Which browsers support script async async

Question

On December 1  2009  Google announced support for asynchronous Google Analytics tracking   The asynchronous tracking is achieved using the async directive for the  lt script gt  tag   Which browsers support the async directive   lt script async  async    gt   and since which version

User · Answer

From your referenced page   http   googlecode blogspot com 2009 12 google-analytics-launches-asynchronous html     Firefox 3 6 is the first browser to officially offer support for this new feature  If you re curious  here are more details on the official HTML5 async specification

User · Answer

The async support as specified by google is achieved using two parts    using script on your page  the script is supplied by google  to write out a  lt script gt  tag to the DOM  that script has async  true  attribute to signal to compatible browsers that it can continue rendering the page    The first part works on browsers without support for  lt script async   tags  allowing them to load async with a  hack   although a pretty solid one   and also allows rendering the page without waiting for ga js to be retrieved      The second part only affects compatible browsers that understand the async html attribute   FF    3 6    FF for Android All Versions IE    10    starting with preview 2  Chrome 8   Chrome For Android All versions Safari 5 0  iOS Safari 5 0  Android Browser 3 0   honeycomb on up  Opera 15 0  Opera Mobile 16 0  Opera Mini None  as of 8 0    The  html5 proper  way to specify async is with a   lt script async src        not  lt script async  true     However  initially browsers did not support this syntax  nor did they support setting the script property on referenced elements   If you want this  the list changes    FF 4  IE 10   preview 2 and up  Chrome 12  Chrome For Android 32  Safari 5 1  No android versions

User · Answer

There s two parts to this question  really    Q  Which browsers support the  async  attribute on a script tag in markup   A  IE10p2   Chrome 11   Safari 5   Firefox 3 6  Q  Which browsers support the new spec that defines behavior for the  async  property in JavaScript  on a dynamically created script element   A  IE10p2   Chrome 12   Safari 5 1   Firefox 4    As for Opera  they are very close to releasing a version which will support both types of async  I ve been working with them closely on this  and it should come out soon  I hope     More info on ordered-async  aka   async false   can be found here  http   wiki whatwg org wiki Dynamic Script Execution Order  Also  to test if a browser supports the new dynamic async property behavior  http   test getify com test-async

User · Answer

The async is currently supported by all latest versions of the major browsers  It has been supported for some years now on most browsers   You can keep track of which browsers support async  and defer  in the MDN website here  https   developer mozilla org en-US docs HTML Element script

User · Answer

A comprehensive list of browser versions supporting the async parameter is available here

User · Answer

Just had a look at the DOM  document scripts 1  attributes  of this page that uses google analytics  I can tell you that google is using async       type  text javascript   async     src  http   www google-analytics com ga js

[javascript] Which browsers support <script async="async" />?

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