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defer attribute for external scripts

Last updated on : 2023-03-20

Note:

defer attribute for external scripts shows a browser compatibility score of 100. This is a collective score out of 100 to represent browser support of a web technology. The higher this score is, the greater is the browser compatibility. The browser compatibility score is not a 100% reflection for every browser and the web technology support. However, it does give you an estimate on how much you should rely on a particular web technology in terms of browser compatibility.

Overview

Using the boolean defer attribute allows the external JavaScript file to run when the DOM is loaded, without delaying page load first.

Specifications

HTML Standard # the-script-element

Code snippets

Document.currentScript.html

Source:Document.currentScript.html

Browser Compatibility

defer attribute for external scripts on IE is fully supported on 10-11, partially supported on 5.5-9, and not supported on below 5.5 IE versions.
defer attribute for external scripts on Edge is fully supported on 12-111, partially supported on None of the versions, and not supported on below 12 Edge versions.
defer attribute for external scripts on Firefox is fully supported on 3.6-113, partially supported on None of the versions, and not supported on 2-3 Firefox versions.
defer attribute for external scripts on Chrome is fully supported on 8-114, partially supported on None of the versions, and not supported on 4-7 Chrome versions.
defer attribute for external scripts on Safari is fully supported on 5.1-16.4, partially supported on None of the versions, and not supported on 3.2-4 Safari versions.
defer attribute for external scripts on Opera is fully supported on 15-95, partially supported on None of the versions, and not supported on 9.5-12.1 Opera versions.
defer attribute for external scripts on Safari on iOS is fully supported on 5-16.4, partially supported on None of the versions, and not supported on 3.2-4 Safari on iOS versions.
defer attribute for external scripts on Android Browser is fully supported on 3-111, partially supported on None of the versions, and not supported on 2.1-2.2 Android Browser versions.
defer attribute for external scripts on Opera Mobile is fully supported on 64-73, partially supported on None of the versions, and not supported on 10-12 Opera Mobile versions.
defer attribute for external scripts on Chrome for Android is fully supported on 97-111, partially supported on None of the versions, and not supported on below 97 Chrome for Android versions.
defer attribute for external scripts on Firefox for Android is fully supported on 95-110, partially supported on None of the versions, and not supported on below 95 Firefox for Android versions.
defer attribute for external scripts on Samsung Internet is fully supported on 4-20, partially supported on None of the versions, and not supported on below 4 Samsung Internet versions.

100

High

Browser Compatibility Score

High

Browser Support For IE Versions

10-11

Fully

5.5-9

Partially

No Support

Edge

High

Browser Support For Edge Versions

12-111

Fully

Partially

No Support

Firefox

High

Browser Support For Firefox Versions

3.6-113

Fully

Partially

2-3

No Support

Chrome

High

Browser Support For Chrome Versions

8-114

Fully

Partially

4-7

No Support

Safari

High

Browser Support For Safari Versions

5.1-16.4

Fully

Partially

3.2-4

No Support

Opera

High

Browser Support For Opera Versions

15-95

Fully

Partially

9.5-12.1

No Support

Safari on iOS

High

Browser Support For Safari on iOS Versions

5-16.4

Fully

Partially

3.2-4

No Support

Android Browser

High

Browser Support For Android Browser Versions

3-111

Fully

Partially

2.1-2.2

No Support

Opera Mobile

High

Browser Support For Opera Mobile Versions

64-73

Fully

Partially

10-12

No Support

Chrome for Android

High

Browser Support For Chrome for Android Versions

97-111

Fully

Partially

No Support

Firefox for Android

High

Browser Support For Firefox for Android Versions

95-110

Fully

Partially

No Support

Samsung Internet

High

Browser Support For Samsung Internet Versions

4-20

Fully

Partially

No Support

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Last Modified date

2023-03-20