10. A method comprising: 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; generating a syndication script for obtaining logic and metadata for injecting native advertisements in the HTML document based on the one or more section codes; providing the syndication script in response to a request generated by the single script block; and providing one or more native advertisements 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, wherein the metadata includes an XPath per section identifying nodes within a Document Object Model of the HTML document as native ad placement containers, wherein the syndication script obtains, from an advertisement server, logic for filtering child nodes within the Document Object Model to include only matching structures of the XPath(s) for subsequent injections of native advertisements, and obtains metadata for auto formatting data based on content of the HTML document.
14. The method of claim 10 , wherein the single script block is generated in response to inputs at a user interface for creating the one or more ad units for the HTML document.