HTML5 has given web designers and developer more power in structuring layouts. New elements and attributes are introduced which are very helpful in developing modern websites. Creating rounded corners in HTML was hell of task but with HTML5 new attributes, it’s no more a task. Unfortunately HTML5 is not yet fully supported in major browsers. With new improvements to HTML5 occurring quite regularly, it is quite difficult to keep in mind all the new different features.
Just to stay updated and get quick references I am listing HTML5 cheat sheets here.