Returning shadowRoot element fails with "cyclic object value" error #1711

juchen33 · 2020-04-15T04:24:12Z

Even if this is not defined in WebDriver Spec, It is working completely fine with Latest Firefox (V67) and Geckodriver (V0.24).

Please find linked screenshot as proof.

@blackgrouse just need to write case as below

IWebElement finalElement = (IWebElement)((IJavaScriptExecutor)_driver).ExecuteScript("return document.querySelector(\"shop-app\").shadowRoot.querySelector(\"shop-home\").shadowRoot.querySelector(\"div.item > shop-button\"));

You will get your element directly without even iterating

Originally posted by @rudreshtrivedi in #1428 (comment)

The text was updated successfully, but these errors were encountered:

juchen33 · 2020-04-15T04:32:41Z

It has been mentioned in the other closed issue that this issue may have been fixed since Firefox 67.
But It was reproduced with Firefox 68.7.0 ESR

Geckodriver v0.26.0
Firefox v68.7.0 ESR
Selenium v3.141
Windows 10

In Java,
WebElement shadow = (WebElement) ((JavascriptExecutor) driver).executeScript("return arguments[0].shadowRoot",element);

org.openqa.selenium.JavascriptException: Cyclic object value
Build info: version: '3.141.59', revision: 'e82be7d358', time: '2018-11-14T08:25:48'
System info: host:os.name: 'Windows Server 2016', os.arch: 'amd64', os.version: '10.0', java.version: '1.8.0_151'
Driver info: org.openqa.selenium.firefox.FirefoxDriver
Capabilities {acceptInsecureCerts: true, browserName: firefox, browserVersion: 68.7.0, javascriptEnabled: true, moz:accessibilityChecks: false, moz:buildID: 20200403171148, moz:geckodriverVersion: 0.26.0, moz:headless: false, moz:processID: 14260, moz:profile: moz:shutdownTimeout: 60000, moz:useNonSpecCompliantPointerOrigin: false, moz:webdriverClick: true, pageLoadStrategy: normal, platform: WINDOWS, platformName: WINDOWS, platformVersion: 10.0, rotatable: false, setWindowRect: true, strictFileInteractability: false, timeouts: {implicit: 0, pageLoad: 300000, script: 30000}, unhandledPromptBehavior: dismiss and notify}

Trace Level Logs

1587018137805 webdriver::server DEBUG -> POST /session/fc2105f3-0b19-4f0c-8715-978cbf9ee5e4/execute/sync {
"script": "return arguments[0].shadowRoot",
"args": [
{
"ELEMENT": "2fe9af88-d3b0-450e-9277-4352a3ff21ff",
"element-6066-11e4-a52e-4f735466cecf": "2fe9af88-d3b0-450e-9277-4352a3ff21ff"
}
]
}
1587018137807 Marionette DEBUG 0 -> [0,713,"WebDriver:ExecuteScript",{"args":[{"ELEMENT":"2fe9af88-d3b0-450e-9277-4352a3ff21ff","element-6066-11e4-a52e-4f735466cecf":"2fe9af88-d3b0-450e-9277-4352a3ff21ff"}],"script":"return arguments[0].shadowRoot"}]
1587018137816 Marionette DEBUG 0 <- [1,713,{"error":"javascript error","message":"Cyclic object value","stacktrace":"WebDriverError@chrome://marionette/content/e ... esponse@chrome://marionette/content/listener.js:700:26\ndispatch/</<@chrome://marionette/content/listener.js:536:19\n"},null]
1587018137815 webdriver::server DEBUG <- 500 Internal Server Error {"value":{"error":"javascript error","message":"Cyclic object value","stacktrace":"WebDriverError@chrome://marionette/content/error.js:175:5\nJavaScriptError@chrome://marionette/content/error.js:354:5\nassert.acyclic@chrome://marionette/content/assert.js:61:11\nevaluate.toJSON@chrome://marionette/content/evaluate.js:301:12\nsendResponse@chrome://marionette/content/listener.js:700:26\ndispatch/</<@chrome://marionette/content/listener.js:536:19\n"}}

whimboo · 2020-04-16T05:40:04Z

Could you please attach a trace-level log from geckodriver? Read more about reporting actionable bugs in our contribution guidelines.

juchen33 · 2020-04-16T06:30:26Z

Thank you for your response. This was my first time reporting issue. I followed the Java example to enable the trace level log. And just updated my post. Could you review it, and let me know if any other information is needed. Thank you again, Julia

…

On Wed, Apr 15, 2020 at 10:40 PM Henrik Skupin ***@***.***> wrote: Could you please attach a trace-level log <https://firefox-source-docs.mozilla.org/testing/geckodriver/TraceLogs.html> from geckodriver? Read more about reporting actionable bugs in our contribution guidelines <https://firefox-source-docs.mozilla.org/testing/geckodriver/Bugs.html>. — You are receiving this because you authored the thread. Reply to this email directly, view it on GitHub <#1711 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/APCT67LWKGSOJR6FU7TO72DRM2K4DANCNFSM4MIIFDIQ> .

juchen33 · 2020-04-16T20:29:11Z

Could you please attach a trace-level log from geckodriver? Read more about reporting actionable bugs in our contribution guidelines.

Trace Level Logs

1587018137805 webdriver::server DEBUG -> POST /session/fc2105f3-0b19-4f0c-8715-978cbf9ee5e4/execute/sync {
"script": "return arguments[0].shadowRoot",
"args": [
{
"ELEMENT": "2fe9af88-d3b0-450e-9277-4352a3ff21ff",
"element-6066-11e4-a52e-4f735466cecf": "2fe9af88-d3b0-450e-9277-4352a3ff21ff"
}
]
}
1587018137807 Marionette DEBUG 0 -> [0,713,"WebDriver:ExecuteScript",{"args":[{"ELEMENT":"2fe9af88-d3b0-450e-9277-4352a3ff21ff","element-6066-11e4-a52e-4f735466cecf":"2fe9af88-d3b0-450e-9277-4352a3ff21ff"}],"script":"return arguments[0].shadowRoot"}]
1587018137816 Marionette DEBUG 0 <- [1,713,{"error":"javascript error","message":"Cyclic object value","stacktrace":"WebDriverError@chrome://marionette/content/e ... esponse@chrome://marionette/content/listener.js:700:26\ndispatch/</<@chrome://marionette/content/listener.js:536:19\n"},null]
1587018137815 webdriver::server DEBUG <- 500 Internal Server Error {"value":{"error":"javascript error","message":"Cyclic object value","stacktrace":"WebDriverError@chrome://marionette/content/error.js:175:5\nJavaScriptError@chrome://marionette/content/error.js:354:5\nassert.acyclic@chrome://marionette/content/assert.js:61:11\nevaluate.toJSON@chrome://marionette/content/evaluate.js:301:12\nsendResponse@chrome://marionette/content/listener.js:700:26\ndispatch/</<@chrome://marionette/content/listener.js:536:19\n"}}

whimboo · 2020-04-17T06:19:30Z

Thanks. Now I noticed that there is already https://bugzilla.mozilla.org/show_bug.cgi?id=1489490 for specifically this problem.

Also the WebDriver spec needs to be updated. See: w3c/webdriver#350

juchen33 · 2020-04-17T06:56:35Z

As I referred the link, included in the my comment. That it has been tested with FF67 by that comment author, the shadowRoot was returned without issue. But I am testing against FF68 ESR, which fails.

…

On Thu, Apr 16, 2020 at 11:19 PM Henrik Skupin ***@***.***> wrote: Thanks. Now I noticed that there is already https://bugzilla.mozilla.org/show_bug.cgi?id=1489490 for specifically this problem. Also the WebDriver spec needs to be updated. See: w3c/webdriver#350 <w3c/webdriver#350> — You are receiving this because you authored the thread. Reply to this email directly, view it on GitHub <#1711 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/APCT67PIK2KT7Y2VATQ7EDTRM7YH7ANCNFSM4MIIFDIQ> .

whimboo · 2020-08-13T08:27:48Z

Everyone please stop posting "me too" comments on this issue. As you can notice by #1711 (comment) we are aware of this problem, which hasn't been fixed yet. Thanks.

CAVAh · 2020-09-09T14:14:31Z

Using return arguments[0].shadowRoot.children instead return arguments[0].shadowRoot on executeScript() works for me. Doesn't throw an error, will result a list of FirefoxWebElement, but you can select one of the list (in my case the last one). Not a fix, but as a work around..

whimboo · 2022-07-13T09:59:03Z

Please note that there is no need anymore to use script execution for retrieving the shadow root element given that all the recent Selenium bindings should actually support the Get Element Shadow Root command command and Firefox since version 96 and geckodriver 0.31.0.

I'll still try to get the failure for execute script in https://bugzilla.mozilla.org/show_bug.cgi?id=1764594.

paulmillar · 2022-09-14T10:31:21Z

@whimboo, at least for the remote driver, the shadow_root property contains an explicit check that rejects Firefox.

As far as I can see, something like:

shadow_root = driver.execute_script('return arguments[0].shadowRoot', shadow_host)

is the only way that works for all versions of Chrome.

The same approach should also work for Firefox, except for this issue.

fenchu · 2023-04-26T14:12:34Z

This is mostly fixed with geckodriver 0.33.0 and FF113.

instead of the script execution you can use the shadow_root:
(this refers to everything under :shadow_root in the dom)

el = WebDriverWait(wd, 10).until(EC.presence_of_element_located((By.XPATH, "//*[@id='select-type-dispensation']")))
el = el.shadow_root.find_element(By.CSS_SELECTOR, "select.bp-select")
el.click()

you cant use XPATH in shadow_root, and there are some small bugs left.

whimboo · 2023-04-26T15:15:23Z

Oh right, I should have closed this issue as fixed.

Regarding the XPATH issue this is https://bugzilla.mozilla.org/show_bug.cgi?id=1822311 and there needs to be a discussion in the WG group how we want to handle the unsupported strategy - most likely to raise a specific error.

juchen33 changed the title ~~Even if this is not defined in WebDriver Spec, It is working completely fine with Latest Firefox (V67) and Geckodriver (V0.24).~~ Open shadow root DOM failed with Cyclic object value Error in Firefox 68.7.0 ESR Apr 15, 2020

whimboo added the awaiting reporter feedback label Apr 16, 2020

whimboo added marionette specification and removed awaiting reporter feedback labels Apr 17, 2020

whimboo changed the title ~~Open shadow root DOM failed with Cyclic object value Error in Firefox 68.7.0 ESR~~ Returning shadowRoot element fails with "cyclic object value" error Apr 17, 2020

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whimboo mentioned this issue Jul 13, 2022

executing pseudoelement javascript -> selenium.common.exceptions.JavascriptException: Message: Cyclic object value #1859

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whimboo closed this as completed Apr 26, 2023

DoctorDalek1963 mentioned this issue Sep 20, 2023

#shadow-root doesn't work on Firefox with geckodriver Vrtgs/thirtyfour#180

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Returning shadowRoot element fails with "cyclic object value" error #1711

Returning shadowRoot element fails with "cyclic object value" error #1711

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Returning shadowRoot element fails with "cyclic object value" error #1711

Returning shadowRoot element fails with "cyclic object value" error #1711

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