[Webkit-unassigned] [Bug 213139] New: Automation.computeElementLayout should return iframe-relative element rects (when coordinate system is 'Page')

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=213139

            Bug ID: 213139
           Summary: Automation.computeElementLayout should return
                    iframe-relative element rects (when coordinate system
                    is 'Page')
           Product: WebKit
           Version: WebKit Local Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebDriver
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: bburg at apple.com
                CC: bburg at apple.com

Currently it's relative to top-level browsing context, which does not match the non-normative note (https://w3c.github.io/webdriver/#get-element-rect):

"""
The Get Element Rect command returns the dimensions and coordinates of the given web element. The returned value is a dictionary with the following members:

x
X axis position of the top-left corner of the web element relative to the current browsing context’s document element in CSS pixels.
y
Y axis position of the top-left corner of the web element relative to the current browsing context’s document element in CSS pixels.
"""

However the remote end says to "let coordinates be the result of the 'calculate the absolute position' algorithm, which does not seem to align with the note in the case where the main frame is scrolled:

"""
To calculate the absolute position of element:
1. Let rect be the value returned by calling getBoundingClientRect.
2. Let window be the associated window of current top-level browsing context.
3. Let x be (scrollX of window + rect’s x coordinate).
4. Let y be (scrollY of window + rect’s y coordinate).
5. Return a pair of (x, y).
"""

It seems to me that adding the scrollX of the top window is unnecessary to achieve the desired result.

In any case other browsers return iframe-relative coordinates from Get Element Rect.

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