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"TypeError: Assignment to constant variable" when testing some URLs #321

Description

@malcomio

Steps to reproduce

  1. install the bookmarklet
  2. visit one of the following URLs:
    1. https://www.transizionedigitale.it/
    2. https://www.neso.energy/
  3. 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

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