webdriver.execute_script("window") returns nothing

[annk...@gmail.com]

## Meta -
OS:
<!-- Ubuntu 16.04 x64 -->
Selenium Version:
<!-- 3.13 -->
Browser:
<!-- Chrome -->

(Session info: chrome=69.0.3497.92)
(Driver info: chromedriver=2.42.591071 (0b695ff80972cc1a65a5cd643186d2ae582cd4ac),platform=Linux 4.10.0-42-generic x86_64)

Python code to reproduce:
```
from selenium import webdriver
driver = webdriver.Chrome()
driver.get("https://www.google.com")
driver.execute_script("return window")
```
Response:
```
>>> driver.execute_script("return window")
DEBUG - POST http://127.0.0.1:42663/session/7604aae6d0535b100dd0674dce61cc6c/execute {"sessionId": "7604aae6d0535b100dd0674dce61cc6c", "args": [], "script": "return window"}
DEBUG - {"sessionId":"7604aae6d0535b100dd0674dce61cc6c","status":0,"value":[]}
DEBUG - Finished Request
[]
```

**Webdriver.execute_script doesn't want return a window object** from browser-under-test. I receive a NULL instead of dictionary of data.

At the same time 'screen' and 'document' returned as expected
>>> driver.execute_script("return screen")
DEBUG - {"sessionId":"7604aae6d0535b100dd0674dce61cc6c","status":0,"value":{"availHeight":1026,"availLeft":49,"availTop":24,"availWidth":1631,"colorDepth":24,"height":1050,"orientation":{"addEventListener":{},"angle":0,"dispatchEvent":{},"lock":{},"onchange":null,"removeEventListener":{},"type":"landscape-primary","unlock":{}},"pixelDepth":24,"width":1680}}

>>> driver.execute_script("return document")
DEBUG - {"sessionId":"7604aae6d0535b100dd0674dce61cc6c","status":0,"value":{"ELEMENT":"0.2432158247155225-1"}}

For Firefox this issue isn't applicable

[Caleb Rouleau]

HI, is this a new regression in a recent version? i.e. did this at one point work in Chrome and now it doesn't?

Also, why are you needing the information from the window object anyway? It may help to better understand your use case.

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Caleb Rouleau

Chrome and Widevine EngProd

[annk...@gmail.com]

пятница, 14 сентября 2018 г., 20:18:01 UTC+3 пользователь Caleb Rouleau написал:

It's a new feature for me, so I can't you the webdriver version where it worked.

I'd like access to localStorage and sessionStorage using window object.
I need to do something like this
execute_script("window.sessionStorage.getItem('abc')") to read and write data to sessionStorage

[John Chen]

ChromeDriver is only designed to return simple objects from Chrome to the app. Strings, numbers, and web elements are fine, plus arrays and objects containing those types. Anything beyond that and you'll likely run into problems. You can certainly do execute_script("return window.sessionStorage.getItem('abc')"), but you can't get the whole window object. It's way too complicated.

[annk...@gmail.com]

I understood =)

I checked the case when I ask ChromeDriver to return a string/int (not object) it returns it well.

Thank you for your comments