CustomHTMLIntegration
Custom HTML tag setup
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Open Google Tag Manager.
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Click Tags.
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Click New.

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Name your tag.
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Click Tag Configuration.
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Select Custom HTML.

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Configuration settings
Section Required/Optional Description HTML Required Copy and paste your HTML/Javascript into the textbox. Be sure to wrap Javascript snippets with <script></script>.
Paste your Rokt integration code with the variable you have set up (e.g., email:{{dl_email}}). If you don't have your custom snippet, you can use the snippet found in Getting Started.Support document write Required Google Tag Manager is offering a new engine for rendering Custom HTML tags. The new engine includes support for calls to document.write(). 
Enable the Support document write check-box.