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The analytics at one of our clients indicated that some 40% of the visitors did not have Javascript enabled. This was a shock, and something we hadn't seen before. We needed a way to verify that the analytics was reporting accurately.

Our development team found this interesting approach to setting up a test of how Javascript is used by your audience.

The greatest threat to the accuracy of your analytics data is inconsistent implementation. Too often, Javascript "Tags" are left off of some pages, put on some pages twice or simply implemented wrong. And, as your site changes, more inconsistencies are created.

This affects more than just analytics tools. Advertising networks, ratings and review systems, user feedback systems and more rely on properly implemented javascript tags.

The promise of "Tag Managers" is that you can put one set of code on all of your pages, and then control, monitor and edit the javascript for all of these tags in one place, using rules to determine which tags get placed on which pages. It's another way for marketing to monitor the implementation of online systems without being beholden to IT.

Yay!

So, how are the biggest ecommerce companies using Tag Managers? Here's your answer.

In their own words:8. Conversion Sciences Blog Conversion Sciences is another A/B testing conversion optimization agency that has stood the test of time (it was founded in 2007). In this blog you can find some remarkable and noteworthy ideas about A/B testing and conversion optimization. What to read: AB Testing JavaScript: Great Power, Great ProblemsHow to Avoid Mobile-Friendly Redesign DisastersAB Testing Inspiration: Using Emotional TriggersHow Google Reviews Drive Conversions for Local Businesses

@_EricElliott makes a strong case for choosing Web apps for your mobile users over deploying native apps through the app stores. We can add to this that AB testing Web apps (Elliott calls them progressive web apps) is easier with the tools we have. Many advanced tools don't yet support native applications.

However, responsive web designs aren't enough. You should still put the effort in to craft a mobile-centric web app, as if you were developing a native app.