Thanks, I want to know, what is new research on HTML?

What are the common properties we can use in CSS3 and what do we have to be careful of in terms of presentation?
How does CSS3 link to HTML5? What’s the link. CSS3 has kind of been grouped with HTML5, why is this?

There’s none. CSS is a stylesheet langauge and html 5 is a mark up language. They are different things entirely. It’s just marketing hype trying to “sexy” things up - html5 is ‘new’ css3 is ‘new’ so lets lump them together.