HTMLIFrameElement: browsingTopics property
Deprecated
To be removed
This feature is pending removal from browsers. Using it now may lead to broken functionality in future updates. Following the announcement that Chrome will maintain its current approach to third-party cookies, Chrome decided to withdraw certain Privacy Sandbox features including the topics API.
Non-standard: This feature is not standardized. We do not recommend using non-standard features in production, as they have limited browser support, and may change or be removed. However, they can be a suitable alternative in specific cases where no standard option exists.
Warning: This feature is currently opposed by two browser vendors. See the Standards positions section for details of opposition.
The browsingTopics property of the HTMLIFrameElement interface is a boolean specifying that the selected topics for the current user should be sent with the request for the associated <iframe>'s source in a Sec-Browsing-Topics header. This reflects the browsingtopics HTML attribute.
Value
A boolean. The default value is false; set it to true to send the associated <iframe> source request with a Sec-Browsing-Topics header containing the selected topics for the current user.
Examples
Get
Set browsingtopics to true then load the <iframe> contents declaratively:
<iframe browsingtopics title="Advertising container" src="ad-tech1.example">
...
</iframe>
Log the browsingTopics value via script:
const iframeElem = document.querySelector("iframe");
console.log(iframeElem.browsingTopics); // will return true in supporting browsers
Set
Specify a minimum <iframe>:
<iframe> ... </iframe>
Set browsingtopics to true then load the <iframe> contents via script:
const iframeElem = document.querySelector("iframe");
iframeElem.browsingTopics = true;
iframeElem.title = "Advertising container";
iframeElem.src = "ad-tech1.example";
Specifications
This feature is not part of an official standard, although it is specified in the Topics API Unofficial Proposal Draft.