In which occasions you would like to use italics in web design? Because the use of bold fonts is quite obvious not sure about italics.
I often use strong for keywords and keyphrases after reading somewhere that indexing bots take "strong" and "em" tags into account (I have not been able to tell if it is indeed the case. But it prompted me to take emphasis into account).
I use the two elements for different levels of emphasis. I like to think the strong-taged words to be relevant if you were to summarize the content. whereas em-taged words would come into play for a different kind of emphasis.
I used em once for names in texts which at the same time were links to profile pages of these people. So I use em for another kind of emphasis. This use however, might make more sense if
This has nothing to do with grammar or proper use of the language. It even might be wrong :) It's just my two cents on the matter. Hope this helps you anyway.
From a technical standpoint, you should use italics whenever writing titles of books or films. Things like that.
Italics are used for emphasis. When you want to draw attention to a word. Which is similar to bold, but italics doesn't seem to "jump out" as much. You should never italics a whole paragraph or other huge chunk of text. But you can use it as part of a layout. You could italicize your title, for instance.
Creatively, there's a lot of directions you could go in, in my opinion. But, don't overuse it either.
Here are some resources on topics for italics:
All in all, it's a personal aesthetic decision. If it looks good, keep it. If it doesn't, kill it.