Hello all, I am back. I am glad to come back and to have my father recover well to the treament. He was diagnosed with Neuro Endocrine Carcinoma of Rectum (something related to colorectal cancer). I am planning on writing about his diagnosis and what he(and we) went through all this time. But good heavens, and wishes from a lot of friends and relatives - He is doing very well now.
Application cache (appcache) is a powerful feature in HTML5. However, it does come with baggage. Many (see links below) advocated ferociously against it due to tricky issues it comes with. For someone who is just testing waters, these issues may throw them off grid. Knowing them before hand helps reduce some unpredictable effects.