Title: HTML5 Fallback, Async & Firefox
Last modified: August 15, 2017
---
# HTML5 Fallback, Async & Firefox
* [Maarten.Provo](https://wordpress.org/support/users/maartenprovo/)
* (@maartenprovo)
* [8 years, 10 months ago](https://wordpress.org/support/topic/html5-fallback-async-firefox/)
* Hello
* I am using a Contact Form 7 form with a date-field along with W3TC and async-
loading of javascripts.
* I’ve enabled the HTML5-fallback for the date-field to display a jQuery date-picker
in IE and Firefox. However, both jQuery and its date-picker are loaded asynchronous
through W3TC. Now for some reason, this works fine in IE but in Firefox it returns
a ‘jQuery is not defined’-error.
* Is there any way to fix this without giving up on the async-loading?
* The page I need help with: _[[log in](https://login.wordpress.org/?redirect_to=https%3A%2F%2Fwordpress.org%2Fsupport%2Ftopic%2Fhtml5-fallback-async-firefox%2F%3Foutput_format%3Dmd&locale=en_US)
to see the link]_
The topic ‘HTML5 Fallback, Async & Firefox’ is closed to new replies.
* 
* [Contact Form 7](https://wordpress.org/plugins/contact-form-7/)
* [Frequently Asked Questions](https://wordpress.org/plugins/contact-form-7/#faq)
* [Support Threads](https://wordpress.org/support/plugin/contact-form-7/)
* [Active Topics](https://wordpress.org/support/plugin/contact-form-7/active/)
* [Unresolved Topics](https://wordpress.org/support/plugin/contact-form-7/unresolved/)
* [Reviews](https://wordpress.org/support/plugin/contact-form-7/reviews/)
* 0 replies
* 1 participant
* Last reply from: [Maarten.Provo](https://wordpress.org/support/users/maartenprovo/)
* Last activity: [8 years, 10 months ago](https://wordpress.org/support/topic/html5-fallback-async-firefox/)
* Status: not resolved