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+ <body><div class="head">
+ <p>
+
+ <a href="http://www.w3.org/"><img width="72" height="48" src="http://www.w3.org/Icons/w3c_home" alt="W3C"></a>
+
+ </p>
+ <h1 class="title" id="title">Proximity Events</h1>
+
+ <h2 id="w3c-working-draft-28-november-2012"><abbr title="World Wide Web Consortium">W3C</abbr> Working Draft 28 November 2012</h2>
+ <dl>
+
+ <dt>This version:</dt>
+ <dd><a href="http://www.w3.org/TR/2012/WD-proximity-20121128/">http://www.w3.org/TR/2012/WD-proximity-20121128/</a></dd>
+ <dt>Latest published version:</dt>
+ <dd><a href="http://www.w3.org/TR/proximity/">http://www.w3.org/TR/proximity/</a></dd>
+
+
+ <dt>Latest editor's draft:</dt>
+ <dd><a href="http://dvcs.w3.org/hg/dap/raw-file/tip/proximity/Overview.html">http://dvcs.w3.org/hg/dap/raw-file/tip/proximity/Overview.html</a></dd>
+
+
+
+
+
+ <dt>Previous version:</dt>
+ <dd><a href="http://www.w3.org/TR/2012/WD-proximity-20120712/">http://www.w3.org/TR/2012/WD-proximity-20120712/</a></dd>
+
+
+ <dt>Editors:</dt>
+ <dd><span>Anssi Kostiainen</span>, <a href="http://nokia.com/">Nokia</a></dd>
+<dd><span>Dzung D Tran</span>, <a href="http://intel.com/">Intel</a></dd>
+
+
+ </dl>
+
+
+
+
+
+ <p class="copyright">
+ <a href="http://www.w3.org/Consortium/Legal/ipr-notice#Copyright">Copyright</a> ©
+ 2012
+
+ <a href="http://www.w3.org/"><abbr title="World Wide Web Consortium">W3C</abbr></a><sup>®</sup>
+ (<a href="http://www.csail.mit.edu/"><abbr title="Massachusetts Institute of Technology">MIT</abbr></a>,
+ <a href="http://www.ercim.eu/"><abbr title="European Research Consortium for Informatics and Mathematics">ERCIM</abbr></a>,
+ <a href="http://www.keio.ac.jp/">Keio</a>), All Rights Reserved.
+ <abbr title="World Wide Web Consortium">W3C</abbr> <a href="http://www.w3.org/Consortium/Legal/ipr-notice#Legal_Disclaimer">liability</a>,
+ <a href="http://www.w3.org/Consortium/Legal/ipr-notice#W3C_Trademarks">trademark</a> and
+ <a href="http://www.w3.org/Consortium/Legal/copyright-documents">document use</a> rules apply.
+ </p>
+
+
+ <hr>
+</div>
+ <section id="abstract" class="introductory"><h2>Abstract</h2><p>
+ This specification defines a means to receive events that correspond to
+ a proximity sensor detecting the presence of a physical object.
+ </p></section><section id="sotd" class="introductory"><h2>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 <abbr title="World Wide Web Consortium">W3C</abbr> publications and the latest revision
+ of this technical report can be found in the <a href="http://www.w3.org/TR/"><abbr title="World Wide Web Consortium">W3C</abbr> technical reports
+ index</a> at http://www.w3.org/TR/.</em>
+ </p>
+
+ <p>
+ The functionality described in this specification was initially
+ specified as part of the
+ <a href="http://dvcs.w3.org/hg/dap/raw-file/tip/sensor-api/Overview.html">
+ Sensor API</a> but has been extracted in order to be more
+ straightforward to implement, and in order to produce a specification
+ that could be implemented on its own merits without interference with
+ other features.
+ </p>
+
+ <p>
+ This document was published by the <a href="http://www.w3.org/2009/dap/">Device APIs Working Group</a> as a Last Call Working Draft.
+
+ This document is intended to become a <abbr title="World Wide Web Consortium">W3C</abbr> Recommendation.
+
+ If you wish to make comments regarding this document, please send them to
+ <a href="mailto:public-device-apis@w3.org">public-device-apis@w3.org</a>
+ (<a href="mailto:public-device-apis-request@w3.org?subject=subscribe">subscribe</a>,
+ <a href="http://lists.w3.org/Archives/Public/public-device-apis/">archives</a>).
+ The Last Call period ends 30 November 1899.
+
+ All feedback is welcome.
+ </p>
+
+ <p>
+ Publication as a Working Draft does not imply endorsement by the <abbr title="World Wide Web Consortium">W3C</abbr> 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 is a Last Call Working Draft and thus the Working Group has determined that this document has satisfied the
+ relevant technical requirements and is sufficiently stable to advance through the Technical Recommendation process.
+ </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 <abbr title="World Wide Web Consortium">W3C</abbr> Patent Policy</a>.
+
+
+
+
+ <abbr title="World Wide Web Consortium">W3C</abbr> maintains a <a href="http://www.w3.org/2004/01/pp-impl/43696/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 <abbr title="World Wide Web Consortium">W3C</abbr> Patent Policy</a>.
+
+
+ </p>
+
+
+
+
+</section><section id="toc"><h2 class="introductory">Table of Contents</h2><ul class="toc"><li class="tocline"><a href="#introduction" class="tocxref"><span class="secno">1. </span>Introduction</a></li><li class="tocline"><a href="#conformance" class="tocxref"><span class="secno">2. </span>Conformance</a></li><li class="tocline"><a href="#terminology" class="tocxref"><span class="secno">3. </span>Terminology</a></li><li class="tocline"><a href="#security-and-privacy-considerations" class="tocxref"><span class="secno">4. </span>Security and privacy considerations</a></li><li class="tocline"><a href="#device-proximity" class="tocxref"><span class="secno">5. </span>Device proximity</a><ul class="toc"><li class="tocline"><a href="#attributes" class="tocxref"><span class="secno">5.1 </span>Attributes</a></li><li class="tocline"><a href="#deviceproximityevent-interface" class="tocxref"><span class="secno">5.2 </span><span class="formerLink"><code>DeviceProximityEvent</code></span> Interface</a><ul class="toc"><li class="tocline"><a href="#attributes-1" class="tocxref"><span class="secno">5.2.1 </span>Attributes</a></li><li class="tocline"><a href="#dictionary-deviceproximityeventinit-members" class="tocxref"><span class="secno">5.2.2 </span>Dictionary <span class="formerLink"><code>DeviceProximityEventInit</code></span> Members</a></li><li class="tocline"><a href="#event-handlers" class="tocxref"><span class="secno">5.2.3 </span>Event handlers</a></li></ul></li></ul></li><li class="tocline"><a href="#user-proximity" class="tocxref"><span class="secno">6. </span>User proximity</a><ul class="toc"><li class="tocline"><a href="#attributes-2" class="tocxref"><span class="secno">6.1 </span>Attributes</a></li><li class="tocline"><a href="#userproximityevent-interface" class="tocxref"><span class="secno">6.2 </span><span class="formerLink"><code>UserProximityEvent</code></span> Interface</a><ul class="toc"><li class="tocline"><a href="#attributes-3" class="tocxref"><span class="secno">6.2.1 </span>Attributes</a></li><li class="tocline"><a href="#dictionary-userproximityeventinit-members" class="tocxref"><span class="secno">6.2.2 </span>Dictionary <span class="formerLink"><code>UserProximityEventInit</code></span> Members</a></li><li class="tocline"><a href="#event-handlers-1" class="tocxref"><span class="secno">6.2.3 </span>Event handlers</a></li></ul></li></ul></li><li class="tocline"><a href="#acknowledgements" class="tocxref"><span class="secno">A. </span>Acknowledgements</a></li><li class="tocline"><a href="#references" class="tocxref"><span class="secno">B. </span>References</a><ul class="toc"><li class="tocline"><a href="#normative-references" class="tocxref"><span class="secno">B.1 </span>Normative references</a></li></ul></li></ul></section>
+
+
+
+ <section class="informative" id="introduction">
+ <!--OddPage--><h2><span class="secno">1. </span>Introduction</h2><p><em>This section is non-normative.</em></p>
+ <p>
+ The <a href="#idl-def-DeviceProximityEvent" class="idlType"><code>DeviceProximityEvent</code></a> interface provides web developers
+ information about the distance between the hosting device and a
+ nearby object.
+ </p>
+ <p>
+ The <a href="#idl-def-UserProximityEvent" class="idlType"><code>UserProximityEvent</code></a> interface provides web developers
+ a user-agent- and platform-specific approximation that the hosting
+ device has sensed a nearby object.
+ </p>
+ <p>
+ This is achieved by interrogating a proximity sensor of a device, which
+ is a sensor that can detect the presence of a physical object without
+ physical contact. Not all devices contain a proximity sensor, and when
+ there is no proximity sensor, this API is still exposed to the
+ scripting environment but it does nothing.
+ </p>
+ <p>
+ Because most proximity sensors detect electromagnetic radiation (e.g.,
+ an infrared light or a magnetic field), certain material properties can
+ interfere with the sensor's ability to sense the presence of a physical
+ object. Things that can interfere with a sensor include, but are not
+ limited to, the material's translucency, reflectiveness, color,
+ temperature, chemical composition, and even the angle at which the
+ object is reflecting the radiation back at the sensor. As such,
+ proximity sensors should not be relied on as a means to measure
+ distance: the only thing that can be deduced from a proximity sensor is
+ that an object is somewhere in the distance between the minimum sensing
+ distance and the maximum sensing distance with some degree of
+ certainty.
+ </p>
+ </section>
+
+ <section id="conformance"><!--OddPage--><h2><span class="secno">2. </span>Conformance</h2>
+<p>
+ As well as sections marked as non-normative, all authoring guidelines, diagrams, examples,
+ and notes in this specification are non-normative. Everything else in this specification is
+ normative.
+</p>
+<p>
+ The key words <em class="rfc2119" title="must">must</em>, <em class="rfc2119" title="must not">must not</em>, <em class="rfc2119" title="required">required</em>, <em class="rfc2119" title="should">should</em>, <em class="rfc2119" title="should not">should not</em>, <em class="rfc2119" title="recommended">recommended</em>, <em class="rfc2119" title="may">may</em>,
+ and <em class="rfc2119" title="optional">optional</em> in this specification are to be interpreted as described in [<cite><a class="bibref" href="#bib-RFC2119">RFC2119</a></cite>].
+</p>
+
+ <p>
+ This specification defines conformance criteria that apply to a single
+ product: the <dfn id="dfn-user-agent">user agent</dfn> that implements the
+ interfaces that it contains.
+ </p>
+ </section>
+
+ <section id="terminology">
+ <!--OddPage--><h2><span class="secno">3. </span>Terminology</h2>
+ <p>
+ The <code><a href="http://dev.w3.org/html5/spec/webappapis.html#eventhandler">
+ EventHandler</a></code> interface represents a callback used for event
+ handlers as defined in [<cite><a class="bibref" href="#bib-HTML5">HTML5</a></cite>].
+ </p>
+ <p>
+ The concepts <dfn id="dfn-queue-a-task"><a href="http://dev.w3.org/html5/spec/webappapis.html#queue-a-task">
+ queue a task</a></dfn> and
+ <dfn id="dfn-fires-a-simple-event"><a href="http://dev.w3.org/html5/spec/webappapis.html#fire-a-simple-event">
+ fires a simple event</a></dfn> are defined in [<cite><a class="bibref" href="#bib-HTML5">HTML5</a></cite>].
+ </p>
+ <p>
+ The terms <dfn id="dfn-event-handlers"><a href="http://dev.w3.org/html5/spec/webappapis.html#event-handlers">
+ event handlers</a></dfn> and
+ <dfn id="dfn-event-handler-event-types"><a href="http://dev.w3.org/html5/spec/webappapis.html#event-handler-event-type">
+ event handler event types</a></dfn> are defined in [<cite><a class="bibref" href="#bib-HTML5">HTML5</a></cite>].
+ </p>
+ <p>The concepts <dfn id="dfn-create-an-event">
+ <a href="http://dvcs.w3.org/hg/domcore/raw-file/tip/Overview.html#constructing-events">
+ create an event</a></dfn> and <dfn id="dfn-fire-an-event">
+ <a href="http://dvcs.w3.org/hg/domcore/raw-file/tip/Overview.html#firing-events">
+ fire an event</a></dfn> are defined in [<cite><a class="bibref" href="#bib-DOM4">DOM4</a></cite>].
+ </p><p>
+ The <dfn id="dfn-current-device-proximity">current device proximity</dfn> is a value that represents the
+ proximity of the hosting device to a physical object (i.e., some value
+ between the <a href="#dfn-maximum-sensing-distance" class="internalDFN">maximum sensing distance</a> and the <a href="#dfn-minimum-sensing-distance" class="internalDFN">minimum sensing
+ distance</a>), in centimeters.
+ </p>
+ <p>
+ The <dfn id="dfn-minimum-sensing-distance">minimum sensing distance</dfn> at which the sensor can detect
+ a physical object.
+ </p>
+ <p>
+ The <dfn id="dfn-maximum-sensing-distance">maximum sensing distance</dfn> at which the sensor can detect
+ a physical object.
+ </p>
+ <p>
+ The <dfn id="dfn-current-user-proximity-state">current user proximity state</dfn>, a boolean state, is a
+ user-agent- and platform-specific approximation of the closeness of a
+ physical object with the hosting device.
+ </p>
+ </section>
+
+ <section id="security-and-privacy-considerations">
+ <!--OddPage--><h2><span class="secno">4. </span>Security and privacy considerations</h2>
+ <p>
+ </p>
+ </section>
+
+ <section id="device-proximity">
+ <!--OddPage--><h2><span class="secno">5. </span>Device proximity</h2>
+ <p>
+ The HTML5 specification [<cite><a class="bibref" href="#bib-HTML5">HTML5</a></cite>] defines a <a href="#idl-def-Window" class="idlType"><code>Window</code></a> interface,
+ which this specification extends:
+ </p>
+ <pre class="idl"><span class="idlInterface" id="idl-def-Window">partial interface <span class="idlInterfaceID">Window</span> {
+<span class="idlAttribute"> attribute <span class="idlAttrType"><a>EventHandler</a></span> <span class="idlAttrName"><a href="#widl-Window-ondeviceproximity">ondeviceproximity</a></span>;</span>
+};</span></pre><section id="attributes"><h3><span class="secno">5.1 </span>Attributes</h3><dl class="attributes"><dt id="widl-Window-ondeviceproximity"><code>ondeviceproximity</code> of type <span class="idlAttrType"><a>EventHandler</a></span></dt><dd>
+ </dd></dl></section>
+ <p>
+ The <code>ondeviceproximity</code> event handler and its corresponding
+ event handler event type <code>deviceproximity</code> <em class="rfc2119" title="must">must</em> be supported
+ as an IDL attribute by all objects implementing the <a href="#idl-def-Window" class="idlType"><code>Window</code></a>
+ interface.
+ </p>
+ <section id="deviceproximityevent-interface">
+ <h3><span class="secno">5.2 </span><a href="#idl-def-DeviceProximityEvent" class="idlType"><code>DeviceProximityEvent</code></a> Interface</h3>
+ <pre class="idl"><span class="idlInterface" id="idl-def-DeviceProximityEvent">[<span class="extAttr">Constructor (DOMString type, optional DeviceProximityEventInit eventInitDict)</span>]
+interface <span class="idlInterfaceID">DeviceProximityEvent</span> : <span class="idlSuperclass"><a>Event</a></span> {
+<span class="idlAttribute"> readonly attribute <span class="idlAttrType"><a>double</a></span> <span class="idlAttrName"><a href="#widl-DeviceProximityEvent-value">value</a></span>;</span>
+<span class="idlAttribute"> readonly attribute <span class="idlAttrType"><a>double</a></span> <span class="idlAttrName"><a href="#widl-DeviceProximityEvent-min">min</a></span>;</span>
+<span class="idlAttribute"> readonly attribute <span class="idlAttrType"><a>double</a></span> <span class="idlAttrName"><a href="#widl-DeviceProximityEvent-max">max</a></span>;</span>
+};<br><span class="idlDictionary" id="idl-def-DeviceProximityEventInit">dictionary <span class="idlDictionaryID">DeviceProximityEventInit</span> : <span class="idlSuperclass"><a>EventInit</a></span> {
+<span class="idlMember"> <span class="idlMemberType"><a>double</a></span> <span class="idlMemberName"><a href="#widl-DeviceProximityEventInit-value">value</a></span>;</span>
+<span class="idlMember"> <span class="idlMemberType"><a>double</a></span> <span class="idlMemberName"><a href="#widl-DeviceProximityEventInit-min">min</a></span>;</span>
+<span class="idlMember"> <span class="idlMemberType"><a>double</a></span> <span class="idlMemberName"><a href="#widl-DeviceProximityEventInit-max">max</a></span>;</span>
+};</span></span></pre><section id="attributes-1"><h4><span class="secno">5.2.1 </span>Attributes</h4><dl class="attributes"><dt id="widl-DeviceProximityEvent-max"><code>max</code> of type <span class="idlAttrType"><a>double</a></span>, readonly</dt><dd>
+ The <a href="#dfn-maximum-sensing-distance" class="internalDFN">maximum sensing distance<strong></strong></a>.
+ </dd><dt id="widl-DeviceProximityEvent-min"><code>min</code> of type <span class="idlAttrType"><a>double</a></span>, readonly</dt><dd>
+ The <a href="#dfn-minimum-sensing-distance" class="internalDFN"> minimum sensing distance</a>.
+ </dd><dt id="widl-DeviceProximityEvent-value"><code>value</code> of type <span class="idlAttrType"><a>double</a></span>, readonly</dt><dd>
+ The <a href="#dfn-current-device-proximity" class="internalDFN">current device proximity</a>.
+ </dd></dl></section>
+ <section id="dictionary-deviceproximityeventinit-members"><h4><span class="secno">5.2.2 </span>Dictionary <a class="idlType" href="#idl-def-DeviceProximityEventInit"><code>DeviceProximityEventInit</code></a> Members</h4><dl class="dictionary-members"><dt id="widl-DeviceProximityEventInit-max"><code>max</code> of type <span class="idlMemberType"><a>double</a></span></dt><dd></dd><dt id="widl-DeviceProximityEventInit-min"><code>min</code> of type <span class="idlMemberType"><a>double</a></span></dt><dd></dd><dt id="widl-DeviceProximityEventInit-value"><code>value</code> of type <span class="idlMemberType"><a>double</a></span></dt><dd></dd></dl></section>
+ <p>
+ When a <dfn id="dfn-user-agent-1">user agent</dfn> is required to <dfn id="dfn-fire-a-device-proximity-event">fire a device
+ proximity event</dfn>, the <dfn id="dfn-user-agent-2">user agent</dfn> <em class="rfc2119" title="must">must</em> run the
+ following steps:
+ </p>
+ <ol class="rule">
+ <li>
+ <a>Create an event</a> that uses the <a href="#idl-def-DeviceProximityEvent" class="idlType"><code>DeviceProximityEvent</code></a>
+ interface, with the name <code>deviceproximity</code>, which
+ bubbles, is not cancelable, and has no default action, that also
+ meets the following conditions:
+ <ol>
+ <li>
+ If the implementation is unable to report the <a href="#dfn-current-device-proximity" class="internalDFN">current
+ device proximity</a>, initialize the <code>value</code>
+ attribute to positive Infinity, otherwise initialize the
+ attribute to the <a href="#dfn-current-device-proximity" class="internalDFN">current device proximity</a>.
+ </li>
+ <li>
+ If the implementation is unable to report the <a href="#dfn-minimum-sensing-distance" class="internalDFN">minimum
+ sensing distance</a>, initialize the <code>min</code>
+ attribute to negative Infinity, otherwise initialize the
+ attribute to the <a href="#dfn-minimum-sensing-distance" class="internalDFN">minimum sensing distance</a>.
+ </li>
+ <li>
+ If the implementation is unable to report the <a href="#dfn-maximum-sensing-distance" class="internalDFN">maximum
+ sensing distance</a>, initialize the <code>max</code>
+ attribute to positive Infinity, otherwise initialize the
+ attribute to the <a href="#dfn-maximum-sensing-distance" class="internalDFN">maximum sensing distance</a>.
+ </li>
+ </ol>
+ </li>
+ <li>
+ <a>Queue a task</a> to dispatch the newly created event at the
+ <a href="#idl-def-Window" class="idlType"><code>Window</code></a> object.
+ </li>
+ </ol>
+ <p>
+ When <a>the current proximity</a> changes, the <dfn id="dfn-user-agent-3">user
+ agent</dfn> <em class="rfc2119" title="must">must</em> <a href="#dfn-fire-a-device-proximity-event" class="internalDFN">fire a device proximity event</a>.
+ </p>
+ <div class="note"><div class="note-title"><span>Note</span></div><div class="">
+ The definition of granularity i.e. how often the event is fired is
+ left to the implementation. Implementations may fire the event if
+ they have reason to believe that the page does not have sufficiently
+ fresh data. Different devices may also support different minimum and
+ maximum sensing distances as well as different resolution, thus
+ authors are strongly advised to use the <a href="#idl-def-UserProximityEvent" class="idlType"><code>UserProximityEvent</code></a>
+ interface if the are only interested in finding out if the user is
+ near or far.
+ </div></div>
+ <section id="event-handlers">
+ <h4><span class="secno">5.2.3 </span>Event handlers</h4>
+ <p>
+ The following are the <a href="#dfn-event-handlers" class="internalDFN">event handlers</a> (and their corresponding
+ <a href="#dfn-event-handler-event-types" class="internalDFN">event handler event types</a>) that <em class="rfc2119" title="must">must</em> be supported as
+ attributes by the <code>Window</code> object:
+ </p>
+ <table class="simple">
+ <thead>
+ <tr>
+ <th>event handler</th>
+ <th>event handler event type</th>
+ </tr>
+ </thead>
+ <tbody>
+ <tr>
+ <td><strong><code>ondeviceproximity</code></strong></td>
+ <td><code>deviceproximity</code></td>
+ </tr>
+ </tbody>
+ </table>
+ </section>
+ </section>
+ </section>
+
+ <section id="user-proximity">
+ <!--OddPage--><h2><span class="secno">6. </span>User proximity</h2>
+ <p>
+ The HTML5 specification [<cite><a class="bibref" href="#bib-HTML5">HTML5</a></cite>] defines a <a href="#idl-def-Window" class="idlType"><code>Window</code></a> interface,
+ which this specification extends:
+ </p>
+ <pre class="idl"><span class="idlInterface" id="idl-def-Window-1">partial interface <span class="idlInterfaceID">Window</span> {
+<span class="idlAttribute"> attribute <span class="idlAttrType"><a>EventHandler</a></span> <span class="idlAttrName"><a href="#widl-Window-onuserproximity">onuserproximity</a></span>;</span>
+};</span></pre><section id="attributes-2"><h3><span class="secno">6.1 </span>Attributes</h3><dl class="attributes"><dt id="widl-Window-onuserproximity"><code>onuserproximity</code> of type <span class="idlAttrType"><a>EventHandler</a></span></dt><dd>
+ </dd></dl></section>
+ <p>
+ The <code>onuserproximity</code> event handler and its corresponding
+ event handler event type <code>userproximity</code> <em class="rfc2119" title="must">must</em> be supported
+ as an IDL attribute by all objects implementing the <a href="#idl-def-Window" class="idlType"><code>Window</code></a>
+ interface.
+ </p>
+ <section id="userproximityevent-interface">
+ <h3><span class="secno">6.2 </span><a href="#idl-def-UserProximityEvent" class="idlType"><code>UserProximityEvent</code></a> Interface</h3>
+ <pre class="idl"><span class="idlInterface" id="idl-def-UserProximityEvent">[<span class="extAttr">Constructor (DOMString type, optional UserProximityEventInit eventInitDict)</span>]
+interface <span class="idlInterfaceID">UserProximityEvent</span> : <span class="idlSuperclass"><a>Event</a></span> {
+<span class="idlAttribute"> readonly attribute <span class="idlAttrType"><a>boolean</a></span> <span class="idlAttrName"><a href="#widl-UserProximityEvent-near">near</a></span>;</span>
+};<br><span class="idlDictionary" id="idl-def-UserProximityEventInit">dictionary <span class="idlDictionaryID">UserProximityEventInit</span> : <span class="idlSuperclass"><a>EventInit</a></span> {
+<span class="idlMember"> <span class="idlMemberType"><a>boolean</a></span> <span class="idlMemberName"><a href="#widl-UserProximityEventInit-near">near</a></span>;</span>
+};</span></span></pre><section id="attributes-3"><h4><span class="secno">6.2.1 </span>Attributes</h4><dl class="attributes"><dt id="widl-UserProximityEvent-near"><code>near</code> of type <span class="idlAttrType"><a>boolean</a></span>, readonly</dt><dd>
+ The <a href="#dfn-current-user-proximity-state" class="internalDFN">current user proximity state</a>.
+ </dd></dl></section>
+ <section id="dictionary-userproximityeventinit-members"><h4><span class="secno">6.2.2 </span>Dictionary <a class="idlType" href="#idl-def-UserProximityEventInit"><code>UserProximityEventInit</code></a> Members</h4><dl class="dictionary-members"><dt id="widl-UserProximityEventInit-near"><code>near</code> of type <span class="idlMemberType"><a>boolean</a></span></dt><dd></dd></dl></section>
+ <p>
+ When a <dfn id="dfn-user-agent-4">user agent</dfn> is required to <dfn id="dfn-fire-a-user-proximity-event">fire a user
+ proximity event</dfn>, the <dfn id="dfn-user-agent-5">user agent</dfn> <em class="rfc2119" title="must">must</em> run the
+ following steps:
+ </p>
+ <ol class="rule">
+ <li>
+ <a>Create an event</a> that uses the <a href="#idl-def-UserProximityEvent" class="idlType"><code>UserProximityEvent</code></a>
+ interface, with the name <code>userproximity</code>, which bubbles,
+ is not cancelable, and has no default action, that also meets the
+ following conditions:
+ <ol>
+ <li>
+ If the implementation is unable to report the <a href="#dfn-current-user-proximity-state" class="internalDFN">current user
+ proximity state</a>, initialize the <code>near</code> attribute
+ to false, otherwise initialize the attribute to the <a href="#dfn-current-user-proximity-state" class="internalDFN">current
+ user proximity state</a>.
+ </li>
+ </ol>
+ </li>
+ <li>
+ <a>Queue a task</a> to dispatch the newly created event at the
+ <a href="#idl-def-Window" class="idlType"><code>Window</code></a> object.
+ </li>
+ </ol>
+ <p>
+ When the <a href="#dfn-current-user-proximity-state" class="internalDFN">current user proximity state</a> changes, the <dfn id="dfn-user-agent-6">user
+ agent</dfn> <em class="rfc2119" title="must">must</em> <a href="#dfn-fire-a-user-proximity-event" class="internalDFN">fire a user proximity event</a>.
+ </p>
+ <section id="event-handlers-1">
+ <h4><span class="secno">6.2.3 </span>Event handlers</h4>
+ <p>
+ The following are the <a href="#dfn-event-handlers" class="internalDFN">event handlers</a> (and their corresponding
+ <a href="#dfn-event-handler-event-types" class="internalDFN">event handler event types</a>) that <em class="rfc2119" title="must">must</em> be supported as
+ attributes by the <code>Window</code> object:
+ </p>
+ <table class="simple">
+ <thead>
+ <tr>
+ <th>event handler</th>
+ <th>event handler event type</th>
+ </tr>
+ </thead>
+ <tbody>
+ <tr>
+ <td><strong><code>onuserproximity</code></strong></td>
+ <td><code>userproximity</code></td>
+ </tr>
+ </tbody>
+ </table>
+ </section>
+ </section>
+ </section>
+
+ <section class="appendix" id="acknowledgements">
+ <!--OddPage--><h2><span class="secno">A. </span>Acknowledgements</h2>
+ <p>
+ Doug Turner for the initial prototype. All Device APIs working group
+ participants who have sent helpful feedback. Marcos Caceres for his
+ excellent work on the test suite.
+ </p>
+ </section>
+
+
+<section id="references" class="appendix"><!--OddPage--><h2><span class="secno">B. </span>References</h2><section id="normative-references"><h3><span class="secno">B.1 </span>Normative references</h3><dl class="bibliography"><dt id="bib-DOM4">[DOM4]</dt><dd>Anne van Kesteren; Aryeh Gregor; Ms2ger. <a href="http://dvcs.w3.org/hg/domcore/raw-file/tip/Overview.html/"><cite>DOM4.</cite></a> URL: <a href="http://dvcs.w3.org/hg/domcore/raw-file/tip/Overview.html/">http://dvcs.w3.org/hg/domcore/raw-file/tip/Overview.html/</a>
+</dd><dt id="bib-HTML5">[HTML5]</dt><dd>Ian Hickson; David Hyatt. <a href="http://www.w3.org/TR/html5"><cite>HTML5.</cite></a> 29 March 2012. W3C Working Draft. (Work in progress.) URL: <a href="http://www.w3.org/TR/html5">http://www.w3.org/TR/html5</a>
+</dd><dt id="bib-RFC2119">[RFC2119]</dt><dd>S. Bradner. <a href="http://www.ietf.org/rfc/rfc2119.txt"><cite>Key words for use in RFCs to Indicate Requirement Levels.</cite></a> March 1997. Internet RFC 2119. URL: <a href="http://www.ietf.org/rfc/rfc2119.txt">http://www.ietf.org/rfc/rfc2119.txt</a>
+</dd></dl></section></section></body></html>
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