In order to make AB Tasty work with your site, you need to insert our tag. The tag comes in two versions: synchronous and asynchronous.
To find the two versions of the tag, go to the dashboard in your AB Tasty account, in 
> Settings > Tag implementation > Generic tag.
You will find the synchronous version, as well as the asynchronous version.
In synchronous mode, your website’s code scripts will load one after the other. A script can only be loaded if the previous one has finished loading. If a script is blocked, it will block the scripts after it from loading.
On the other hand, in asynchronous mode, the different calls to the scripts will be made at the same time. All of the scripts will load at the same time. In this case, if a script hangs up, it won't stop the other scripts from loading.
The disadvantage of an asynchronous tag is that the screen may seem to flicker if the modifications are applied after the site loads.
In most cases, we recommend using the synchronous tag for AB Tasty. If the tag is placed in your site’s <head> tag, you’ll be sure that your modifications will be applied immediately, before the site loads. This will avoid the flickering effect, and offer the best user experience.
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