HTML5 <script> Tag
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Definition and Usage
The script element either contains scripting statements or it points to an external script file through the src attribute.
Differences Between HTML 4.01 and HTML5
The type attribute is required in HTML 4, but optional in HTML5.
The "async" attribute is new in HTML5.
Some HTML 4.01 attributes are not supported in HTML5.
Tips and Notes
Note: There are several 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.
New : New in HTML5.
|asyncNew||async||Defines if the script should be executed asynchronously or not|
|charset||charset||Defines the character encoding used in script|
|defer||defer||Indicates that the script is not going to generate any document content. The browser can continue parsing and drawing the page|
|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)|
|xml:space||preserve||Not supported in HTML5|