HTML 5 <script> tag
Definition and Usage
Defines a script, such as a JavaScript.
Differences Between HTML 4.01 and HTML 5
HTML 5 has some new attributes, and some HTML 4.01 attributes are no longer
supported.
Tips and Notes
Note: There are ways a script can be executed:
The async attribute is "true": The script will be executed asynchrously with
the rest of the page, so the script will be executed while the page continues
the parsing.
The async attribute is "false", but the defer attribute is "true": The script
will be executed when the page is finished with the parsing.
Both the async attribute and the defer attribute is "false": The script will
be executed immediately, and the page will wait for the script to finish before
continuing the parsing.
Tip: If there is a src attribute, the <script> element must be empty.
Example
| Source |
Output |
<script type="text/javascript">
document.write("Hello World!")
</script> |
|
Attributes
- 4: indicates if the attribute is defined in HTML 4.01
- 5: indicates if the attribute is defined in HTML 5
| Attribute |
Value |
Description |
4 |
5 |
| async |
true
false |
Defines if the script should be executed asynchronously or
not |
|
5 |
| type |
text/ecmascript
text/javascript
application/ecmascript
application/javascript
text/vbscript |
Indicates the MIME type of the script |
4 |
5 |
| charset |
charset |
Defines the character encoding used in script. Not
supported. |
4 |
|
| defer |
true
false |
Indicates that the script is not going to generate any
document content. The browser can continue parsing and drawing the page |
4 |
5 |
| language |
javascript
livescript
vbscript
other |
Specifies the scripting language. Not supported. Use the type
attribute instead. |
4 |
|
| src |
URL |
Defines a URL to a file that contains the script (instead of inserting the script
into your HTML document, you can refer to a file that contains the script) |
4 |
5 |
Try-It-Yourself Demos
Insert a script
How to insert a script into your HTML document.
Work with browsers that do not support scripts
How to handle browsers that do not support scripting.
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