Silently fails on some sites

[waldyrious]

E.g. https://continente.pt. This is different from #28, since there's no error log in the console. I believe I used to be able to run the script on the site in the past, but can't be sure.

[waldyrious]

It seems that the issue is that there's an <input type=password> in the DOM, although it's not visible in the page.

To fix this, according to this SO answer, we would need to use something like:

pwd=document.querySelector("input[type='password']")
pwd.offsetParent === null

Note: window.getComputedStyle(pwd) could work in some cases, but in the case of continente.pt, the display property is set to "block", and visibility is set to "visible".

[waldyrious]

Hm, turns out I'm getting false positives with the offsetParent method. Perhaps an IntersectionObserver or checkVisibility() will be needed to make this work reliably.