TAG:  script
<script> ... </script>
Available in versions: 3.2, 4.0
Browser compatibility: Explorer 4, 5  Netscape 4, 6
 
The <script> tag is used to place script code inside the head and body elements of an HTML code document. For all practical purposes, this tag is primarily used to allow the execution of JavaScript code inside HTML code (and, to a lesser extent, VBScript).
 
Unfortunately, not all browsers (especially older browsers) recognize this tag. It is recommended that you place an HTML opening comment tag right after the opening script tag and a closing comment tag immediately before the closing /script tag. A JavaScript enabled browser will ignore these comment tags and execute the code. Conversely, a browser that does not recognize JavaScript will treat the contents as simply a comment and not crash your page.
 
The closing tag is mandatory.
 
Core Attributes
 
None.
 
Attributes
 
charset
The charset attribute is used to define the character set that was used to write the script.
 
defer
The defer attribute informs the server that the script will not alter the contents of the page on the server-side. This is intended to allow the server to load the page faster. (In JavaScript, this means no document.write statements.)
 
language    deprecated 4.0
The language attribute is the name of the script language, such as VBScript, JavaScript, JavaScript 1.1, and JavaScript 1.2. This attribute is deprecated effective with version 4.0. You are now to use the type attribute. However, most browsers continue to recognize this attribute.
 
src
The src attribute is the URL of a file that contains a script code. This is useful when you need to use repeatedly a long script program. The browser will load and execute the script as a separate file.
 
type
The type attribute is used to define the script language being used. The two most common values are text/javascript and text/vbscript
 
This example uses the script tag to place a JavaScript function in the head element to see if two form fields (firstname and lastname) have been left blank.
 
Code:
<head>
<title>DevGuru JavaScript Example</title>
<script language="JavaScript">
<!--
function checksubmit()
{
   if (document.formname.firstname.value == "")
   {
      alert("Please enter your full name")
      document.formname.firstname.focus()
      return false
   }
   if (document.formname.lastname.value == "")
   {
      alert("Please enter your email address")
      document.formname.lastname.focus()
      return false
   }
   return true
)
-->
</script>
</head>

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