Structure in web pages :
### Many web pages act like electronic versions of documents
In all kinds of documents, structure is very important in helping readers to understand the messages you are trying to convey and to navigate around the document
Html5 Layout :
HTML5 introduces a new set of elements that allow you to divide up the parts of a page. The names of these elements indicate the kind of content you will find in them. They are still subject to change, but that has not stopped many web page authors using them already
as you can see its amke it easyer contoll how you want your structure to look like
For a long time, web page authors used <div> elements to group together related elements on the page (such as the elements that form a header, an article, footer or sidebar). Authors used class or id attributes to indicate the role of the <div> element in the structure of the page.
Extra Markup
Since the web was first created, there have been several different versions of HTML.
Each new version was designed to be an improvement on the last (with new elements and attributes added and older code removed).
There have also been several versions of each browser used to view web pages, each of which implements new code. Not all web users, however, have the latest browsers installed on their computers, which means that not everyone will be able to view all of the latest features and markup.
Where you should be particularly aware of browsers not supporting certain features, I have made a note of this (as you have seen with some of the HTML5 elements introduced in the Forms chapter — and as you will see in the CSS chapters).