In order to null edit multiple pages, add the page names (not page URLs) each on a new line (including their namespace if necessary) and proceed to null edit them. The script will stop when it reaches an empty line.
If the script is used on Special:WhatLinksHere, it will automatically add the listed pages/files into the text area. Users may also add the contents of categories straight into the text area using the button.
By default, the script will do one page per second. If you'd like to modify that, add the config nullEditDelay before importing the script with your own number (in milliseconds) instead.
The option to use the Mass Null Edit script will appear in your toolbox on the left.
The option to use the Mass Null Edit script will appear under your "My Tools" list (the toolbar at the bottom of your screen).
Please note you must not have the toolbar at the bottom hidden or the script will not function. If you do not see the "My Tools" (or other language equivalent), try clicking Customize and then "reset defaults" to not hide the "My Tools".
Note: In this example, pay close attention to the placement of commas and other punctuation. For people who aren't familiar with programming (and even those who are!), a common mistake when writing code is to accidentally delete, forget, or misplace critical symbols like commas or quotation marks. This can cause a syntax error that breaks the code. Carefully follow the convention shown here when using importArticles.
If you would like another button to access this script while using Special:WhatLinksHere for the autocomplete functionality but are unable to load it from that point, you can add the following config above the import statement to have this as well. It will appear in the user drop-down menu in the top right.