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Or is it just mainly a personal preference?
As a programmer I always use underscore, but have seen it as - and so I will have to conform to it working in that project.
I understand hyphens to be more SEO friendly for URLs. This may cary over in some odd case to CSS class and id names, although I can’t think of any particular instance off the top of my head.
Both are valid, I think it just breaks down to personal preference.