Encountering the error message "org.openqa.selenium.JavascriptException: javascript error: eval is disabled" when attempting to conduct accessibility testing with Axe-Core

My current project involves conducting accessibility testing using the Axe-Core tool with Java as the programming language. While I have successfully obtained results from many pages in my application, I encountered an error on one specific page:

 org.openqa.selenium.JavascriptException: javascript error: eval is disabled
(Session info: chrome=81.0.4044.138)
Build info: version: '3.141.59', revision: 'e82be7d358', time: '2018-11-14T08:17:03'
System info: host: 'XXXX', ip: 'XXXX', os.name: 'Windows 10', os.arch: 'amd64', 
os.version: '10.0', java.version: '1.8.0_131'
Driver info: org.openqa.selenium.chrome.ChromeDriver
Capabilities {acceptInsecureCerts: false, browserName: chrome, browserVersion: 81.0.4044.138, chrome: 
{chromedriverVersion: 81.0.4044.138 (8c6c7ba89cc9..., userDataDir: C:\Users\NASEEM~1.AHM\AppDa...}, 
goog:chromeOptions: {debuggerAddress: localhost:52030}, javascriptEnabled: true, 
networkConnectionEnabled: false, pageLoadStrategy: normal, platform: WINDOWS, platformName: WINDOWS, 
proxy: Proxy(), setWindowRect: true, strictFileInteractability: false, timeouts: {implicit: 0, 
pageLoad: 300000, script: 30000}, unhandledPromptBehavior: dismiss and notify, webauthn:virtualAuthenticators: true}
Session ID: cbdfe9de190b8224da1ec675bef90966

The error occurs within the following code snippet:

 JSONObject responseJSON = new AXE.Builder(driver, scriptUrl).analyze();

This issue specifically arises when running the test in the Chrome browser. Surprisingly, when executing the same code in Firefox, it runs smoothly without any hiccups.

Is there anything else that I should consider adding while running the test? Are there any desired capabilities that I need to include?

Your suggestions would be highly appreciated.

javascriptselenium-webdriveraccessibility

Answer №1

It seems likely that the error you are encountering is due to a content security policy implemented on the website you are testing.

A Content Security Policy (CSP) is put in place by website owners to protect users from any malicious third-party scripts, CSS or images being injected into their site. Any content not explicitly allowed in the CSP will be blocked.

One of the restrictions within a CSP is blocking the use of JavaScript's eval function, which appears to be necessary for your program.

To resolve this issue, the site owner would need to specifically permit the use of eval on their site by adding unsafe-eval as a rule in their CSP configuration.

As stated on the linked page about CSP:

'unsafe-eval'

Allows the use of eval() and similar methods for creating code from strings. Single quotes must be included.

If you suspect the CSP is causing the problem, you can test it on another strict CSP site like mine at .

Update after discussions

Although I correctly identified the issue, the actual cause was different than initially thought.

The website was preventing the use of window.eval, effectively disabling it. This behavior can be seen in a simple example demonstrated in the provided fiddle.

Your options for addressing this include rewritting Axe-Core to avoid the use of eval, as it may inject this into the Window object being tested.

If others face the same problem, one potential solution could involve replacing the problematic script with a version that overrides 

window.eval</code to allow the script to run. However, if they are also using a CSP that blocks <code>window.eval
, injecting such a script may not be feasible.

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