# \[Ionic 4\] Disable IE11 polyfill for css variables

**URL:** <https://forum.ionicframework.com/t/ionic-4-disable-ie11-polyfill-for-css-variables/189254>\
**Category:** Ionic Framework\
**Created:** [May 12, 2020, 3:47pm UTC](https://forum.ionicframework.com/t/ionic-4-disable-ie11-polyfill-for-css-variables/189254 "2020-05-12T15:47:15Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![paulintrognon](https://avatars.discourse-cdn.com/v4/letter/p/a9adbd/32.png) [@paulintrognon](https://forum.ionicframework.com/u/paulintrognon)\
**Post date:** [May 12, 2020, 3:47pm UTC](https://forum.ionicframework.com/t/ionic-4-disable-ie11-polyfill-for-css-variables/189254/1 "2020-05-12T15:47:15Z")

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Hi, I use Ionic 4 (for IE11 reasons) and I need to use css-variables, but in an async way : I am fetching css variables from a webservice, and then I need to apply them.

My problem: I can’t use this approach with Ionic 4, because it hard-replaces all my css-variables in IE11. So when I get my css variables, there are no variables left in my css code to be replaced.

I could not see any option to disable IE11 CSS Variable polyfill. Is there any? Or is there any other way I can solve async theming in ionic in IE11?

Cheers!