If you ever use a form that requires you to select/de-select a number of checkboxes, and the programmer hasn’t included a “Select-All” button on the page, then you might want to create a browser bookmark that will do the job.
I’m not sure how to create a Bookmark or Favorite from scratch, so I just go to any web page and click on “Add to Favorites…” or “Bookmark This Page.” After the item is created, I right-click on it and go to Properties. I change the name of the bookmark to something like, “Checkbox Select-All” and then I replace the existing URL or Location field with the coding shown below.
Here is the code:>>==>
Then when you go to a form that requires you to check all the boxes, just click on the bookmark and the boxes will be selected. Again, and they will be un-selected.