How do the phrases "star-cross'd lovers" and "death-mark'd love" introduce the themes of love and fate in the prologue to Romeo and Juliet?

They have very similar meanings. "Death-mark'd love" is pretty self explanatory, and "star-cross'd lovers" are lovers that are fated for doom. This basically foreshadows the fate of Romeo and Juliet and what will likely happen to them due to their forbidden love. Unfortunately I don't have the prologue on me nor did I read it in a very long time, so I can't provide evidence. But that's basically what it is trying to say.