[Bug] iframe[loading]' is wrongly reported as not supported by Firefox, Firefox for Android, Safari, Safari on iOS

[Christian Oliff]

🐞 Bug report

Description

iframe[loading] is wrongly reported as not supported by Firefox, Firefox for Android, Safari, Safari on iOS

Details

I used the Webhint browser extension.

Reference for browser support: https://developer.mozilla.org/en-US/docs/Web/HTML/Element/iframe#browser_compatibility