tschaub/openlayers — comment on commit 87f8d09d94612a804d4e953402b8201ba517af8c
File:  line 0
By elemoine:

If we do that people who do want to have rounded corners in old browsers (by setting roundedCorner to true) will need to add css to set border-radius to 0, or the layer switcher will look ugly in modern browsers. We could also detect if border-radius is supported, and, if it's supported, ignore the roundedCorner option. I'll look at it when I get a chance.