What is HTML <script> defer Attribute
Definition and Usage
The defer attribute is a boolean attribute.
If the defer attribute is set, it specifies that the script is downloaded in parallel to parsing the page, and executed after the page has finished parsing.
Note: The defer attribute is only for external scripts (should only be used if the src attribute is present).
Note: There are several ways an external script can be executed:
- If
asyncis present: The script is downloaded in parallel to parsing the page, and executed as soon as it is available (before parsing completes) - If
deferis present (and notasync): The script is downloaded in parallel to parsing the page, and executed after the page has finished parsing - If neither
asyncordeferis present: The script is downloaded and executed immediately, blocking parsing until the script is completed
Browser Support
The numbers in the table specify the first browser version that fully supports the attribute.
Syntax
<script defer>
Category: | Web Tutorial |
Sub Category: | HTML Tag |
Uploaded by: | Admin |