# Are mixin for prefixes needed? (RC4)

**URL:** <https://forum.ionicframework.com/t/are-mixin-for-prefixes-needed-rc4/75441>\
**Category:** ionic-v3\
**Created:** [January 7, 2017, 9:22am UTC](https://forum.ionicframework.com/t/are-mixin-for-prefixes-needed-rc4/75441 "2017-01-07T09:22:01Z")\
**Posts on this page:** 2\
**Page:** 1

<div class="post-metadata">

**Author:** ![chanphillip](https://sea1.discourse-cdn.com/ionicframework/user_avatar/forum.ionicframework.com/chanphillip/32/105478_2.png) [@chanphillip](https://forum.ionicframework.com/u/chanphillip)\
**Post date:** [January 7, 2017, 9:22am UTC](https://forum.ionicframework.com/t/are-mixin-for-prefixes-needed-rc4/75441/1 "2017-01-07T09:22:01Z")

</div>

I just realized if I just put

```
filter: blur(4px);

```

After build, it becomes

```
-webkit-filter: blur(4px);
filter: blur(4px);

```

So do I still need to use mixins to handle compatibility?

---

<div class="post-metadata">

**Author:** ![mirkonasato](https://sea1.discourse-cdn.com/ionicframework/user_avatar/forum.ionicframework.com/mirkonasato/32/131398_2.png) [@mirkonasato](https://forum.ionicframework.com/u/mirkonasato)\
**Post date:** [January 7, 2017, 10:51am UTC](https://forum.ionicframework.com/t/are-mixin-for-prefixes-needed-rc4/75441/2 "2017-01-07T10:51:02Z")

</div>

I think the build uses [autoprefixer](https://github.com/postcss/autoprefixer#autoprefixer-).