Did you find a bug?

do not open up an issue if the bug concerns legacy browser support, i.e. <= IE9, <= iOS 7 etc. unless you have a simple solution
make sure the bug was not already reported
if you open an issue, include a title, description and as much relevant information as possible

Did you write a patch that fixes the bug?

open a new pull request with the patch and a short description

Do you require a new feature or you want a change in an existing one?

open a new issie with a detailed description of the feature