CSS Opacity 0 vs 0.0001
css
Solution
If you set opacity to 0, it disappears from the page. But if you set opacity to 0.0001, it's still on the page (just "very hard to see") and it keep it's functionality (e.g. click etc).
Problem
I noticed on github that they use opacity of 0.0001, rather than 0, on certain elements they want to make transparent. Why is that?