Can we Zoom the browser window in python selenium webdriver?

Question

I am trying to ZOOM IN and ZOOM OUT the Chrome( selenium webdriver) only using keyboard. I have tried --

from selenium.webdriver.common.keys import Keys
driv         


        

Answer 1

Environment:

• Selenium 3.6.0
• chromedriver 2.33
• Chrome version 62.0.3202.75 (Official Build) (64-bit)
• macOS Sierra 10.12.6

I tried the ways (without use the CSS) that people suggested in other questions in the past. For example, the answers in this question: Selenium webdriver zoom in/out page content.

Or this: Test zoom levels of page on browsers

without success.

So, I thought: if not with the shortcuts, what could be a different way to do that?

The idea is to use the "chrome://settings/" page in order to change the zoom:

Ok I know, for example from Going through Chrome://settings by Selenium, that every settings should be setted in the ChromeOptions.

From this question I noticed that in the list of preferences the only paramater (I think) could be:

// Double that indicates the default zoom level.
const char kPartitionDefaultZoomLevel[] = "partition.default_zoom_level";

I tried, without success.

I want to repeat that I know isn't the correct approach (and that will be different with different browser versions), but it works and, at least, was useful for me to understand how to go inside a shadow root element with selenium.

The following method return the elements inside a shadow root:

def expand_shadow_element(element):
    shadow_root = driver.execute_script('return arguments[0].shadowRoot', element)
    return shadow_root

Is useful because in the chrome://settings/ page there are shadow root elements.

In order to do that, in my browser this is the path:

root1=driver.find_element_by_xpath("*//settings-ui")
shadow_root1 = expand_shadow_element(root1)
container= shadow_root1.find_element_by_id("container")

root2= container.find_element_by_css_selector("settings-main")
shadow_root2 = expand_shadow_element(root2)

root3=shadow_root2.find_element_by_css_selector("settings-basic-page")

shadow_root3 = expand_shadow_element(root3)
basic_page = shadow_root3.find_element_by_id("basicPage")

settings_section= basic_page.find_element_by_xpath(".//settings-section[@section='appearance']")

root4= settings_section.find_element_by_css_selector("settings-appearance-page")
shadow_root4=expand_shadow_element(root4)

and finally:

settings_animated_pages= shadow_root4.find_element_by_id("pages")
neon_animatable=settings_animated_pages.find_element_by_css_selector("neon-animatable")

zoomLevel= neon_animatable.find_element_by_xpath(".//select[@id='zoomLevel']/option[@value='0.5']")
zoomLevel.click()

The entire code:

driver = webdriver.Chrome(executable_path=r'/pathTo/chromedriver')

def expand_shadow_element(element):
    shadow_root = driver.execute_script('return arguments[0].shadowRoot', element)
    return shadow_root


driver.get('chrome://settings/')

root1=driver.find_element_by_xpath("*//settings-ui")
shadow_root1 = expand_shadow_element(root1)
container= shadow_root1.find_element_by_id("container")

root2= container.find_element_by_css_selector("settings-main")
shadow_root2 = expand_shadow_element(root2)

root3=shadow_root2.find_element_by_css_selector("settings-basic-page")

shadow_root3 = expand_shadow_element(root3)
basic_page = shadow_root3.find_element_by_id("basicPage")

settings_section= basic_page.find_element_by_xpath(".//settings-section[@section='appearance']")

root4= settings_section.find_element_by_css_selector("settings-appearance-page")
shadow_root4=expand_shadow_element(root4)

settings_animated_pages= shadow_root4.find_element_by_id("pages")
neon_animatable=settings_animated_pages.find_element_by_css_selector("neon-animatable")

zoomLevel= neon_animatable.find_element_by_xpath(".//select[@id='zoomLevel']/option[@value='0.5']")
zoomLevel.click()


driver.get("https://www.google.co.uk/")

EDIT

As suggested by @Florent B in the comments, we can obtain the same result simple with:

driver.get('chrome://settings/')
driver.execute_script('chrome.settingsPrivate.setDefaultZoom(1.5);')
driver.get("https://www.google.co.uk/")