HTMLIFrameElement: browsingTopics property

Experimental: This is an experimental technology
Check the Browser compatibility table carefully before using this in production.

Non-standard: This feature is non-standard and is not on a standards track. Do not use it on production sites facing the Web: it will not work for every user. There may also be large incompatibilities between implementations and the behavior may change in the future.

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.

See Using the Topics API for more details.

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:

html
<iframe browsingtopics title="Advertising container" src="ad-tech1.example">
  ...
</iframe>

Log the browsingTopics value via script:

js
const iframeElem = document.querySelector("iframe");
console.log(iframeElem.browsingTopics); // will return true in supporting browsers

Set

Specify a minimum <iframe>:

html
<iframe> ... </iframe>

Set browsingtopics to true then load the <iframe> contents via script:

js
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.

Browser compatibility

BCD tables only load in the browser

See also