HTML <script> tag
Example
Insert a JavaScript in an HTML page:
<script type="text/javascript">
document.write("Hello World!")
</script>
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Try it yourself!
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Definition and Usage
The <script> tag is used to define a client-side script, such as a JavaScript.
The script element either contains scripting statements or it points to an
external script file through the src attribute.
The required type attribute specifies the MIME type of the script.
Common uses for JavaScript are image manipulation, form validation, and
dynamic changes of content.
Browser Support
The <script> tag is supported in all major browsers.
Differences Between HTML and XHTML
HTML 4 and XHTML deal different with the content inside scripts:
- In HTML 4, the content type is declared as CDATA, which means that
entities will not be parsed.
- In XHTML, the content type is declared as (#PCDATA), which means that
entities will be parsed.
This means that in XHTML, all special characters should be encoded or all
content should be wrapped inside a CDATA section.
To ensure that a script parses correctly in an XHTML document, use the
following syntax:
<script type="text/javascript"><![CDATA[
document.write("Hello World!")
//]]></script> |
Tips and Notes
Tip: Also look at the noscript element
for users that have disabled scripts in their browser or have a browser that
doesn’t support client-side scripting.
Required Attributes
DTD indicates in which DTD the attribute is
allowed. S=Strict, T=Transitional, and F=Frameset.
| Attribute |
Value |
Description |
DTD |
| type |
MIME-type |
Specifies the MIME type of a script |
STF |
Optional Attributes
| Attribute |
Value |
Description |
DTD |
| charset |
charset |
Specifies the character encoding used in an external script
file |
STF |
| defer |
defer |
Specifies that the execution of a script should be deferred
(delayed) until after the page has been loaded |
STF |
| src |
URL |
Specifies the URL of an external script file |
STF |
| xml:space |
preserve |
Specifies whether whitespace in code should be preserved |
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Standard Attributes
NONE
Event Attributes
NONE
…
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