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Continue to ChatQuery : Blogger allows you to add arbitrary HTML content, including Javascript and frames, anywhere in your template. As long as your advertising system doesn't require server-side code on the blog (or https://vmapp.org/query/76908/Blogger-Allows-You-To-Add-Arbitrary-HTML-Content-Including-Javascript-And-Frames-Anywhere-In-Your-Template-As-Long-As-Your-Advertising-System-Doesn-T-Require-Server-Side-Code-On-The-Blog-Or/