A quick note about Manuel Matuzović's discovery of Safari not being able to focus zero-size elements.
Topic: Accessibility
It's common practice to sometimes overwrite an element's visual label with
aria-label
to provide more accessible information. As it turns out, this could break speech recognition software.em and strong elements are not announced by assistive technologies such as screen readers.
The table cell attribute "headers" allows you to associate multiple header cells which is useful for tables with rows or columns spanning multiple cells.
Enforce pinch-to-zoom for sites that disable it on Chrome/Firefox on Android.