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"TypeError: Assignment to constant variable" when testing some URLs #321
Description
Steps to reproduce
- install the bookmarklet
- visit one of the following URLs:
- click the bookmarklet
Expected result
The sniffer should run and report any issues
Actual result
The test does not complete
Errors in console:
Uncaught TypeError: Assignment to constant variable.
at Object.testNullAltText (HTMLCS.js:24:223570)
at Object.addNullAltTextResults (HTMLCS.js:24:222007)
at Object.process (HTMLCS.js:24:221802)
at m (HTMLCS.js:24:288483)
at c (HTMLCS.js:24:288090)
at Object.run (HTMLCS.js:24:287448)
at HTMLCS.js:24:286284
at HTMLCS.js:24:286545
at h (HTMLCS.js:24:289153)
at HTMLCS.js:24:289131
Originally raised as pa11y/pa11y#709
Activity
malcomio commentedon Dec 19, 2024
Using a debug version, the output is as follows:
declar var elements - fixes squizlabs#321
Fix for squizlabs#321
GRASPARK commentedon Nov 17, 2025
@malcomio
I have checked both links and confirmed the following:
It appears that the issue with the second link is related to the presence of a Content Security Policy (CSP), which is preventing the code-sniffing method from functioning correctly.
For your reference, CSP is enabled on the second link but not on the first.
If you need any more details than please share me screenshot to help you with.
malcomio commentedon Nov 17, 2025
thanks @GRASPARK that makes sense - the problem seems to be addressed by the changes in #322