Opacity displays inaccurate style

I noticed the Opacity feature has a bug. By default opacity 100% should display the full color, but unfortunately WF makes 100% opacity of div element 0%. However, making it 99% shows full color. Is this intended?

Wait what? Do you have an example of this?

I actually experienced this, even after refreshing the browser it was like that. Will let you know if it comes up again.