Use rgba() to better visually support overlapping annotations

[taitems]

We've built a similar annotation tool for PDF.js and one of the things we would recommend is using rbga colour values. That way you can see when they overlap easier.

[bharani91]

I've added a slight alpha for the background colours. One of the things that I was thinking was that instead of having a background color, I could show a thick underline like this (from wired.com) -

What do you think?

[taitems]

That's an interesting way around it. We were matching web annotations to more native iOS and Android annotation styles so we never considered any other visuals. I think whole word height highlights are probably more familiar to people, but you're never going to break new ground that way ;)