You define rules in the Activation web client, as shown in this illustration.
alert("Hello Chrome - this is a DM rule");
Once you define and approve Activation rules using the Activation web client, you can embed these rules into AEM web pages. When this rule is embedded into an AEM web page, this rule is fired when an AEM web page is opened in Chrome, as shown in this illustration.
To read this article, click https://helpx.adobe.com/experience-manager/using/aem62_dtm.html.
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