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<pre class='metadata'>
Title: Attribution Reporting
Shortname: attribution-reporting
Level: 1
Status: CG-DRAFT
Group: wicg
Repository: WICG/attribution-reporting-api
URL: https://wicg.github.io/attribution-reporting-api
Editor: Charlie Harrison, Google Inc. https://google.com, csharrison@chromium.org
Editor: John Delaney, Google Inc. https://google.com, johnidel@chromium.org
Editor: Andrew Paseltiner, Google Inc. https://google.com, apaseltiner@chromium.org
Abstract: An API to report that an event may have been caused by another cross-site event. These reports are designed to transfer little enough data between sites that the sites can't use them to track individual users.
Markup Shorthands: markdown on
Complain About: accidental-2119 on, missing-example-ids on
Assume Explicit For: on
</pre>
<pre class=link-defaults>
spec:html; type:element; text:a
spec:html; type:element; text:script
spec:html; type:dfn; text:feature separators
spec:html; type:dfn; text:follow the hyperlink
spec:html; type:dfn; text:navigation params
spec:html; type:dfn; text:prepare the script element
spec:html; type:dfn; text:script fetch options
spec:html; type:dfn; text:set up the classic script request
spec:html; type:dfn; text:set up the module script request
spec:html; type:dfn; text:tokenize the features argument
spec:html; type:dfn; text:update the image data
spec:html; type:dfn; text:window open steps
spec:webdriver; type:dfn; text:error
</pre>
<pre class="anchors">
spec: clear-site-data; type: dfn; urlPrefix: https://w3c.github.io/webappsec-clear-site-data/
text: clear DOM-accessible storage for origin; url: #abstract-opdef-clear-dom-accessible-storage-for-origin
spec: hr-time; type: dfn; urlPrefix: https://w3c.github.io/hr-time/
text: current wall time; url: #dfn-current-wall-time
text: duration; url: #dfn-duration
text: moment; url: #dfn-moment
spec: idl; type: dfn; urlPrefix: https://webidl.spec.whatwg.org/
text: throw; url: #dfn-throw
spec: webdriver; urlPrefix: https://w3c.github.io/webdriver/
type: dfn
text: getting a property; url: dfn-getting-properties
text: error code; url: dfn-error-code
text: remote end steps; url: dfn-remote-end-steps
spec: uuid; type: dfn; urlPrefix: https://wicg.github.io/uuid/
text: generate a random UUID; url: #dfn-generate-a-random-uuid
spec: structured header; type: dfn; urlPrefix: https://httpwg.org/specs/rfc8941;
text: structured header; url: #introduction
for: structured header
text: define new structured fields; url: #specify
text: dictionary; url: #dictionary
text: item; url: #item
text: parameter; url: #param
text: parse structured fields; url: #text-parse
text: token; url: #token
spec: infra; type: dfn; urlPrefix: https://infra.spec.whatwg.org/
text: starts with; url: #string-starts-with
spec: fenced-frame; type: dfn; urlPrefix: https://wicg.github.io/fenced-frame/;
for: navigable
text: top-level traversable; url: #navigable-top-level-traversable
for: fenced navigable container
text: fenced navigable; url:#fenced-navigable-container-fenced-navigable
spec: multipage; type: dfn; urlPrefix: https://html.spec.whatwg.org/multipage/;
for: scheme and host
text: host; url: #concept-scheme-and-host-host
</pre>
<pre class=biblio>
{
"chan": {
"title": "Channel capacity",
"href": "https://en.wikipedia.org/wiki/Channel_capacity"
},
"dp": {
"title": "Differential privacy",
"href": "https://en.wikipedia.org/wiki/Differential_privacy"
},
"rr": {
"title": "Randomized response",
"href": "https://en.wikipedia.org/wiki/Randomized_response"
},
"bin-ent": {
"title": "Binary entropy function",
"href": "https://en.wikipedia.org/wiki/Binary_entropy_function"
},
"q-sc": {
"authors": [
"Claudio Weidmann",
"Gottfried Lechner"
],
"title": "q-ary symmetric channel",
"href": "https://arxiv.org/pdf/0909.2009.pdf"
}
}
</pre>
Introduction {#intro}
=====================
<em>This section is non-normative</em>
This specification describes how web browsers can provide a mechanism to the
web that supports measuring and attributing conversions (e.g. purchases) to ads
a user interacted with on another site. This mechanism should remove one need
for cross-site identifiers like third-party cookies.
## Overview ## {#overview}
Pages/embedded sites are given the ability to register [=attribution sources=] and
[=attribution triggers=], which can be linked by the User Agent to generate and
send [=attribution reports=] containing information from both of those events.
A reporter `https://reporter.example` embedded on `https://source.example` is able to
measure whether an interaction on the page lead to an action on `https://destination.example`
by registering an [=attribution source=] with [=attribution source/attribution destinations=]
of « `https://destination.example` ». Reporters are able to register sources through a variety
of surfaces, but ultimately the reporter is required to provide the User Agent with an
HTTP-response header which allows the source to be eligible for attribution.
At a later point in time, the reporter, now embedded on `https://destination.example`,
may register an [=attribution trigger=]. Reporters can register triggers by sending an
HTTP-response header containing information about the action/event that occurred. Internally,
the User Agent attempts to match the trigger to previously registered source events based on
where the sources/triggers were registered and configurations provided by the reporter.
If the User Agent is able to attribute the trigger to a source, it will generate and
send an [=attribution report=] to the reporter via an HTTP POST request at a later point
in time.
# HTML monkeypatches # {#html-monkeypatches}
<h3 id="monkeypatch-attributionsrc">API for elements</h3>
<pre class="idl">
interface mixin HTMLAttributionSrcElementUtils {
[CEReactions, SecureContext] attribute USVString attributionSrc;
};
HTMLAnchorElement includes HTMLAttributionSrcElementUtils;
HTMLImageElement includes HTMLAttributionSrcElementUtils;
HTMLScriptElement includes HTMLAttributionSrcElementUtils;
</pre>
Add the following <a spec=html>content attributes</a>:
: <{a}>
:: <dfn for="a" element-attr>attributionsrc</dfn> - A [=string=] containing
zero or more [=URLs=] to which a background attributionsrc request will be
made when the <{a}> is navigated.
: <{img}>
:: <dfn for="img" element-attr>attributionsrc</dfn> - A [=string=] containing
zero or more [=URLs=] to which a background attributionsrc request will be
made when set.
: <{script}>
:: <dfn for="script" element-attr>attributionsrc</dfn> - A [=string=] containing
zero or more [=URLs=] to which a background attributionsrc request will be
made when set.
The IDL attribute {{HTMLAttributionSrcElementUtils/attributionSrc}}
must <a spec=html>reflect</a> the respective content attribute of the same
name.
Whenever an <{img}> or a <{script}> |element| is created or |element|'s
{{HTMLAttributionSrcElementUtils/attributionSrc}} attribute is set or changed,
run [=make background attributionsrc requests=] with |element| and
"<code>[=eligibility/event-source-or-trigger=]</code>" and the current state of
|element|'s <{img/referrerpolicy}> content attribute or
<{script/referrerpolicy}> content attribute.
Issue: More precisely specify which mutations are relevant for the
attributionsrc attribute.
Modify [=update the image data=] as follows:
After the step
> Set |request|'s [=request/priority=] to the current state...
add the step
1. If the element has an <{img/attributionsrc}> attribute, set
|request|'s [=request/Attribution Reporting Eligibility=] to
"<code>[=eligibility/event-source-or-trigger=]</code>".
A [=script fetch options=] has an associated <dfn for="script fetch options">
Attribution Reporting eligibility</dfn> (an [=eligibility=]). Unless otherwise
stated it is "<code>[=eligibility/unset=]</code>".
Modify [=prepare the script element=] as follows:
After the step
> Let <var ignore=''>fetch priority</var> be the current state of |el|'s <{script/fetchpriority}>
> content attribute.
add the step
1. Let |Attribution Reporting eligibility| be
"<code>[=eligibility/event-source-or-trigger=]</code>" if |el| has an
<{script/attributionsrc}> content attribute and
"<code>[=eligibility/unset=]</code>" otherwise.
Add "and [=script fetch options/Attribution Reporting eligibility=] is
|Attribution Reporting eligibility|." to the step
> Let <var ignore=''>options</var> be a [=script fetch options=] whose...
Modify [=set up the classic script request=] and
[=set up the module script request=] as follows:
Add "and its [=request/Attribution Reporting eligibility=] is |options|'s
[=script fetch options/Attribution Reporting eligibility=]."
Modify [=follow the hyperlink=] as follows:
After the step
> If |subject|'s link types includes...
add the steps
1. Let |navigationSourceEligible| be false.
1. If |subject| has an `attributionsrc` attribute:
1. Set |navigationSourceEligible| to true.
1. [=Make background attributionsrc requests=] with |subject| and
"<code>[=eligibility/navigation-source=]</code>", and |referrerPolicy|.
Add "and [=navigate/navigationSourceEligible=] set to
|navigationSourceEligible|" to the step
> [=Navigate=] <var ignore=''>targetNavigable</var>...
<h3 id="monkeypatch-window-open">Window open steps</h4>
Modify the [=tokenize the features argument=] as follows:
Replace the step
> [=Collect a sequence of code points=] that are not [=feature separators=] code
> points from |features| given |position|. Set |value| to the collected code
> points, [=ASCII lowercase|converted to ASCII lowercase=].
with
[=Collect a sequence of code points=] that are not [=feature separators=] code
points from |features| given |position|. Set |value| to the collected code
points, [=ASCII lowercase|converted to ASCII lowercase=]. Set
|originalCaseValue| to the collected code points.
Replace the step
> If |name| is not the empty string, then set |tokenizedFeatures|[|name|] to
> |value|.
with the steps
1. If |name| is not the empty string:
1. Switch on |name|:
<dl class="switch">
: "`attributionsrc`"
:: Run the following steps:
1. If |tokenizedFeatures|[|name|] does not [=map/exists|exist=],
[=map/set=] |tokenizedFeatures|[|name|] to a new [=list=].
1. [=list/Append=] |originalCaseValue| to |tokenizedFeatures|[|name|].
: Anything else
:: [=map/Set=] |tokenizedFeatures|[|name|] to |value|.
</dl>
Modify the [=window open steps=] as follows:
After the step
> Let |tokenizedFeatures| be the result of
> [=tokenize the features argument|tokenizing=] |features|.
add the steps
1. Let |navigationSourceEligible| be false.
1. If |tokenizedFeatures|["`attributionsrc`"] [=map/exists=]:
1. [=Assert=]: |tokenizedFeatures|["`attributionsrc`"] is a [=list=].
1. Set |navigationSourceEligible| to true.
1. Set |attributionSrcUrls| to a new [=list=].
1. [=list/iterate|For each=] |value| of
|tokenizedFeatures|["`attributionsrc`"]:
1. If |value| is the empty string, [=iteration/continue=].
1. Let |decodedSrcBytes| be the result of
[=string/percent-decode|percent-decoding=] |value|.
1. Let |decodedSrc| be the [=UTF-8 decode without BOM=] of
|decodedSrcBytes|.
1. <a spec="HTML" lt="parse a URL">Parse</a> |decodedSrc| relative to
the <a spec="HTML" lt="entry settings object">entry settings object</a>,
and set |urlRecord| to the resulting [=URL record=], if any. If
parsing failed, [=iteration/continue=].
1. [=list/Append=] |urlRecord| to |attributionSrcUrls|.
Issue: Use |attributionSrcUrls| and |referrerPolicy| with
[=make a background attributionsrc request=].
In each step that calls [=navigate=], set [=navigate/navigationSourceEligible=]
to |navigationSourceEligible|.
## Navigation monkeypatches ## {#navigation-monkeypatches}
Add the following item to [=navigation params=]:
: <dfn for="navigation params">navigationSourceEligible</dfn>
:: A boolean indicating whether the navigation can register a
[=source type/navigation=] [=attribution source|source=] in its response.
Defaults to false.
Modify [=navigate=] as follows:
Add an optional boolean parameter called <dfn for="navigate">
<var>navigationSourceEligible</var></dfn> (default false).
In the step
> Set <var ignore=''>navigationParams</var> to a new [=navigation params=]
> with...
add the property
: [=navigation params/navigationSourceEligible=]
:: |navigationSourceEligible|
Issue: Use/propagate [=navigation params/navigationSourceEligible=] to the
[=navigation request=]'s [=request/Attribution Reporting eligibility=].
Issue: Enforce [attribution-scope privacy limits](#attribution-scope).
# Network monkeypatches # {#network-monkeypatches}
<pre class="idl">
dictionary AttributionReportingRequestOptions {
required boolean eventSourceEligible;
required boolean triggerEligible;
};
partial dictionary RequestInit {
AttributionReportingRequestOptions attributionReporting;
};
partial interface XMLHttpRequest {
[SecureContext]
undefined setAttributionReporting(AttributionReportingRequestOptions options);
};
</pre>
A [=request=] has an associated
<dfn export for=request>Attribution Reporting eligibility</dfn> (an [=eligibility=]).
Unless otherwise stated it is "<code>[=eligibility/unset=]</code>".
To <dfn>get an eligibility from {{AttributionReportingRequestOptions}}</dfn>
given an {{AttributionReportingRequestOptions}} |options|:
1. Let |eventSourceEligible| be |options|'s
{{AttributionReportingRequestOptions/eventSourceEligible}}.
1. Let |triggerEligible| be |options|'s
{{AttributionReportingRequestOptions/triggerEligible}}.
1. If (|eventSourceEligible|, |triggerEligible|) is:
<dl class="switch">
: (false, false)
:: Return "<code>[=eligibility/empty=]</code>".
: (false, true)
:: Return "<code>[=eligibility/trigger=]</code>".
: (true, false)
:: Return "<code>[=eligibility/event-source=]</code>".
: (true, true)
:: Return "<code>[=eligibility/event-source-or-trigger=]</code>".
</dl>
Issue: Check permissions policy.
"<code><dfn>Attribution-Reporting-Eligible</dfn></code>" is a
[=structured header/dictionary|Dictionary Structured Header=]
set on a [=request=] that indicates which registrations, if
any, are allowed on the corresponding [=response=]. Its values are not specified
and its <dfn lt="eligible key">allowed keys</dfn> are:
<dl dfn-for="eligible key">
: "<dfn><code>event-source</code></dfn>"
:: An [=source type/event=] [=attribution source|source=] may be registered.
: "<dfn><code>navigation-source</code></dfn>"
:: A [=source type/navigation=] [=attribution source|source=] may be registered.
: "<dfn><code>trigger</code></dfn>"
:: A [=attribution trigger|trigger=] may be registered.
</dl>
"<code><dfn>Attribution-Reporting-Support</dfn></code>" is a
[=structured header/dictionary|Dictionary Structured Header=]
set on a [=request=] that indicates which registrars, if
any, the corresponding [=response=] can use. Its values are not specified and
its allowed keys are the [=registrars=].
To <dfn>obtain a dictionary structured header value</dfn> given a [=list=] of [=strings=] |keys| and
a [=set=] of [=strings=] |allowedKeys|:
1. [=set/iterate|For each=] |key| of |allowedKeys|, optionally [=list/append=] the
[=string/concatenation=] of « "`not-`", |key| » to |keys|.
1. Optionally, [=shuffle a list|shuffle=] |keys|.
1. Let |entries| be a new [=list=].
1. [=list/iterate|For each=] |key| of |keys|:
1. Let |value| be true.
1. Optionally, set |value| to a [=structured header/token=]
corresponding to one of [=strings=] in |allowedKeys|.
1. Let |params| be a new [=map=].
1. [=set/iterate|For each=] |key| of |allowedKeys|, optionally [=map/set=] |params|[|key|] to an
arbitrary [=structured header/item|bare item=].
1. [=list/Append=] a structured dictionary member with the key |key|, the
value |value|, and the parameters |params| to |entries|.
1. Return a [=structured header/dictionary=] containing |entries|.
Note: The user agent MAY "[=structured header/define new structured fields|grease=]" the
dictionary structured headers according to the preceding algorithm to help ensure that recipients
use a proper structured header parser, rather than naive string equality or
`contains` operations, which makes it easier to introduce backwards-compatible
changes to the header definition in the future. Including the allowed keys
as dictionary *values* or *parameters* helps ensure that only the dictionary's
keys are interpreted by the recipient. Likewise, shuffling the dictionary
members helps ensure that, e.g., "`key1, key2`" is treated equivalently to "`key2, key1`".
In the following example, only the "`trigger`" key should be interpreted by the
recipient after the header has been parsed as a structured dictionary:
<pre class="example" heading="Greased Attribution-Reporting-Eligible header">
Attribution-Reporting-Eligible: not-event-source, trigger=event-source;navigation-source=3
</pre>
In the following example, only the "`os`" key should be interpreted by the
recipient after the header has been parsed as a structured dictionary:
<pre class="example" heading="Greased Attribution-Reporting-Support header">
Attribution-Reporting-Support: os=web
</pre>
To <dfn>set Attribution Reporting headers</dfn> given a [=request=] |request|:
1. Let |headers| be |request|'s [=request/header list=].
1. Let |eligibility| be |request|'s [=request/Attribution Reporting eligibility=].
1. [=header list/Delete=] "<code>[=Attribution-Reporting-Eligible=]</code>" from
|headers|.
1. [=header list/Delete=] "<code>[=Attribution-Reporting-Support=]</code>" from
|headers|.
1. If |eligibility| is "<code>[=eligibility/unset=]</code>", return.
1. Let |keys| be a new [=list=].
1. If |eligibility| is:
<dl class="switch">
: "<code>[=eligibility/empty=]</code>"
:: Do nothing.
: "<code>[=eligibility/event-source=]</code>"
:: [=list/Append=] "<code>[=eligible key/event-source=]</code>" to |keys|.
: "<code>[=eligibility/navigation-source=]</code>"
:: [=list/Append=] "<code>[=eligible key/navigation-source=]</code>" to
|keys|.
: "<code>[=eligibility/trigger=]</code>"
:: [=list/Append=] "<code>[=eligible key/trigger=]</code>" to |keys|.
: "<code>[=eligibility/event-source-or-trigger=]</code>"
:: [=list/Append=] "<code>[=eligible key/event-source=]</code>" and
"<code>[=eligible key/trigger=]</code>" to |keys|.
1. Let |supportedRegistrars| be the result of [=getting supported registrars=].
1. If |supportedRegistrars| [=list/is empty=], [=list/empty|clear=] |keys|.
1. Let |eligibleDict| be the result of [=obtaining a dictionary structured header value=] with
|keys| and the [=set=] containing all the [=eligible keys=].
1. [=header list/Set a structured field value=] given
("<code>[=Attribution-Reporting-Eligible=]</code>", |eligibleDict|) in |headers|.
1. Let |supportDict| be the result of [=obtaining a dictionary structured header value=]
with |supportedRegistrars| and the [=set=] containing all the [=registrars=].
1. [=header list/Set a structured field value=] given
("<code>[=Attribution-Reporting-Support=]</code>", |supportDict|) in |headers|.
<h3 id="monkeypatch-fetch">Fetch monkeypatches</h4>
Modify [=fetch=] as follows:
After the step
> If |request|'s [=request/header list=] does not contain `Accept`...
add the step
1. [=Set Attribution Reporting headers=] with |request|.
Modify {{Request/constructor(input, init)}} as follows:
In the step
> Set |request| to a new [=request=] with the following properties:
add the property
: [=request/Attribution Reporting eligibility=]
:: |request|'s [=request/Attribution Reporting eligibility=].
After the step
> If |init|["`priority`"] [=map/exists=], then:
add the step
1. If |init|["{{RequestInit/attributionReporting}}"] [=map/exists=], then set
|request|'s [=request/Attribution Reporting eligibility=] to the result of
[=get an eligibility from AttributionReportingRequestOptions=] with it.
<h3 id="monkeypatch-xmlhttprequest">XMLHttpRequest monkeypatches</h4>
An {{XMLHttpRequest}} object has an associated
<dfn id="xmlhttprequest-eligibility">Attribution Reporting eligibility</dfn> (an
[=eligibility=]). Unless otherwise stated it is
"<code>[=eligibility/unset=]</code>".
The {{XMLHttpRequest/setAttributionReporting(options)}} method must run these
steps:
1. If <a>this</a>'s
<a href="https://xhr.spec.whatwg.org/#concept-xmlhttprequest-state">state</a>
is not <i>opened</i>, then [=throw=] an
"{{InvalidStateError!!exception}}" {{DOMException}}.
1. If <a>this</a>'s
<a href="https://xhr.spec.whatwg.org/#send-flag">`send()` flag</a> is set,
then [=throw=] an "{{InvalidStateError!!exception}}" {{DOMException}}.
1. Set <a>this</a>'s <a href=#xmlhttprequest-eligibility>Attribution Reporting
eligibility</a> to the result of
[=get an eligibility from AttributionReportingRequestOptions=] with
|options|.
Modify {{XMLHttpRequest/send(body)}} as follows:
Add a [=Document=] parameter called |document|.
After the step:
> Let |req| be a new [=request=], initialized as follows...
Add the step:
1. Set |req|'s [=request/Attribution Reporting eligibility=] to <a>this</a>'s <a href=#xmlhttprequest-eligibility>Attribution Reporting
eligibility</a>.
1. [=Set Attribution Reporting headers=] with |req| and |document|'s [=node/context origin=].
# Permissions Policy integration # {#permission-policy-integration}
This specification defines a [=policy-controlled feature=] identified by the string "<code><dfn export for="PermissionPolicy" enum-value>attribution-reporting</dfn></code>".
Its [=policy-controlled feature/default allowlist=] is <a href="https://w3c.github.io/webappsec-permissions-policy/#default-allowlist">`*`</a>.
# Clear Site Data integration # {#clear-site-data-integration}
In [=clear DOM-accessible storage for origin=], add the following step:
> 7. Run [=clear site data=] with |origin|.
To <dfn>clear site data</dfn> given an [=origin=] |origin|:
1. [=set/iterate|For each=] [=attribution source=] |source| of the [=attribution source cache=]:
1. If |source|'s [=attribution source/reporting origin=] and |origin| are [=same origin=],
[=set/remove=] |source| from the [=attribution source cache=].
1. [=set/iterate|For each=] [=event-level report=] |report| of the [=event-level report cache=]:
1. If |report|'s [=event-level report/reporting origin=] and |origin| are [=same origin=],
[=set/remove=] |report| from the [=event-level report cache=].
1. [=set/iterate|For each=] [=aggregatable attribution report=] |report| of the [=aggregatable attribution report cache=]:
1. If |report|'s [=aggregatable attribution report/reporting origin=] and |origin| are [=same origin=],
[=set/remove=] |report| from the [=aggregatable attribution report cache=].
Note: We deliberately do *not* remove matching entries from the
[=attribution rate-limit cache=] and [=aggregatable debug rate-limit cache=], as doing so would allow a site to reset and
therefore exceed the intended rate limits at will.
# Structures # {#structures}
<h3 dfn-type=dfn>Registration info</h3>
A registration info is a [=struct=] with the following items:
<dl dfn-for="registration info">
: <dfn>preferred platform</dfn> (default null)
:: Null or a [=registrar=].
: <dfn>report header errors</dfn> (default false)
:: A [=boolean=].
</dl>
<h3 dfn-type=dfn>Trigger state</h3>
A trigger state is a [=struct=] with the following items:
<dl dfn-for="trigger state">
: <dfn>trigger data</dfn>
:: A non-negative 64-bit integer.
: <dfn>report window</dfn>
:: A [=report window=].
</dl>
<h3 dfn-type=dfn>Randomized response output configuration</h3>
A randomized response output configuration is a [=struct=] with the following items:
<dl dfn-for="randomized response output configuration">
: <dfn>max attributions per source</dfn>
:: A positive integer.
: <dfn>trigger specs</dfn>
:: A [=trigger spec map=].
</dl>
<h3 dfn-type=dfn>Randomized source response</h3>
A randomized source response is null or a [=list=] of [=trigger states=].
<h3 id="attribution-filtering">Attribution filtering</h3>
A <dfn>filter value</dfn> is a [=set=] of [=strings=].
A <dfn>filter map</dfn> is a [=map=] whose [=map/key|keys=] are [=strings=] and whose
[=map/value|values=] are [=filter values=].
A <dfn>filter config</dfn> is a [=struct=] with the following items:
<dl dfn-for="filter config">
: <dfn>map</dfn>
:: A [=filter map=].
: <dfn>lookback window</dfn>
:: Null or a positive [=duration=].
</dl>
<h3 dfn-type=dfn>Suitable origin</h3>
A suitable origin is an [=origin=] that is [=check if an origin is suitable|suitable=].
<h3 id="source-type-header">Source type</h3>
A <dfn>source type</dfn> is one of the following:
<dl dfn-for="source type">
: "<dfn><code>navigation</code></dfn>"
:: The source was associated with a top-level navigation.
: "<dfn><code>event</code></dfn>"
:: The source was not associated with a top-level navigation.
</dl>
<h3 id="report-window-header">Report window</h3>
A <dfn>report window</dfn> is a [=struct=] with the following items:
<dl dfn-for="report window">
: <dfn>start</dfn>
:: A [=moment=].
: <dfn>end</dfn>
:: A [=moment=], strictly greater than [=report window/start=].
</dl>
A <dfn>report window list</dfn> is a [=list=] of [=report windows=].
It has the following constraints:
* Elements are in ascending order based on their [=report window/start=].
* Every element's [=report window/start=] is equal to the previous element's [=report window/end=], if it exists.
* There is at least one element in the list.
A [=report window list=] |list|'s <dfn for="report window list">total window</dfn> is
a [=report window=] [=struct=] with the following fields:
: [=report window/start=]
:: The [=report window/start=] of |list|[0].
: [=report window/end=]
:: The [=report window/end=] of |list|[|list|'s [=list/size=] - 1].
Note: The [=report window list/total window=] is conceptually a union of
[=report windows=], because there are no gaps in time between any of the
[=report windows|windows=].
<h3 id="summary-operator-header">Summary operator</h3>
A <dfn>summary operator</dfn> summarizes the triggers attributed to an
[=attribution source=]. Its value is one of the following:
<dl dfn-for="summary operator">
: "<dfn><code>count</code></dfn>"
:: Number of triggers attributed.
: "<dfn><code>value_sum</code></dfn>"
:: Sum of the value of triggers.
</dl>
<h3 id="summary-bucket-header">Summary bucket</h3>
A <dfn>summary bucket</dfn> is a [=struct=] with the following items:
<dl dfn-for="summary bucket">
: <dfn>start</dfn>
:: An unsigned 32-bit integer.
: <dfn>end</dfn>
:: An unsigned 32-bit integer.
</dl>
A <dfn>summary bucket list</dfn> is a [=list=] of [=summary buckets=].
It has the following constraints:
* Elements are strictly in ascending order based on their [=summary bucket/start=].
* Every element's [=summary bucket/end=] is equal to the next element's [=summary bucket/start=] - 1, if it exists.
* There is at least one element in the list.
<h3 id="trigger-data-matching-mode-header">Trigger-data matching mode</h3>
A <dfn>trigger-data matching mode</dfn> is one of the following:
<dl dfn-for="trigger-data matching mode">
: "<dfn><code>exact</code></dfn>"
:: [=event-level trigger configuration/Trigger data=] must be less than the
[=default trigger data cardinality=]. Otherwise, no event-level attribution
takes place.
: "<dfn><code>modulus</code></dfn>"
:: [=event-level trigger configuration/Trigger data=] is taken modulo the
[=default trigger data cardinality=].
</dl>
<h3 id="trigger-specs-header">Trigger specs</h3>
A <dfn>trigger spec</dfn> is a [=struct=] with the following items:
<dl dfn-for="trigger spec">
: <dfn>event-level report windows</dfn>
:: A [=report window list=].
</dl>
A <dfn>trigger spec map</dfn> is a [=map=] whose keys are unsigned 32-bit
integers and values are [=trigger specs=].
To <dfn>find a matching trigger spec</dfn> given an [=attribution source=]
|source| and an unsigned 64-bit integer |triggerData|:
1. Let |specs| be |source|'s [=attribution source/trigger specs=].
1. If |source|'s [=attribution source/trigger-data matching mode=] is:
<dl class="switch">
: "<code>[=trigger-data matching mode/exact=]</code>"
:: Run the following steps:
1. If |specs|[|triggerData|] [=map/exists=], return its [=map/entry=].
1. Return an error.
: "<code>[=trigger-data matching mode/modulus=]</code>"
:: Run the following steps:
1. If |specs| [=map/is empty=], return an error.
1. Let |keys| be |specs|'s [=map/get the keys|keys=].
1. Let |index| be the remainder when dividing |triggerData| by |keys|'s
[=set/size=].
1. Return the [=map/entry=] for |specs|[|keys|[|index|]].
</dl>
<h3 dfn-type=dfn>Aggregatable debug reporting config</h3>
An aggregatable debug reporting config is a [=struct=] with the following items:
<dl dfn-for="aggregatable debug reporting config">
: <dfn>key piece</dfn> (default 0)
:: A non-negative 128-bit integer.
: <dfn>debug data</dfn> (default an [=map/is empty|empty=] [=map=])
:: A [=map=] whose [=map/keys=] are [=debug data types=] and whose [=map/values=]
are [=aggregatable contributions=].
: <dfn>aggregation coordinator</dfn> (default [=default aggregation coordinator=])
:: An [=aggregation coordinator=].
</dl>
<h3 dfn-type=dfn>Attribution scopes</h3>
An attribution scopes is a [=struct=] with the following items:
<dl dfn-for="attribution scopes">
: <dfn>limit</dfn>
:: A positive 32-bit integer representing the number of distinct [=attribution scopes/values=] allowed per [=attribution source/attribution destinations|attribution destination=] for the source's [=attribution source/reporting origin=].
: <dfn>values</dfn>
:: A [=set=] of [=strings=].
: <dfn>max event states</dfn>
:: A positive integer representing the maximum number of [=trigger states=] for [=source type/event=] sources per [=attribution source/attribution destinations|attribution destination=] for the source's [=attribution source/reporting origin=].
</dl>
<h3 dfn-type=dfn>Attribution source</h3>
An attribution source is a [=struct=] with the following items:
<dl dfn-for="attribution source">
: <dfn>internal ID</dfn>
:: A [=string=].
: <dfn>source origin</dfn>
:: A [=suitable origin=].
: <dfn>event ID</dfn>
:: A non-negative 64-bit integer.
: <dfn>attribution destinations</dfn>
:: A [=set=] of [=sites=].
: <dfn>reporting origin</dfn>
:: A [=suitable origin=].
: <dfn>source type</dfn>
:: A [=source type=].
: <dfn>expiry</dfn>
:: A [=duration=].
: <dfn>trigger specs</dfn>
:: A [=trigger spec map=].
: <dfn>aggregatable report window</dfn>
:: A [=report window=].
: <dfn>priority</dfn>
:: A 64-bit integer.
: <dfn>source time</dfn>
:: A [=moment=].
: <dfn>number of event-level reports</dfn>
:: Number of [=event-level reports=] created for this [=attribution source=].
: <dfn>max number of event-level reports</dfn>
:: The maximum number of [=event-level reports=] that can be created for this [=attribution source=].
: <dfn>event-level attributable</dfn> (default true)
:: A [=boolean=].
: <dfn>dedup keys</dfn>
:: A [=set=] of [=event-level trigger configuration/dedup keys=] associated with this [=attribution source=].
: <dfn>randomized response</dfn> (default null)
:: A [=randomized source response=].
: <dfn>randomized trigger rate</dfn> (default 0)
:: A number between 0 and 1 (both inclusive).
: <dfn>event-level epsilon</dfn>
:: A double.
: <dfn>filter data</dfn>
:: A [=filter map=].
: <dfn>debug key</dfn>
:: Null or a non-negative 64-bit integer.
: <dfn>aggregation keys</dfn>
:: A [=map=] whose [=map/key|keys=] are [=strings=] and whose [=map/value|values=] are
non-negative 128-bit integers.
: <dfn>remaining aggregatable attribution budget</dfn>
:: A non-negative integer.
: <dfn>aggregatable dedup keys</dfn>
:: A [=set=] of [=aggregatable dedup key/dedup key|aggregatable dedup key values=] associated with this [=attribution source=].
: <dfn>debug reporting enabled</dfn>
:: A [=boolean=].
: <dfn>number of aggregatable attribution reports</dfn>
:: Number of [=aggregatable attribution reports=] created for this [=attribution source=].
: <dfn>trigger-data matching mode</dfn>
:: A [=trigger-data matching mode=].
: <dfn>debug cookie set</dfn> (default false)
:: A [=boolean=].
: <dfn>fenced</dfn>
:: A [=boolean=].
: <dfn>remaining aggregatable debug budget</dfn>
:: A non-negative integer.
: <dfn>number of aggregatable debug reports</dfn>
:: Number of [=aggregatable debug reports=] created for this [=attribution source=].
: <dfn>aggregatable debug reporting config</dfn>
:: An [=aggregatable debug reporting config=].
: <dfn>destination limit priority</dfn>
:: A 64-bit integer.
: <dfn>attribution scopes</dfn> (default null)
:: Null or an [=attribution scopes=].
</dl>
An [=attribution source=] |source|'s <dfn for="attribution source">expiry time</dfn> is |source|'s [=attribution source/source time=] + |source|'s [=attribution source/expiry=].
An [=attribution source=] |source|'s <dfn for="attribution source">source site</dfn> is the result
of [=obtain a site|obtaining a site=] from |source|'s [=attribution source/source origin=].
<h3 dfn-type=dfn>Aggregatable trigger data</h3>
An aggregatable trigger data is a [=struct=] with the following items:
<dl dfn-for="aggregatable trigger data">
: <dfn>key piece</dfn>
:: A non-negative 128-bit integer.
: <dfn>source keys</dfn>
:: A [=set=] of [=strings=].
: <dfn>filters</dfn>
:: A [=list=] of [=filter configs=].
: <dfn>negated filters</dfn>
:: A [=list=] of [=filter configs=].
</dl>
<h3 dfn-type=dfn>Aggregatable values configuration</h3>
An <dfn>aggregatable key value</dfn> is a [=struct=] with the following items:
<dl dfn-for="aggregatable key value">
: <dfn>value</dfn>
:: A non-negative 32-bit integer.
: <dfn>filtering ID</dfn>
:: A non-negative integer.
</dl>
An aggregatable values configuration is a [=struct=] with the following items:
<dl dfn-for="aggregatable values configuration">
: <dfn>values</dfn>
:: A [=map=] whose [=map/key|keys=] are [=strings=] and whose [=map/value|values=] are [=aggregatable key values=].
: <dfn>filters</dfn>
:: A [=list=] of [=filter configs=].
: <dfn>negated filters</dfn>
:: A [=list=] of [=filter configs=].
</dl>
<h3 dfn-type=dfn>Aggregatable dedup key</h3>
An aggregatable dedup key is a [=struct=] with the following items:
<dl dfn-for="aggregatable dedup key">
: <dfn>dedup key</dfn>
:: Null or a non-negative 64-bit integer.
: <dfn>filters</dfn>
:: A [=list=] of [=filter configs=].
: <dfn>negated filters</dfn>
:: A [=list=] of [=filter configs=].
</dl>
<h3 dfn-type=dfn>Event-level trigger configuration</h3>
An event-level trigger configuration is a [=struct=] with the following items:
<dl dfn-for="event-level trigger configuration">
: <dfn>trigger data</dfn>
:: A non-negative 64-bit integer.
: <dfn>dedup key</dfn>
:: Null or a non-negative 64-bit integer.
: <dfn>priority</dfn>
:: A 64-bit integer.
: <dfn>filters</dfn>
:: A [=list=] of [=filter configs=].
: <dfn>negated filters</dfn>
:: A [=list=] of [=filter configs=].
: <dfn>value</dfn>
:: A positive unsigned 32-bit integer.
</dl>
<h3 id="aggregation-coordinator-header">Aggregation coordinator</h3>
An <dfn>aggregation coordinator</dfn> is one of a user-agent-determined [=set=]
of [=suitable origins=] that specifies which aggregation service deployment to use.
<h3 id="aggregatable-source-registration-time-configuration-header">Aggregatable source registration time configuration</h3>
An <dfn>aggregatable source registration time configuration</dfn> is one of the following:
<dl dfn-for="aggregatable source registration time configuration">
: "<dfn><code>exclude</code></dfn>"
:: "`source_registration_time`" is excluded from an [=aggregatable attribution report=]'s [=aggregatable attribution report/shared info=].
: "<dfn><code>include</code></dfn>"
:: "`source_registration_time`" is included in an [=aggregatable attribution report=]'s [=aggregatable attribution report/shared info=].
</dl>
<h3 dfn-type=dfn>Attribution trigger</h3>
An attribution trigger is a [=struct=] with the following items:
<dl dfn-for="attribution trigger">
: <dfn>attribution destination</dfn>
:: A [=site=].
: <dfn>trigger time</dfn>
:: A [=moment=].
: <dfn>reporting origin</dfn>
:: A [=suitable origin=].
: <dfn>filters</dfn>
:: A [=list=] of [=filter configs=].
: <dfn>negated filters</dfn>
:: A [=list=] of [=filter configs=].
: <dfn>debug key</dfn>
:: Null or a non-negative 64-bit integer.
: <dfn>event-level trigger configurations</dfn>
:: A [=set=] of [=event-level trigger configuration=].
: <dfn>aggregatable trigger data</dfn>
:: A [=list=] of [=aggregatable trigger data=].
: <dfn>aggregatable values configurations</dfn>
:: A [=list=] of [=aggregatable values configuration=].
: <dfn>aggregatable dedup keys</dfn>
:: A [=list=] of [=aggregatable dedup key=].
: <dfn>debug reporting enabled</dfn>
:: A [=boolean=].
: <dfn>aggregation coordinator</dfn>
:: An [=aggregation coordinator=].
: <dfn>aggregatable source registration time configuration</dfn>
:: An [=aggregatable source registration time configuration=].
: <dfn>trigger context ID</dfn>
:: Null or a [=string=].
: <dfn>fenced</dfn>
:: A [=boolean=].
: <dfn>aggregatable filtering ID max bytes</dfn>
:: A positive integer.
: <dfn>aggregatable debug reporting config</dfn>
:: An [=aggregatable debug reporting config=].
: <dfn>attribution scopes</dfn>
:: A [=set=] of [=strings=].
</dl>