How to AB test two tags?

[craig_rouse · Accepted solution]

Hi Chen,

I think this post will answer your question: https://community.tealiumiq.com/t5/Developers/Split-Segmentation-Extension/m-p/1231

Please don't hesitate to ask if anything is unclear.

Craig.

[chen_shu]

This post is exactly what I needed. One question. I will be setting the scope of the extension to two tags. In step 5 of "Configuring the Extension", since I'm not using Pre Loader scope, so I should leave the cookie domain field blank? And what does it mean "to use the configuration domain setting"?

[craig_rouse]

If you want to use the cookies set by the extension in load rules (i.e. you want to use the extension to trigger your "A" and "B" tags), then the extension must be scoped to pre-loader. Otherwise, the extension will fire after the load rules and the load rules will not work (nothing will happen - the tags will not fire). When using the extension in pre-loader scope, the auto domain setting will not work, so you'll have to use "document.location.hostname". This could probably be clearer on the documentation, so if this helps you, let me know and I'll get it updated.

[chen_shu]

If we use "location.hostname" as the cookie domain, what happens if user goes to another page which may be served from another host?

[craig_rouse]

location.hostname is your only option, unfortunately. Cookies can only be set on the current domain, so if you leave the domain and go to another one (e.g. www.tealium.com ==> www.google.com), the cookie is lost. If you have one Tealium profile that's used on both domains, the extension will run once for each domain, and the cookie will be set once per domain. The A/B test will still work the same as it does on the primary domain. Hopefully I've understood the question correctly - do let me know if you had another scenario in mind.