What’s an interactive element? by Manuel Matuzovic
Manuel sensed a general misunderstanding of what an interactive element is and what focusable really means. He wasn’t totally sure himself either, so did some research. It’s a long post but here’s the conclusion:
Long story short: interactive elements are focusable, but focusable doesn't necessarily mean tabbable because there are also click-focusable elements, which aren't tabbable but can be focused programmatically or via click.
Also, it's perfectly acceptable to place tabindex on a non-interactive element when it helps with accessibility.
Interestingly, he was motivated to do this research after feeling confused when reading some guidance on MDN’s Dialog element docs.
