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Setting vendor prefixes in CSS value

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This thread was started before GSAP 3 was released. Some information, especially the syntax, may be out of date for GSAP 3. Please see the GSAP 3 migration guide and release notes for more information about how to update the code to GSAP 3's syntax. 

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Hi guys,


Coming back to this forum for some simple trouble !


I have a flexbox layout, which tweens in many ways, and through many efforts GSAP and flexbox work (almost) perfectly together !


Everything works fine in latest Chrome, Firefox and IE (well, some minor border-radius tweening trouble in IE, but... meh).

The troublemakers are Safari / Safari iOS / Chrome iOS and buddies, which still need vendor prefixes for flexboxes.


As pointed out in this topic, we can set() prefixes in CSS PROPERTIES this way :

tl.set($('#myDiv'), {css:{"-webkit-flex":0}});

But how about setting prefixes in a CSS property VALUE ?

I have tried things like :

tl.set('#myDiv', {css:{display:'-webkit-flex', display:'flex'}});

As I feared, it seems to be considered a duplicate by browsers.

Testing various situations, I think only the last instance of 'display' is applied, which seems only logical.

Depending on the order, I get my tweens to work on webkit-based browsers, or the others ;-)


So, the questions are :

- is there a way to set display right cross-browser ?

- is there a way to do it simply ? xD


Cheers to all the GSAP team, you're awesome !






While looking for an answer, I got to : this stackoverflow topic


Based on the answers there, I got some workarounds with no tweens : toggling an HTML "flexBox" class with jQuery for instance.

.flexBox {
    display: -webkit-flex;
    display:  -ms-flexbox;
    display:         flex;
function addClassFlex(elem) {

tl.set('#myDiv', {onComplete:addClassFlex, onCompleteParams:[$('#myDiv')]});

Since I need this to happen at a precise point of my timeline, I got nothing better than this callback yet.

Does it sound ok to you guys ? Anything better to propose ? (awful use of callbacks, and I dislike messing with styles in the HTML...)

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  • Solution

Sure, you could do that. But I wouldn't do a set() - it should be a simple call() instead:

tl.call(addClassFlex, [$("#myDiv")]);

Or you could do a className set so that it works backwards and forwards in the timeline:

tl.set("#myDiv", {className:"+=flexBox"});

Do either of these work okay for you? 

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Hi Jack,


Yep, both work fine in cleaning my code (still learning GSAP, should've thought of call() at least !).


No better solution to provide than this class "flexBox" for the initial problem, I guess ? ;-)


Thx a lot !

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I can't think of a better solution right now, no :)

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Yup, thought so. Doesn't belong to GSAP's playground to begin with !


Thx a lot for your help, everything works fine now !

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