so far!

As shown above, I am unable to accurately initiate a CDP session for the specified frame object

[dgozman]

@Fly-Playgroud You can do something like this:

iframe_locator = page.locator("#iframeResult")
iframe_body = iframe_locator.content_frame.locator("body")
frame = iframe_body.element_handle().owner_frame()

Let me know whether this helps.