Being an editor as well as a writer is likely to open more doors for you in online media than it would in print media. Therefore, it's best to write succinctly, break content up into manageable chunks, use intuitive headlines and section headings, begin with some kind of brief summary, use bulleted lists, etc. This doesn't necessarily mean that you should provide less information or detail than you would in print. In fact, you might want to offer much more. Just take extra care when organizing your online material, and write as clearly as possible.
Hyperlinks also can affect online writing style.
Basically, online writers should look for linking opportunities that make sense, but avoid overloading your readers with links. From the reader's perspective every link represents an option, but it also represents yet another decision to make. Ideally, your online writing should offer some value regardless of whether people follow your links. Be willing to structure your sentences specifically to provide excellent link text. The nonsequential nature of online media can be particularly challenging to writers who come from the world of print media.