Techniques are provided that include generating a single script block for placement at a single location on an HTML document in response to a creation of one or more ad units for the HTML document, the single script block including one or more section codes that correspond to one or more content blocks of the HTML document. A syndication script for obtaining logic and metadata is generated for injecting native advertisements in the HTML document based on the one or more section codes. The syndication script is provided in response to a request generated by the single script block, and one or more native advertisements are provided in response to an ad call generated by the syndication script, the one or more native advertisements for injection in the one or more content blocks of the HTML document based on the logic and metadata. The ad request may contain one or more sections containing the metadata of the XPath identifying nodes within a Document Object Model of the HTML document as native ad placement containers.