• Commercial scripts run under their own bundle, with the root script /bootstraps/commercial.js
• The commercial bundle only runs if the browser passes the isModernBrowser check (i.e. not IE8)
• We interface with Doubleclick for Publishers using the dfp-api.js module. Most advertising on The Guardian involves a roundtrip to DFP somehow.
• Individual commercial features are switched on and off in the commercial-features.js module. You can see which features are on at any time by opening your console and viewing guardian.config.commercial.featuresDebug

See DFP Advertising for details on how we target, fetch and render adslots.