Axe-core recently tried to implement the passed example 4 for Element with aria-hidden has no focusable content. I was hoping for some clarity around the example, namely if you might have any real-world scenarios around the onfocus attribute.

Currently we don't have a way to determine what the onfocus attribute does on an element, so are left with just not failing any element with the attribute. This seems a bit too broad of a stroke though so were hoping to gather some more real-world examples of the onfocus attribute. I tried to find some real-world examples, but was unsuccessful (all I found were mostly just tutorials and explanations about the attribute).