Use Sandboxed JavaScript Instead of Inline Custom HMTL
Sandboxed JavaScript Custom Templates vs. Inline Custom HTML in GTM — A Vendor-by-Vendor Migration Guide Published · Tags: GTM, Google Tag Manager, Sandboxed JavaScript, Custom Templates, CSP, Custom HTML, Survicate, Demandbase, Terminus, Indeed Conversions, Pardot, StackAdapt Note: Every template referenced below is published as a raw .tpl file on GitHub — not a full container export. Each one is a drop-in replacement for a specific inline Custom HTML tag that marketing/martech vendors hand you as a copy-paste script block. Import instructions are at the bottom of this post. If you've managed a GTM container for more than a few months, you already have a folder called something like "Vendor Pixels" full of Custom HTML tags . Every one of them was pasted straight from a vendor's onboarding email, and every one of them injects a <script> element directly onto the page. That works — right up until your security team turns on a strict Content-Securit...