[anoncake]

Does it? I don't think you can reliably identify whether something is visible if the other site, which controls the CSS, does not want you to. It's a classical arms race situation.

[plausibilities]

https://webdriver.io/docs/api/element/isDisplayed.html

[anoncake]

    <span style="opacity: 0.001">Trap!</span>

[thecatspaw]

Selenium can reliably do that, as it is a proper webbrowser controlled through an API

[anoncake]

Yes, but it is not a human eye and brain.