Wrong events coordinates in iFrames

[sadym-chromium]

In input.performActions command, with origin: "viewport" and context of iframe, the wrong coordinates are used.

• The WebDriver specification get coordinates relative to an origin requires the coordinates to be used are relative to the provided context's viewport.
• The Mapper uses CDP method Input.dispatchMouseEvent, which uses coordinated "relative to the main frame's viewport".

Repro: test_move_to_origin_position_within_frame.

[sadym-chromium]

We can try to traverse up the frame tree and try to get the frame offset. This approach wouldn't work for shadow tree though

[whimboo]

But the Shadow DOM doesn't have its own viewport. It's sharing it with the viewport of the main document. Or am I wrong? But it could happen that there is an iframe within the Shadow DOM which indeed would have to be taken into account. I don't think that we have a test case for that yet.

[martinpitt]

This sounds similar to what I reported half a year ago in https://issues.chromium.org/issues/359616812 . Probably that bug report should live in this project rather.

I have a small standalone reproducer for this bug:

git clone https://github.com/martinpitt/bidi-test
cd bidi-test
python3 -m http.server
./bidimouse.py

The https://github.com/martinpitt/bidi-test has details about this bug and how to run it.