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<p>
<a href="http://www.w3.org/"><img alt="W3C" src="http://www.w3.org/Icons/w3c_home" height="48" width="72"></a>
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<h1>Performance Timeline</h1>

<h2 class="no-num no-toc" id="working-draft-september-1-2011">W3C Working Draft 1 September 2011</h2>
<dl>
  <dt>This version:</dt>
    <dd><a
      href="http://www.w3.org/TR/2011/WD-performance-timeline-20110901/">http://www.w3.org/TR/2011/WD-performance-timeline-20110901/</a></dd>
  <dt>Latest version:</dt>
    <dd><a
      href="http://www.w3.org/TR/performance-timeline/">http://www.w3.org/TR/performance-timeline/</a></dd>
  <dt>Latest Editor's Draft:</dt>
    <dd><a
      href="http://dvcs.w3.org/hg/webperf/raw-file/tip/specs/PerformanceTimeline/Overview.html">http://dvcs.w3.org/hg/webperf/raw-file/tip/specs/PerformanceTimeline/Overview.html</a></dd>
  <dt>Previous version:</dt>
    <dd><a
      href="http://www.w3.org/TR/2011/WD-performance-timeline-20110811/">http://www.w3.org/TR/2011/WD-performance-timeline-20110811/</a></dd>
  <dt>Editors:</dt>
    <dd class="vcard"><span class="fn">Jatinder Mann</span> (<span
      class="org">Microsoft Corp.</span>) &lt;<a
      class="email" href="mailto:jmann@microsoft.com">jmann@microsoft.com</a>&gt; </dd>
    <dd class="vcard"><span class="fn">Zhiheng Wang</span> (<span
      class="org">Google Inc.</span>) &lt;<a
      class="email" href="mailto:zhihengw@google.com">zhihengw@google.com</a>&gt; </dd>
</dl>

   <p class=copyright><a
    href="http://www.w3.org/Consortium/Legal/ipr-notice#Copyright">Copyright</a>
    &copy; 2011 <a href="http://www.w3.org/"><acronym title="World Wide Web
    Consortium">W3C</acronym></a><sup>&reg;</sup> (<a
    href="http://www.csail.mit.edu/"><acronym title="Massachusetts Institute
    of Technology">MIT</acronym></a>, <a
    href="http://www.ercim.eu/"><acronym title="European Research Consortium
    for Informatics and Mathematics">ERCIM</acronym></a>, <a
    href="http://www.keio.ac.jp/">Keio</a>), All Rights Reserved. W3C <a
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<h2 class="no-num no-toc" id="abstract">Abstract</h2>

<p>This specification defines an interface for web applications to access
timing information related to navigation and elements. </p>

<h2 class="no-num no-toc" id="status-of-this-document">Status of this
document</h2>

  <p><em>This section describes the status of this document at the time of
   its publication. Other documents may supersede this document. A list of
   current W3C publications and the latest revision of this technical report
   can be found in the <a href="http://www.w3.org/TR/">W3C technical reports
   index</a> at http://www.w3.org/TR/.</em></p>

<p>This is a <strong>Last Call</strong> Working Draft of "Performance Timeline".</p>

<p>Please send comments
   to <a href="mailto:public-web-perf@w3.org?subject=[PerformanceTimeline]%20">public-web-perf@w3.org</a>
   (<a href="http://lists.w3.org/Archives/Public/public-web-perf/">archived</a>)
   with <samp>[PerformanceTimeline]</samp> at the start of the subject line by <strong>22 September 2011</strong>.</p>

<p>A <a href='diff.html'>diff document</a> with the previous draft is available.</p>


<p>This document is produced by
   the <a href="http://www.w3.org/2010/webperf/">Web Performance</a>
   Working Group. The Web Performance Working Group is part of
   the <a href="http://www.w3.org/2006/rwc/Activity">Rich Web Clients
   Activity</a> in the
   W3C <a href="http://www.w3.org/Interaction/">Interaction
   Domain</a>.

<p>
<strong>You can find the latest <a href="http://www.w3c-test.org/webperf/specs/PerformanceTimeline/">Editor's Draft</a> of this document in the <a href="https://dvcs.w3.org/hg/webperf/">W3C's Mercurial repository</a>, which is updated on a regular basis.</strong>
</p>


<p>Publication as a Working Draft does not imply endorsement by the
W3C Membership. This is a draft document and may be updated, replaced
or obsoleted by other documents at any time. It is inappropriate to
cite this document as other than work in progress. </p>

<p>This document was produced by a group operating under
   the <a href="http://www.w3.org/Consortium/Patent-Policy-20040205/">5
   February 2004 W3C Patent Policy</a>. W3C maintains
   a <a href="http://www.w3.org/2004/01/pp-impl/45211/status"
   rel="disclosure">public list of any patent disclosures</a> made in
   connection with the deliverables of the group; that page also
   includes instructions for disclosing a patent. An individual who
   has actual knowledge of a patent which the individual believes
   contains <a href="http://www.w3.org/Consortium/Patent-Policy-20040205/#def-essential">Essential
   Claim(s)</a> must disclose the information in accordance
   with <a href="http://www.w3.org/Consortium/Patent-Policy-20040205/#sec-Disclosure">section
   6 of the W3C Patent Policy</a>.</p>

<h2 class="no-num no-toc" id="table-of-contents">Table of Contents</h2>
<!--begin-toc-->
<ol class="toc">
  <li><a href="#introduction"><span class="secno">1
  </span>Introduction</a></li>
  <li><a href="#conformance-requirements"><span class="secno">2
    </span>Conformance requirements</a></li>
  <li><a href="#terminology"><span class="secno">3 </span>Terminology</a></li>
  <li><a href="#sec-navigation-timing"><span class="secno">4 </span>Performance Timeline</a>
    <ol class="toc">
      <li><a href="#sec-performance-timeline"><span class="secno">4.1 </span> The Performance Timeline</a></li>
      <li><a href="#sec-PerformanceEntry-interface"><span class="secno">4.2 </span>The <code>PerformanceEntry</code> interface</a></li>
      <li><a href="#sec-window.performance-attribute"><span class="secno">4.3 </span> The <code>window.performance</code> attribute</a></li>
      <li><a href="#sec-PerformanceTiming"><span class="secno">4.4 </span> The <code>PerformanceTiming</code> interface</a></li>
    </ol>
  </li>
  <li><a href="#references"><span class="secno">5 </span>References</a></li>
  <li><a class="no-num" href="#acknowledgements">Acknowledgements</a></li>
</ol>
<!--end-toc-->


<h2 id="introduction"><span class="secno">1 </span>Introduction</h2>

<p>This section is non-normative.</p>

<p>
This specification introduces a unified interface to store and retrieve performance metric data.
This specification does not cover individual performance metric interfaces.
</p>

<h2 id="conformance-requirements"><span class="secno">2 </span>Conformance
requirements</h2>

<p>All diagrams, examples, and notes in this specification are non-normative,
as are all sections explicitly marked non-normative. Everything else in this
specification is normative. </p>

<p>The key words "MUST", "MUST NOT", "REQUIRED", "SHOULD", "SHOULD NOT",
"RECOMMENDED", "MAY", and "OPTIONAL" in the normative parts of this document
are to be interpreted as described in <a href="#rfc2119">RFC 2119</a>.
For readability, these words do not appear in all uppercase letters in this specification.</p>

<p>Requirements phrased in the imperative as part of algorithms (such as
"strip any leading space characters" or "return false and abort these steps")
are to be interpreted with the meaning of the key word ("must", "should",
"may", etc) used in introducing the algorithm. </p>

<p>Some conformance requirements are phrased as requirements on attributes,
methods or objects. Such requirements are to be interpreted as requirements
on user agents. </p>

<p>Conformance requirements phrased as algorithms or specific steps may be
implemented in any manner, so long as the end result is equivalent. (In
particular, the algorithms defined in this specification are intended to be
easy to follow, and not intended to be performant.) </p>

    <p>The IDL fragments in this specification must be interpreted as
    required for conforming IDL fragments, as described in the Web IDL
    specification. <a href="#WebIDL">[Web IDL]</a></p>

<h2 id="terminology"><span class="secno">3 </span>Terminology</h2>

<p>The construction "a <code title="">Foo</code> object", where <code
title="">Foo</code> is actually an interface, is sometimes used instead of
the more accurate "an object implementing the interface <code
title="">Foo</code>". </p>

<p>The term DOM is used to refer to the API set made available to scripts in
Web applications, and does not necessarily imply the existence of an actual
<code>Document</code> object or of any other <code>Node</code> objects as
defined in the <a href="#DOM3Core">DOM Core specifications</a>.</p>

<p>A DOM attribute is said to be <em>getting</em> when its value is being
retrieved (such as by author script), and is said to be <em>setting</em> when
a new value is assigned to it. </p>

<p>The term "JavaScript" is used to refer to
<a href="#ECMA262">ECMA-262</a>,
rather than the official term ECMAScript, since the term JavaScript is more widely known.</p>

<p>Throughout this work, time is measured in milliseconds since midnight of January 1, 1970 (UTC).</p>

<h2 id="sec-navigation-timing"><span class="secno">4 </span>Performance Timeline</h2>

<h3 id="sec-performance-timeline"><span class="secno">4.1 </span> The Performance Timeline</h3>
<p>
	All interfaces that participate in the <a href="#sec-performance-timeline">Performance Timeline</a>, such as the
	<a href="http://dvcs.w3.org/hg/webperf/raw-file/tip/specs/ResourceTiming/Overview.html#performance-resource-timing">PerformanceResourceTiming</a>,
	<a href="http://dvcs.w3.org/hg/webperf/raw-file/tip/specs/UserTiming/Overview.html#the-performancemark-interface">PerformanceMark</a>, and
	<a href="http://dvcs.w3.org/hg/webperf/raw-file/tip/specs/UserTiming/Overview.html#the-performancemeasure-interface">PerformanceMeasure</a> interfaces,
	must adhere to the following rules:
</p>

<ul>
	<li>Must extend the <a href="#sec-PerformanceEntry-interface">PerformanceEntry</a> interface</li>
	<li>Must support the
		<a href="#getEntries-method"><code>getEntries</code></a>,
		<a href="#getEntriesByType-method"><code>getEntriesByType</code></a>, and
		<a href="#getEntriesByName-method"><code>getEntriesByName</code></a> methods
	</li>

	<li>
		Must expose a metric name on <a href="http://www.w3.org/TR/navigation-timing/#nt-window-performance">window.performance</a>
		like so:

		<p><code>const unsigned short PERF_[METRIC] = [VALUE]</code>,</p>
		<p>where <code>[METRIC]</code> is the metric name and <code>[VALUE]</code>
		is a unique unsigned short that has not been already taken by another metric name.</p>
	</li>

</ul>

<h3 id="sec-PerformanceEntry-interface"><span class="secno">4.2 </span> The <code><a href="#pt-performanceEntry-interface">PerformanceEntry</a> </code>
interface</h3>
<pre class="idl">interface <dfn id="pt-performanceEntry-interface">PerformanceEntry</dfn> {
  readonly attribute DOMString name;
  readonly attribute unsigned long long startTime;
  readonly attribute unsigned short entryType;
  readonly attribute unsigned long long duration;
};
</pre>

<h4 id="performanceEntry-name"><code>name</code> attribute</h4>
<p>
	The <code>name</code> attribute must return the identifier for this <a href="#pt-performanceEntry-interface">PerformanceEntry</a> object. This
	identifier does not have to be unique.
</p>

<h4 id="performanceEntry-startTime"><code>startTime</code> attribute</h4>
<p>
	The <code>startTime</code> attribute must return the first recorded timestamp
	of this performance metric.
<p>

<h4 id="performanceEntry-entryType"><code>entryType</code> attribute</h4>
<p>
	The <code>entryType</code> attribute must return a const unsigned short exposed on <a href="http://www.w3.org/TR/navigation-timing/#nt-window-performance">window.performance</a>
    that defines the <i>type</i> of the interface represented by this <a href="#pt-performanceEntry-interface">PerformanceEntry</a> object.

</p>

<h4 id="performanceEntry-duration"><code>duration</code> attribute</h4>
<p>
	The <code>duration</code> attribute must return the duration of the entire event being recorded by this <a href="#sec-PerformanceEntry-interface">PerformanceEntry</a>. Typically, this would be the
	time difference between the last recorded timestamp and the first recorded timestamp of this <a href="#sec-PerformanceEntry-interface">PerformanceEntry</a>. A performance metric may choose
	to return a <code>duration</code> of 0, if the duration concept doesn't apply.
<p>

<h3 id="sec-window.performance-attribute"><span class="secno">4.3 </span> The <code id="pt-window-performance">window.performance</code>
attribute</h3>
<pre class="idl">interface <dfn id="pt-performance-interface">Performance</dfn> {
  <a href="#pt-performanceEntryList-type">PerformanceEntryList</a> <a href="#getEntries-method">getEntries</a>();
  <a href="#pt-performanceEntryList-type">PerformanceEntryList</a> <a href="#getEntriesByType-method">getEntriesByType</a>(in unsigned short entryType);
  <a href="#pt-performanceEntryList-type">PerformanceEntryList</a> <a href="#getEntriesByName-method">getEntriesByName</a>(in DOMString name, in optional unsigned short entryType);
};

  typedef sequence &lt;PerformanceEntry&gt; <b><dfn id='pt-performanceEntryList-type'>PerformanceEntryList</dfn></b>;

</pre>

<p>
	The <a href="#pt-window-performance">window.performance</a> attribute provides a hosting area for performance measurement related attributes and methods.
</p>

<div class="methods">
    <h4 id="getEntries-method"><code>getEntries</code> method</h4>
	<p>The <code>getEntries</code> method retrieves a
		<a href="#pt-performanceEntryList-type">PerformanceEntryList</a> that contains all <a href="#sec-PerformanceEntry-interface">PerformanceEntry</a> objects in chronological order with respect to <a href="#performanceEntry-startTime">startTime</a>.
    </p>

		<div class="parameters">
				<p><b>No parameters</b></p>
				<p><b>Return value</b></p>
				A <a href="#pt-performanceEntryList-type">PerformanceEntryList</a> object.
				<p><b>No exceptions</b></p>
		</div>
</div>


<div class="methods">
    <h4 id="getEntriesByType-method"><code>getEntriesByType</code> method</h4>
	<p>The <code>getEntriesByType</code> method retrieves a
		<a href="#pt-performanceEntryList-type">PerformanceEntryList</a> that contains <a href="#sec-PerformanceEntry-interface">PerformanceEntry</a> objects, in chronological order with respect to <a href="#performanceEntry-startTime">startTime</a>,
		that have the same value for the <code>entryType</code> attribute of <a href="#sec-PerformanceEntry-interface">PerformanceEntry</a> as the <code>entryType</code> parameter.
    </p>

		<div class="parameters">
				<p><b>Parameter</b></p>
					<p>in unsigned short <code>entryType</code></p>
					<p>
						The <a href="#pt-performanceEntryList-type">PerformanceEntryList</a> must contain <a href="#sec-PerformanceEntry-interface">PerformanceEntry</a> objects
						that have the same value for the <code>entryType</code> attribute of <a href="#sec-PerformanceEntry-interface">PerformanceEntry</a> as the <code>entryType</code> parameter.
						If no such <a href="#sec-PerformanceEntry-interface">PerformanceEntry</a> objects exist, the <a href="#pt-performanceEntryList-type">PerformanceEntryList</a>
						must be empty.
					</p>
				<p><b>Return value</b></p>
				A <a href="#pt-performanceEntryList-type">PerformanceEntryList</a> object.
				<p><b>No exceptions</b></p>
		</div>
</div>

<div class="methods">
    <h4 id="getEntriesByName-method"><code>getEntriesByName</code> method</h4>
	<p>
		The <code>getEntriesByName</code> method retrieves a
		<a href="#pt-performanceEntryList-type">PerformanceEntryList</a> that contains <a href="#sec-PerformanceEntry-interface">PerformanceEntry</a> objects, in chronological order with respect to <a href="#performanceEntry-startTime">startTime</a>,
		that have the same value for the <code>name</code> attribute of <a href="#sec-PerformanceEntry-interface">PerformanceEntry</a> as the <code>name</code> parameter
		and, if specified, have the same value for the <code>entryType</code> attribute of <a href="#sec-PerformanceEntry-interface">PerformanceEntry</a> as the <code>entryType</code> parameter.
    </p>
		<div class="parameters">
				<p><b>Parameter</b></p>
					<p>in DOMString <code>name</code></p>
					<p>
						The <a href="#pt-performanceEntryList-type">PerformanceEntryList</a> must contain <a href="#sec-PerformanceEntry-interface">PerformanceEntry</a> objects
						that have the same value for the <code>name</code> attribute of <a href="#sec-PerformanceEntry-interface">PerformanceEntry</a> as the <code>name</code> parameter.
						If no such <a href="#sec-PerformanceEntry-interface">PerformanceEntry</a> objects exist, the <a href="#pt-performanceEntryList-type">PerformanceEntryList</a> must be empty.
					</p>
					<p>in optional unsigned short <code>entryType</code></p>
					<p>
						The <a href="#pt-performanceEntryList-type">PerformanceEntryList</a> must only contain <a href="#sec-PerformanceEntry-interface">PerformanceEntry</a> objects
						that have the same value for the <code>entryType</code> attribute of <a href="#sec-PerformanceEntry-interface">PerformanceEntry</a> as the <code>entryType</code> parameter
						and have the same value for the <code>name</code> attribute of <a href="#sec-PerformanceEntry-interface">PerformanceEntry</a> as the <code>name</code> parameter.
						If no such <a href="#sec-PerformanceEntry-interface">PerformanceEntry</a> objects exist, the <a href="#pt-performanceEntryList-type">PerformanceEntryList</a>
						must be empty.
					</p>
				<p><b>Return value</b></p>
				A <a href="#pt-performanceEntryList-type">PerformanceEntryList</a> object.
				<p><b>No exceptions</b></p>
		</div>
</div>


<h3 id="sec-PerformanceTiming"><span class="secno">4.4 </span> The <code>PerformanceTiming</code>
interface</h3>

<p>The <a href="http://www.w3.org/TR/navigation-timing/#sec-navigation-timing-interface">PerformanceTiming</a> interface does not extend
the <a href="#sec-PerformanceEntry-interface">PerformanceEntry</a> interface. However, when the <a href="#getEntriesByType-method">getEntriesByType</a> and
<a href="#getEntriesByName-method">getEntriesByName</a> methods are called with the <code>entryType</code> argument of <code>PERF_NAVIGATION</code>,
a <a href="#pt-performanceEntryList-type">PerformanceEntryList</a> with a <a href="#sec-PerformanceEntry-interface">PerformanceEntry</a> object with the following values must be returned:
</p>

<div class="parameters">
    <p>The <code>name</code> attribute will return the "document" DOMString.</p>
    <p>The <code>entryType</code> attribute will return <code id="perf-navigation">PERF_NAVIGATION</code>.</p>
    <p>The <code id="timing-startTime">startTime</code> attribute will return a timestamp with the same value as <a href="http://www.w3.org/TR/navigation-timing/#nt-navigation-start">navigationStart</a>.</p>
    <p>The <code>duration</code> attribute will return a timestamp equal to the difference between <a href="http://www.w3.org/TR/navigation-timing/#nt-load-end">loadEventEnd</a> and <a href="http://www.w3.org/TR/navigation-timing/#nt-navigation-start">navigationStart</a>, respectively.</p>
</div>


<h2 id="references"><span class="secno">5 </span>References</h2>

<dl id='references-list'>
<dt><a name='rfc2119' id='rfc2119'>[IETF RFC 2119]</a></dt>
<dd>
 <cite><a href='http://www.ietf.org/rfc/rfc2119.txt'>Key words for use in RFCs to Indicate Requirement Levels</a></cite>, Scott Bradner, Author. Internet Engineering Task Force, March 1997. Available at http://www.ietf.org/rfc/rfc2119.txt.
</dd>
<dt><a name='rfc2616' id='rfc2616'>[IETF RFC 2616]</a></dt>
<dd>
 <cite><a href='http://www.ietf.org/rfc/rfc2616.txt'>Hypertext Transfer Protocol -- HTTP/1.1</a></cite>, R. Fielding et al., Authors. Internet Engineering Task Force, June 1999. Available at <a href='http://www.ietf.org/rfc/rfc2616.txt'>http://www.ietf.org/rfc/rfc2616.txt</a>.
</dd>
<dt>[<a name="DOM3Core" id='DOM3Core'>DOM Level 3 Core</a>]</dt>
<dd>
        <cite><a href="http://www.w3.org/TR/2004/REC-DOM-Level-3-Core-20040407/">Document Object Model Level 3 Core
        Specification</a></cite>, A. Le Hors, et al., Editors. World
        Wide Web Consortium, 7 April 2004. This version of the Document
        Object Model Level 3 Core Recommendation is
        http://www.w3.org/TR/2004/REC-DOM-Level-3-Core-20040407. The <a class="normative" href="http://www.w3.org/TR/domcore/">latest version of
        DOM Core</a> is available at
        http://www.w3.org/TR/domcore/.
      </dd>
<dt>[<a name="ECMA262" id="ECMA262">ECMA-262</a>]</dt><dd>
	<cite><a href='http://www.ecma-international.org/publications/standards/Ecma-262.htm'>ECMAScript Language Specification</a></cite>, 5<sup>th</sup>
	Edition. ECMA International, Standard
	ECMA-262, December 2009. This version of the ECMAScript
	Language is available from http://www.ecma-international.org/publications/standards/Ecma-262.htm.
<dt>[<a name="HTML5" id="HTML5">HTML5</a>]</dt>
<dd><cite><a href='http://www.w3.org/TR/html5/'>HTML5</a></cite>, Ian Hickson, Editor. World Wide Web Consortium, May 2011. This version of the HTML5 is available from <a href='http://www.w3.org/TR/html5/'>http://www.w3.org/TR/html5/</a>. The <a href='http://dev.w3.org/html5/spec/'>latest editor's draft</a> is available at http://dev.w3.org/html5/spec/.</dd>

<dt>[<a name="JSMeasure" id="JSMeasure">JSMEASURE</a>]</dt>
<dd><cite><a href='http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.69.7329&amp;rep=rep1&amp;type=pdf'>Measuring Client-Perceived Response Times on the WWW</a></cite>, R. Rajamony and M. Elnozahy, The Proceedings of the 3rd USENIX Symposium on Internet Technologies and Systems (USITS), March 2001.</dd>

   <dt>[<a name="NavigationTiming" id="NavigationTiming">Navigation Timing</a>]</dt>
   <dd><cite><a href='http://www.w3.org/TR/2011/CR-navigation-timing-20110602/'>Navigation Timing</a></cite>, Zhiheng Wang, Editor. World Wide Web Consortium, June 2011. This version of the Navigation Timing specification is available from http://www.w3.org/TR/2011/CR-navigation-timing-20110602/. The <a href='http://www.w3.org/TR/navigation-timing/'>latest version of Navigation Timing</a> is available at http://www.w3.org/TR/navigation-timing/.</dd>

   <dt>[<a name="WebIDL" id="WebIDL">Web IDL</a>]</dt>
   <dd><cite><a href='http://www.w3.org/TR/2011/WD-WebIDL-20110712/'>Web IDL</a></cite>, Cameron McCormack, Editor. World Wide Web Consortium, July 2011. This version of the Web IDL specification is available from http://www.w3.org/TR/2011/WD-WebIDL-20110712/. The <a href='http://www.w3.org/TR/WebIDL/'>latest version of Web IDL</a> is available at http://www.w3.org/TR/WebIDL/.</dd>

</dl>

<h2 class="no-num" id="acknowledgements">Acknowledgements</h2>

<p>I would like to offer my sincere thanks to all the people that I have been
in touch with regarding this draft for their reviews and feedback.</p>
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