轮播广告素材

使用共享存储空间来确定用户在各网站上看到的广告素材。

Shared Storage API 是一个适用于通用跨站存储的 Privacy Sandbox 提案，支持许多可能的用例。例如，广告素材轮播功能可在 Chrome 104.0.5086.0 及更高版本中进行测试。

借助广告素材轮播，您可以存储广告素材 ID、观看次数和用户互动等数据，以确定用户在不同网站上会看到哪些广告素材。

运行共享存储空间 Worklet，根据存储的数据从提供的列表中选择一个网址，然后在围栏框架中呈现该广告素材。此类型可用于选择新广告或其他内容。

尝试广告素材轮播

要使用共享存储空间尝试广告素材轮播，请确认您使用的是 Chrome 104.0.5086.0 或更高版本。启用 chrome://settings/adPrivacy 下的所有广告隐私权 API。

您还可以在命令行中使用 --enable-features=PrivacySandboxAdsAPIsOverride,OverridePrivacySandboxSettingsLocalTesting,SharedStorageAPI,FencedFrames 标志启用共享存储空间。

试用代码示例

广告客户或内容制作者可能希望对广告系列应用不同的策略，并轮播内容或广告素材以提高效果。共享存储空间可用于在不同网站上运行不同的轮替策略，如顺序轮播和均匀分布轮播。

在此示例中：

  • creative-rotation.js 嵌入在帧中。此脚本设置哪些广告最重要（权重），并调用 Worklet 以确定应该显示哪些内容。
  • creative-rotation-worklet.js 是共享存储空间 Worklet，用于确定内容的加权分布并返回应显示的返回。

creative-rotation.js

// Ad config with the URL of the content, a probability weight for rotation, and the clickthrough rate.
const DEMO_CONTENT_CONFIG = [
  {
    url: 'https://your-server.example/contents/content-1.html',
    weight: 0.7,
  },
  {
    url: 'https://your-server.example/contents/content-2.html',
    weight: 0.2,
  },
  {
    url: 'https://your-server.example/contents/content-3.html',
    weight: 0.1,
  },
];

// Set the mode to sequential and set the starting index to 0.
async function seedStorage() {
  await window.sharedStorage.set('content-rotation-mode', 'sequential', {
    ignoreIfPresent: true,
  });

  await window.sharedStorage.set('content-rotation-index', 0, {
    ignoreIfPresent: true,
  });
}

async function injectAd() {
  // Load the worklet module
  await window.sharedStorage.worklet.addModule('content-rotation-worklet.js');

  // Initially set the storage to sequential mode for the demo
  seedStorage();

  // Run the URL selection operation to determine the next content rendered.
  const urls = DEMO_CONTENT_CONFIG.map(({ url }) => ({ url }));
  const fencedFrameConfig = await window.sharedStorage.selectURL('content-rotation', urls, { 
    data: DEMO_CONTENT_CONFIG,
    resolveToConfig: true
  });

  // Render the opaque URL into a fenced frame
  document.getElementById('content-slot').config = fencedFrameConfig;
}

injectAd();

creative-rotation-worklet.js

class SelectURLOperation {
  async run(urls, data) {
    // Read the rotation mode from Shared Storage
    const rotationMode = await this.sharedStorage.get('content-rotation-mode');

    // Generate a random number to be used for rotation
    const randomNumber = Math.random();

    let index;

    switch (rotationMode) {
      /**
       * Sequential rotation
       * - Rotates the contents in order
       * - Example: A -> B -> C -> A ...
       */
      case 'sequential':
        const currentIndex = await this.sharedStorage.get('creative-rotation-index');
        index = parseInt(currentIndex, 10);
        const nextIndex = (index + 1) % urls.length;

        await this.sharedStorage.set('content-rotation-index', nextIndex);
        break;

      /**
       * Weighted rotation
       * - Rotates the contentswith weighted probability
       * - Example: A=70% / B=20% / C=10%
       */
      case 'weighted-distribution':
        
        // Sum the weights cumulatively, and find the first URL where the
        // sum exceeds the random number. The array is sorted in
        // descending order first.
        let weightSum = 0;
        const { url } = data
          .sort((a, b) => b.weight - a.weight)
          .find(({ weight }) => {
            weightSum += weight;
            return weightSum > randomNumber;
          });

        index = urls.indexOf(url);
        break;

      default:
        index = 0;
    }
    return index;
  }
}

register('content-rotation', SelectURLOperation);

Use cases

These are only some of the possible use cases for Shared Storage. We'll continue to add examples as we receive feedback and discover new use cases.

Content selection

Select and display different content on different websites in fenced frames based on information collected in Shared Storage. The output gate for these use cases is URL selection.

  • Creative rotation: Store data, such as creative ID, view counts, and user interaction, to determine which creative users' see across different sites.
  • A/B testing: You can assign a user to an experiment group, then store that group in Shared Storage to be accessed cross-site.
  • Custom user experiences: Share custom content and calls-to-action based on a user's registration status or other user states

Generate summary reports

Collect information with Shared Storage and generated a noisy, aggregated summary report. The output gate for these use cases is the Private Aggregation API.

  • Unique reach measurement: Many content producers and advertisers want to know how many unique people saw their content. Use Shared Storage to record the first time a user saw your ad, embedded video, or publication, and prevent duplicative counting of that same user on different sites. You can then use the Private Aggregation API to output a summary report for your reach.
  • Demographics measurement: Content producers often want to understand the demographics of their audience. You can use Shared Storage to record user demographic data in a context where you have it, such as your first-party site, and use aggregated reporting to report on it across many other sites, such as embedded content.
  • K+ frequency measurement: Sometimes described as "effective frequency," there is often a minimum number views before a user will recognize or recall certain content (often in the context of advertisement views). You can use Shared Storage to build reports of unique users that have seen a piece of content at least K number of times.

互动和分享反馈

共享存储空间提案正在积极讨论，可能会发生变化 。如果您试用此 API 并有反馈意见，我们非常期待收到您的反馈意见。