HTML DOM Script defer Property

# Script defer Property

Script Object

## Example

Find out if a script was executed when a page was finished parsing:

var x = document.getElementById("myScript").defer

The result of x will be:

true
Try it yourself »

## Definition and Usage

The defer property sets or returns whether a script should be executed when a page has finished parsing, or not.

This property reflects the defer attribute of the <script> tag.

Note: The defer attribute is only for external scripts (and should only be used if the src attribute is present).

Note: There are several ways an external script can be executed:

- If async is present: The script is executed asynchronously with the rest of the page (the script will be executed while the page continues the parsing)
- If async is not present and defer is present: The script is executed when the page has finished parsing
- If neither async or defer is present: The script is fetched and executed immediately, before the browser continues parsing the page

## Browser Support

The defer property is supported in all major browsers.

Note: The defer attribute is not supported in Opera 12 and earlier versions.

## Syntax

Return the defer property:

scriptObject.defer

Set the defer property:

scriptObject.defer=true|false

## Property Values

Value | Description
--- | ---

true|false

Specifies whether a script should be executed when the page has finished parsing, or not

- true - The script is executed when the page has finished parsing
- false - The script will not be executed when the page has finished parsing

## Technical Details

Return Value: | A Boolean, returns true if the script is executed when the page has finished parsing, otherwise it returns false

## Related Pages

HTML reference: HTML <script> defer attribute

Script Object

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