MHTL commands called elements.Usually, an element has a start tag and an end tag
e.g. <p>.....</p>
<!DOCTYPE html>
<html>
<head>---------Here is head section,and it is basically some kind of information that u don‘t see on the web page.
....head elements here
</head>
<body> ----------- The body section is more things u see on the web page !
..... the main web page content goes here
</body>
</html>
<!DOCTYPE html>
<html>
<head>
<title>A Simple Web Page</title>
<meta name = "author" content = "David Rossiter">
</head>
<body>
<h1>My Web Page</h1>------<h1> means level 1 heading
<p>This web page is so awesome!</p>--------<p>means paragraph
</body>
</html>
<title>A Simple Web Page</title>
<meta name = "author" content = "David Rossiter">
4.1 Anything in <head> is information about the web page , and does not usually get shown in the page.
So,the two lines state the title and the author.
4.2 All the information is told to the browers!
1.U need to use speech marks for any HMTL arributes,also the doule speech mark and the single speech mark are fine for browers.
e.g. <meta name = "author" content = "David Rossiter"> or
<meta name = ‘author‘ content = ‘David Rossiter‘>
原文：http://www.cnblogs.com/BJTUzhengli/p/5143811.html