Get to know the new Topics API for the Privacy Sandbox
电视市场新变局：IPTV何时能“拱翻”有线电视？
百度 另外，开花早期如果出现明显降水和大风天气，对花期影响较小，但若在盛花期后期或落花期出现较和大风天气，可能会出现花朵一夜落光的情况。Topics is a proposal in Privacy Sandbox designed to preserve privacy while showing relevant content and ads. The browser will infer a handful of recognizable, interest-based categories based on recent browsing history to help sites serve relevant ads. With Topics, the specific sites you’ve visited are no longer shared across the web, like they might have been with third-party cookies.
How it works
There are two main parts to Topics. First, the API labels each website from a set of recognizable, high-level topics. For example, the browser would match a sports website with the topic "Sports". Then, the browser collects a few of the most frequent topics associated with the websites you’ve visited. These topics are then shared (one new topic per week) with the sites you visit to help advertisers show you more relevant ads, without needing to know the specific sites you’ve visited.
The browser will use a limited set of topics selected from a human-curated, publicly visible list. The updated list contains around 469 topics - we limit the taxonomy’s size to reduce the risk of fingerprinting. Additionally, Chrome aims to maintain a topics list that does not include sensitive categories (i.e. race, sexual orientation, religion, etc.).
You will be able to see the topics and remove any you don’t like, or disable them completely in Chrome Settings.
Frequently Asked Questions
In Chrome settings, you will be able to find which topics have been generated based on your recent browsing history. You will be able to block specific topics or opt out of the Privacy Sandbox technologies completely.
Chrome proposed an initial list of topics publicly in January 2022. Based on ecosystem feedback, Chrome announced an updated list of topics in June 2023. Chrome expects the taxonomy to evolve over time, and for governance of the taxonomy to eventually transition to an external party representing stakeholders from across the industry. We encourage the ecosystem to review the latest taxonomy and provide feedback on the changes.
As Topics uses a recognizable and human-curated list of topics to help infer what ads you will see, Chrome can and will take steps to avoid topics that might be sensitive (i.e. race, sexual orientation, religion, etc.). However, it is still possible that websites calling the API may combine or correlate topics with other signals to infer sensitive information, outside of intended use. Chrome will continue to investigate methods for reducing this risk.
First, Chrome determines the topics associated with websites. For example, a yoga website might be classified as being related to "Fitness". These topics are assigned to the websites themselves, not you. Then, Chrome keeps a handful of your most frequently visited topics in a given week, and participating sites show you ads based on these topics.
The calculation of the most frequent topics occurs entirely within the browser, without sharing data with external servers. The resulting topics may be sent to servers in an anonymous way for sensitivity and abuse analysis.
Yes. Only sites that are using Topics or have at least one embedded service that uses the Topics API, will be included in topics generation. Sites can also specifically opt-out using Permission Policy, an existing browser mechanism that is used to control features like camera access.
If a website had opted out of FLoC, the Topics API will respect that decision.
Privacy Sandbox Learning Hub is a good place to start. You can also review "What is the Topics API?" on developer.chrome.com.