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Allow all HTML attributionsrc surfaces to make multiple background requests #744

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Apr 3, 2023
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Allow all HTML attributionsrc surfaces to make multiple background requests #744

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Allow all HTML attributionsrc surfaces to make multiple background re…
apasel422 Mar 29, 2023
a313073
minor fixes
apasel422 Mar 29, 2023
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27 changes: 17 additions & 10 deletions EVENT.md
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Expand Up @@ -147,16 +147,23 @@ window.open(
attributionsrc="https://adtech.example/attribution_source?my_ad_id=123">
```

Specifying a URL value for `attributionsrc` within `<a>`, `<img>`, `<script>` or
`window.open` will cause the browser to initiate a separate `keepalive` fetch
request which includes the `Attribution-Reporting-Eligible` request header.

When the `attributionsrc` attribute is present in these surfaces/APIs, both with
and without a value, existing requests made via `src`/`href` attributes or
`window.open` will now include the `Attribution-Reporting-Eligible` request
header. Each of these requests will be able to register attribution sources.

`event` sources can also be registered using existing JavaScript request
The `attributionsrc` attribute on `<a>`, `<img>`, and `<script>` may be empty or
non-empty. If it is non-empty, it contains a space-separated list of URLs
to which the browser will initiate a separate `keepalive` fetch request in the
background. If it is empty, no background requests will be made. In both
cases, the request(s) (originating from `href`, `src`, or `attributionsrc`) will
contain an `Attribution-Reporting-Eligible` header that indicates the types of
registrations that are allowed in the response.
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For `<a>` and `window.open`, background requests, if any, are made when the user
navigates. For `<img>` and `<script>`, background requests are made when the
`attributionsrc` attribute is set on the DOM element.

In JavaScript, `window.open` also supports an empty or non-empty
`attributionsrc` feature, though it **does not yet support multiple values** due
to complexity in parsing the feature string.

`event` sources can also be registered using existing JavaScript request
APIs by setting the `Attribution-Reporting-Eligible` header manually:

```javascript
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