--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/light/LC2-diff.html Mon Jun 16 10:10:56 2014 +0300
@@ -0,0 +1,3263 @@
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+</head>
+<body class="h-entry" role="document" id="respecDocument">
+<div class="head" role="contentinfo" id="respecHeader">
+<p>
+<a href="http://www.w3.org/">
+<img width="72" height="48" src="https://www.w3.org/Icons/w3c_home" alt="W3C">
+</a>
+</p>
+<h1 class="title p-name" id="title" property="dcterms:title">
+Ambient
+Light
+Events
+</h1>
+<h2 property="dcterms:issued" datatype="xsd:dateTime" content="2014-06-18T21:00:00.000Z" id="w3c-last-call-working-draft-19-june-2014">
+<abbr title="World Wide Web Consortium">
+W3C
+</abbr>
+<del class="diff-old">Candidate
+Recommendation
+01
+October
+2013
+</del>
+<ins class="diff-chg">Last
+Call
+Working
+Draft
+</ins><time class="dt-published" datetime="2014-06-19"><ins class="diff-chg">
+19
+June
+2014
+</ins>
+</time>
+</h2>
+<dl>
+<dt>
+This
+version:
+</dt>
+<dd>
+<del class="diff-old">http://www.w3.org/TR/2013/CR-ambient-light-20131001/
+</del>
+<a class="u-url" href="http://www.w3.org/TR/2014/WD-ambient-light-20140619/">
+<ins class="diff-chg">http://www.w3.org/TR/2014/WD-ambient-light-20140619/
+</ins>
+</a>
+</dd>
+<dt>
+Latest
+published
+version:
+</dt>
+<dd>
+<a href="http://www.w3.org/TR/ambient-light/">
+http://www.w3.org/TR/ambient-light/
+</a>
+</dd>
+<dt>
+Latest
+editor's
+draft:
+</dt>
+<dd>
+<a href="http://dvcs.w3.org/hg/dap/raw-file/default/light/Overview.html">
+http://dvcs.w3.org/hg/dap/raw-file/default/light/Overview.html
+</a>
+</dd>
+<dt>
+Test
+suite:
+</dt>
+<dd>
+<del class="diff-old">https://w3c-test.org/web-platform-tests/master/ambient-light/
+</del>
+<a href="http://w3c-test.org/ambient-light/">
+<ins class="diff-chg">http://w3c-test.org/ambient-light/
+</ins>
+</a>
+</dd>
+<dt>
+Previous
+version:
+</dt>
+<dd>
+<del class="diff-old">http://www.w3.org/TR/2012/WD-ambient-light-20121213/
+</del>
+<a rel="dcterms:replaces" href="http://www.w3.org/TR/2013/CR-ambient-light-20131001/">
+<ins class="diff-chg">http://www.w3.org/TR/2013/CR-ambient-light-20131001/
+</ins>
+</a>
+</dd>
+<dt>
+Editors:
+</dt>
+<dd class="p-author h-card vcard" rel="bibo:editor" inlist="">
+<span typeof="foaf:Person">
+<span property="foaf:name" class="p-name fn">
+Doug
+Turner
+</span>,
+<a rel="foaf:workplaceHomepage" class="p-org org h-org h-card" href="http://mozilla.com/">
+Mozilla
+Corporation
+</a>
+</span>
+</dd>
+<dd class="p-author h-card vcard" rel="bibo:editor" inlist="">
+<span typeof="foaf:Person">
+<span property="foaf:name" class="p-name fn">
+Anssi
+Kostiainen
+</span>,
+<a rel="foaf:workplaceHomepage" class="p-org org h-org h-card" href="http://intel.com/">
+Intel
+</a>
+</span>
+</dd>
+<dt>
+Revision
+history:
+</dt>
+<dd>
+<a href="https://dvcs.w3.org/hg/dap/log/default/light/Overview.src.html">
+https://dvcs.w3.org/hg/dap/log/default/light/Overview.src.html
+</a>
+</dd>
+</dl>
+<p class="copyright">
+<a href="http://www.w3.org/Consortium/Legal/ipr-notice#Copyright">
+Copyright
+</a>
+©
+<del class="diff-old">2013
+</del>
+<ins class="diff-chg">2014
+</ins>
+<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>,
+<a href="http://ev.buaa.edu.cn/">
+Beihang
+</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" property="dcterms:abstract" datatype typeof="bibo:Chapter" resource="#abstract" rel="bibo:Chapter">
+<h2 aria-level="1" role="heading" id="h2_abstract">
+Abstract
+</h2>
+<p>
+This
+specification
+defines
+a
+means
+to
+receive
+events
+that
+correspond
+to
+a
+light
+sensor
+detecting
+the
+presence
+of
+a
+light.
+</p>
+</section>
+<section id="sotd" class="introductory" typeof="bibo:Chapter" resource="#sotd" rel="bibo:Chapter">
+<h2 aria-level="1" role="heading" id="h2_sotd">
+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
+<ins class="diff-new">following
+changes
+have
+been
+made
+since
+the
+</ins><a href="http://www.w3.org/TR/2013/CR-ambient-light-20131001/"><abbr title="World Wide Web Consortium"><ins class="diff-new">
+W3C
+</ins></abbr><ins class="diff-new">
+Candidate
+Recommendation
+01
+October
+2013
+</ins></a>:</p><ul><li><ins class="diff-new">
+Removed
+the
+</ins><a href="http://www.w3.org/TR/2013/CR-ambient-light-20131001/#lightlevelevent-interface"><code><ins class="diff-new">
+LightLevelEvent
+</ins></code></a><ins class="diff-new">
+interface
+to
+align
+with
+implementations.
+</ins></li><li><ins class="diff-new">
+Updated
+the
+</ins><a href="#terminology"><ins class="diff-new">
+Terminology
+</ins></a>,<a href="#security-and-privacy-considerations"><ins class="diff-new">
+Security
+and
+privacy
+considerations
+</ins></a><ins class="diff-new">
+and
+</ins><a href="#introduction"><ins class="diff-new">
+Introduction
+</ins></a><ins class="diff-new">
+sections
+accordingly.
+</ins></li></ul><p><ins class="diff-new">
+The
+</ins>
+functionality
+described
+in
+this
+specification
+was
+initially
+specified
+as
+part
+of
+the
+<a href="http://dvcs.w3.org/hg/dap/raw-file/default/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>
+<del class="diff-old">Changes
+since
+Last
+Call
+include
+addition
+of
+a
+new
+security
+considerations
+section,
+clarification
+of
+lux
+level
+light
+values,
+clarifications
+to
+the
+text
+and
+processing
+description
+and
+updated
+references
+and
+the
+addition
+of
+a
+WebIDL
+reference.
+These
+changes
+include
+updates
+to
+address
+Last
+Call
+comments
+that
+were
+received
+(
+disposition
+of
+comments
+).
+A
+diff
+showing
+changes
+since
+the
+Last
+Call
+publication
+is
+available
+(
+diff
+).
+The
+CR
+exit
+criterion
+is
+two
+interoperable
+deployed
+implementations
+of
+each
+feature,
+with
+no
+features
+marked
+as
+'at-risk'.
+The
+group
+will
+create
+an
+Implementation
+Report
+.
+</del>
+This
+document
+was
+published
+by
+the
+<a href="http://www.w3.org/2009/dap/">
+Device
+APIs
+Working
+Group
+</a>
+as
+a
+<del class="diff-old">Candidate
+Recommendation.
+</del>
+<ins class="diff-chg">Last
+Call
+Working
+Draft.
+</ins>
+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>
+).
+<del class="diff-old">W3C
+publishes
+a
+Candidate
+Recommendation
+to
+indicate
+that
+the
+document
+is
+believed
+to
+be
+stable
+and
+to
+encourage
+implementation
+by
+the
+developer
+community.
+This
+Candidate
+Recommendation
+is
+expected
+to
+advance
+to
+Proposed
+Recommendation
+no
+earlier
+than
+21
+November
+2013.
+</del>
+<ins class="diff-chg">The
+Last
+Call
+period
+ends
+24
+July
+2014.
+</ins>
+All
+comments
+are
+welcome.
+</p>
+<p>
+Publication
+as
+a
+<del class="diff-old">Candidate
+Recommendation
+</del>
+<ins class="diff-chg">Last
+Call
+Working
+Draft
+</ins>
+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
+<ins class="diff-new">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.
+</ins></p><p><ins class="diff-new">
+This
+</ins>
+document
+was
+produced
+by
+a
+group
+operating
+under
+the
+<a id="sotd_patent" about="" rel="w3p:patentRules" 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" aria-level="1" role="heading" id="h2_toc">
+Table
+of
+Contents
+</h2>
+<ul class="toc" role="directory" id="respecContents">
+<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-light" class="tocxref">
+<span class="secno">
+5.
+</span>
+Device
+Light
+</a>
+<ul class="toc">
+<li class="tocline">
+<a href="#extensions-to-window-interface" class="tocxref">
+<span class="secno">
+5.1
+</span>
+<ins class="diff-new">Extensions
+to
+</ins>
+<span class="formerLink">
+<code>
+<del class="diff-old">DeviceLightEvent
+</del>
+<ins class="diff-chg">Window
+</ins>
+</code>
+</span>
+Interface
+</a>
+<del class="diff-old">5.1.1
+Event
+handlers
+</del>
+</li>
+<del class="diff-old">6.
+Light
+Level
+</del>
+<li class="tocline">
+<a href="#devicelightevent-interface" class="tocxref">
+<span class="secno">
+<del class="diff-old">6.1
+</del>
+<ins class="diff-chg">5.2
+</ins>
+</span>
+<span class="formerLink">
+<code>
+<del class="diff-old">LightLevelEvent
+</del>
+<ins class="diff-chg">DeviceLightEvent
+</ins>
+</code>
+</span>
+Interface
+</a>
+<ul class="toc">
+<li class="tocline">
+<a href="#event-handlers" class="tocxref">
+<span class="secno">
+<del class="diff-old">6.1.1
+</del>
+<ins class="diff-chg">5.2.1
+</ins>
+</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>
+<li class="tocline">
+<a href="#informative-references" class="tocxref">
+<span class="secno">
+<ins class="diff-new">B.2
+</ins></span><ins class="diff-new">
+Informative
+references
+</ins></a></li>
+</ul>
+</li>
+</ul>
+</section>
+<section class="informative" id="introduction">
+<h2 aria-level="1" role="heading" id="h2_introduction">
+<span class="secno">
+1.
+</span>
+Introduction
+</h2>
+<p>
+<em>
+This
+section
+is
+non-normative.
+</em>
+</p>
+<p>
+<del class="diff-old">This
+specification
+defines
+events
+that
+provide
+information
+about
+the
+ambient
+light
+level,
+as
+measured
+by
+a
+device's
+light
+sensor.
+A
+LightLevelEvent
+describes
+the
+light
+level
+as
+one
+of
+three
+simple
+categories
+-
+"dim",
+"normal",
+and
+"bright"
+-
+while
+a
+</del>
+<ins class="diff-chg">The
+</ins>
+<a href="#idl-def-DeviceLightEvent" class="idlType">
+<code>
+DeviceLightEvent
+</code>
+</a>
+<ins class="diff-new">interface
+</ins>
+provides
+<del class="diff-old">a
+more
+granular
+answer
+</del>
+<ins class="diff-chg">information
+about
+the
+ambient
+light
+levels,
+as
+detected
+</ins>
+by
+<del class="diff-old">describing
+</del>
+the
+<ins class="diff-new">device's
+</ins>
+light
+<del class="diff-old">level
+</del>
+<ins class="diff-chg">detector,
+</ins>
+in
+terms
+of
+lux
+units.
+</p>
+<p>
+<ins class="diff-new">The
+</ins><a href="http://dev.w3.org/csswg/mediaqueries4/#light-level"><ins class="diff-new">
+'light-level'
+media
+feature
+</ins></a><ins class="diff-new">
+[
+</ins><cite><a class="bibref" href="#bib-mediaqueries4"><ins class="diff-new">
+mediaqueries4
+</ins></a></cite><ins class="diff-new">
+]
+provides
+more
+granular,
+less
+precise,
+information
+about
+the
+ambient
+light
+level.
+</ins></p>
+</section>
+<section id="conformance" typeof="bibo:Chapter" resource="#conformance" rel="bibo:Chapter">
+<h2 aria-level="1" role="heading" id="h2_conformance">
+<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>
+<p>
+Implementations
+that
+use
+ECMAScript
+to
+implement
+the
+APIs
+defined
+in
+this
+specification
+must
+implement
+them
+in
+a
+manner
+consistent
+with
+the
+ECMAScript
+Bindings
+defined
+in
+the
+Web
+IDL
+specification
+[
+<cite>
+<a class="bibref" href="#bib-WEBIDL">
+WEBIDL
+</a>
+</cite>
+],
+as
+this
+specification
+uses
+that
+specification
+and
+terminology.
+</p>
+</section>
+<section id="terminology">
+<h2 aria-level="1" role="heading" id="h2_terminology">
+<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
+<a href="http://www.w3.org/TR/WebIDL/#idl-callback-functions">
+callback
+function
+</a>
+used
+for
+<a href="http://dev.w3.org/html5/spec/webappapis.html#event-handlers">
+event
+handlers
+</a>
+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>,
+<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>,
+and
+<dfn id="dfn-top-level-browsing-context">
+<a href="http://dev.w3.org/html5/spec/browsers.html#top-level-browsing-context">
+top-level
+browsing
+context
+</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>
+Event
+constructor
+behavior
+is
+defined
+in
+<dfn id="dfn-constructing-events">
+<a href="http://dom.spec.whatwg.org/#constructing-events">
+constructing
+events
+</a>
+</dfn>
+chapter
+in
+[
+<cite>
+<a class="bibref" href="#bib-DOM4">
+DOM4
+</a>
+</cite>
+].
+</p>
+<p>
+The
+concepts
+<dfn id="dfn-create-an-event">
+<a href="http://dom.spec.whatwg.org/#constructing-events">
+create
+an
+event
+</a>
+</dfn>
+and
+<dfn id="dfn-fire-an-event">
+<a href="http://dom.spec.whatwg.org/#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-light-level">
+current
+light
+level
+</dfn>
+is
+a
+value
+that
+represents
+the
+ambient
+light
+levels
+around
+the
+hosting
+device
+in
+lux
+units.
+</p>
+<del class="diff-old">The
+current
+light
+level
+state
+represents
+the
+ambient
+light
+level
+around
+the
+hosting
+device
+as
+a
+human-readable
+string.
+</del>
+</section>
+<section class="informative" id="security-and-privacy-considerations">
+<h2 aria-level="1" role="heading" id="h2_security-and-privacy-considerations">
+<span class="secno">
+4.
+</span>
+Security
+and
+privacy
+considerations
+</h2>
+<p>
+<em>
+This
+section
+is
+non-normative.
+</em>
+</p>
+<p>
+Privacy
+risks
+can
+arise
+when
+this
+specification
+is
+used
+in
+combination
+with
+other
+functionality
+or
+when
+used
+over
+time,
+specifically
+with
+the
+risk
+of
+correlation
+of
+data
+and
+user
+identification
+through
+fingerprinting.
+Web
+application
+developers
+using
+these
+JavaScript
+APIs
+should
+consider
+how
+this
+information
+might
+be
+correlated
+with
+other
+information
+and
+the
+privacy
+risks
+that
+might
+be
+created.
+The
+potential
+risks
+of
+collection
+of
+such
+data
+over
+a
+longer
+period
+of
+time
+should
+also
+be
+considered.
+</p>
+<p>
+Variations
+in
+implementation
+light
+level
+values
+as
+well
+as
+event
+firing
+rates
+offer
+the
+possibility
+of
+fingerprinting
+to
+identify
+users.
+Browser
+implementations
+may
+reduce
+the
+risk
+by
+<del class="diff-old">only
+using
+the
+less
+precise
+LightLevelState
+of
+'dim',
+'normal',
+and
+'bright'
+and
+</del>
+limiting
+event
+rates
+available
+to
+web
+application
+developers.
+</p>
+<p>
+If
+the
+same
+JavaScript
+code
+using
+the
+API
+can
+be
+used
+simultaneously
+in
+different
+window
+contexts
+on
+the
+same
+device
+it
+may
+be
+possible
+for
+that
+code
+to
+correlate
+the
+user
+across
+those
+two
+contexts,
+creating
+unanticipated
+tracking
+mechanisms.
+</p>
+<p>
+Browser
+implementations
+should
+consider
+providing
+the
+user
+an
+indication
+of
+when
+the
+sensor
+is
+used
+and
+allowing
+the
+user
+to
+disable
+sensing.
+</p>
+<p>
+Web
+application
+developers
+that
+use
+this
+specification
+should
+perform
+a
+privacy
+assessment
+of
+their
+application
+taking
+all
+aspects
+of
+their
+application
+into
+consideration.
+</p>
+<p>
+The
+<del class="diff-old">events
+</del>
+<ins class="diff-chg">event
+</ins>
+defined
+in
+this
+specification
+<del class="diff-old">are
+</del>
+<ins class="diff-chg">is
+</ins>
+only
+fired
+in
+the
+<a href="#dfn-top-level-browsing-context" class="internalDFN">
+top-level
+browsing
+context
+</a>
+to
+avoid
+the
+privacy
+risk
+of
+sharing
+the
+information
+defined
+in
+this
+specification
+with
+contexts
+unfamiliar
+to
+the
+user.
+For
+example,
+a
+mobile
+device
+will
+only
+fire
+<del class="diff-old">these
+events
+</del>
+<ins class="diff-chg">the
+event
+</ins>
+on
+the
+active
+tab,
+and
+not
+on
+the
+background
+tabs
+or
+within
+iframes.
+</p>
+</section>
+<section id="device-light">
+<h2 aria-level="1" role="heading" id="h2_device-light">
+<span class="secno">
+5.
+</span>
+Device
+Light
+</h2>
+<del class="diff-old">The
+</del>
+<section id="extensions-to-window-interface">
+<h3 aria-level="2" role="heading" id="h3_extensions-to-window-interface">
+<span class="secno">
+<ins class="diff-chg">5.1
+</ins></span><ins class="diff-chg">
+Extensions
+to
+</ins><a href="#idl-def-Window" class="idlType">
+<code>
+<del class="diff-old">DeviceLightEvent
+</del>
+<ins class="diff-chg">Window
+</ins>
+</code>
+</a>
+<del class="diff-old">interface
+provides
+information
+about
+the
+ambient
+light
+levels,
+as
+detected
+by
+the
+device's
+light
+detector,
+in
+terms
+of
+lux
+units.
+</del>
+<ins class="diff-chg">Interface
+</ins></h3>
+<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">EventHandler</span> <span class="idlAttrName"><a href="#widl-Window-ondevicelight">ondevicelight</a></span>;</span>
+};</span>
+</pre>
+<p>
+The
+<code id="widl-Window-ondevicelight">
+ondevicelight
+</code>
+event
+handler
+and
+its
+corresponding
+event
+handler
+event
+type
+<code>
+devicelight
+</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>
+<section id="devicelightevent-interface">
+<h3 aria-level="2" role="heading" id="h3_devicelightevent-interface">
+<span class="secno">
+<del class="diff-old">5.1
+</del>
+<ins class="diff-chg">5.2
+</ins>
+</span>
+<a href="#idl-def-DeviceLightEvent" class="idlType">
+<code>
+DeviceLightEvent
+</code>
+</a>
+Interface
+</h3>
+<pre class="idl">
+<del class="diff-old"> {
+</del>
+<span class="idlInterface" id="idl-def-DeviceLightEvent"><span class="idlDictionary" id="idl-def-DeviceLightEventInit">dictionary <span class="idlDictionaryID">DeviceLightEventInit</span> : <span class="idlSuperclass">EventInit</span> {
+<span class="idlMember"> <span class="idlMemberType">unrestricted double</span> <span class="idlMemberName"><a href="#widl-DeviceLightEventInit-value">value</a></span>;</span>
+};</span><br><br>[<span class="extAttr">Constructor (DOMString type, optional DeviceLightEventInit eventInitDict)</span>]
+<del class="diff-old">interface {
+</del>
+<ins class="diff-chg">interface <span class="idlInterfaceID">DeviceLightEvent</span> : <span class="idlSuperclass">Event</span> {
+</ins><span class="idlAttribute"> readonly attribute <span class="idlAttrType">unrestricted double</span> <span class="idlAttrName"><a href="#widl-DeviceLightEvent-value">value</a></span>;</span>
+};</span>
+</pre>
+<p>
+The
+<code id="widl-DeviceLightEvent-value">
+value
+</code>
+<code id="widl-DeviceLightEventInit-value">
+</code>
+attribute
+of
+the
+<a href="#idl-def-DeviceLightEvent" class="idlType">
+<code>
+DeviceLightEvent
+</code>
+</a>
+interface
+<em class="rfc2119" title="MUST">
+MUST
+</em>
+return
+the
+value
+it
+was
+initialized
+to.
+When
+the
+object
+is
+created,
+this
+attribute
+<em class="rfc2119" title="MUST">
+MUST
+</em>
+be
+initialized
+to
+positive
+Infinity.
+It
+represents
+the
+<a href="#dfn-current-light-level" class="internalDFN">
+current
+light
+level
+</a>.
+</p>
+<div class="note">
+<div class="note-title" aria-level="3" role="heading" id="h_note_1">
+<span>
+Note
+</span>
+</div>
+<div class="">
+The
+precise
+lux
+value
+reported
+by
+different
+devices
+in
+the
+same
+light
+can
+be
+different,
+due
+to
+differences
+in
+detection
+method,
+sensor
+construction
+etc.
+</div>
+</div>
+<p>
+When
+a
+<a href="#dfn-user-agent" class="internalDFN">
+user
+agent
+</a>
+is
+required
+to
+<dfn id="dfn-fire-a-device-light-event">
+fire
+a
+device
+light
+event
+</dfn>,
+the
+<a href="#dfn-user-agent" class="internalDFN">
+user
+agent
+</a>
+<em class="rfc2119" title="MUST">
+MUST
+</em>
+run
+the
+following
+steps:
+</p>
+<ol class="rule">
+<li>
+<a href="#dfn-create-an-event" class="internalDFN">
+Create
+an
+event
+</a>
+that
+uses
+the
+<a href="#idl-def-DeviceLightEvent" class="idlType">
+<code>
+DeviceLightEvent
+</code>
+</a>
+interface,
+with
+the
+name
+<code>
+devicelight
+</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-light-level" class="internalDFN">
+current
+light
+level
+</a>,
+initialize
+the
+<code>
+value
+</code>
+attribute
+to
+positive
+Infinity,
+otherwise
+initialize
+the
+attribute
+to
+the
+<a href="#dfn-current-light-level" class="internalDFN">
+current
+light
+level
+</a>.
+</li>
+</ol>
+</li>
+</ol>
+<p>
+When
+the
+<a href="#dfn-current-light-level" class="internalDFN">
+current
+light
+level
+</a>
+changes,
+the
+<a href="#dfn-user-agent" class="internalDFN">
+user
+agent
+</a>
+<em class="rfc2119" title="MUST">
+MUST
+</em>
+queue
+a
+task
+to
+<a href="#dfn-fire-a-device-light-event" class="internalDFN">
+fire
+a
+device
+light
+event
+</a>
+at
+the
+<a href="#dfn-top-level-browsing-context" class="internalDFN">
+top-level
+browsing
+context
+</a>
+'s
+<a href="#idl-def-Window" class="idlType">
+<code>
+Window
+</code>
+</a>
+object.
+</p>
+<div class="note">
+<div class="note-title" aria-level="3" role="heading" id="h_note_2">
+<span>
+Note
+</span>
+</div>
+<div class="">
+The
+definition
+of
+granularity
+i.e.
+how
+often
+the
+event
+is
+fired
+is
+left
+to
+the
+implementation.
+Implementations
+can
+fire
+the
+event
+if
+they
+have
+reason
+to
+believe
+that
+the
+page
+does
+not
+have
+sufficiently
+fresh
+data.
+</div>
+</div>
+<section id="event-handlers">
+<h4 aria-level="3" role="heading" id="h4_event-handlers">
+<span class="secno">
+<del class="diff-old">5.1.1
+</del>
+<ins class="diff-chg">5.2.1
+</ins>
+</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
+<a href="#idl-def-Window" class="idlType">
+<code>
+Window
+</code>
+</a>
+object:
+</p>
+<table class="simple">
+<thead>
+<tr>
+<th>
+event
+handler
+</th>
+<th>
+event
+handler
+event
+type
+</th>
+</tr>
+</thead>
+<tbody>
+<tr>
+<td>
+<strong>
+<code>
+ondevicelight
+</code>
+</strong>
+</td>
+<td>
+<code>
+devicelight
+</code>
+</td>
+</tr>
+</tbody>
+</table>
+</section>
+</section>
+</section>
+<del class="diff-old">6.
+Light
+Level
+The
+LightLevelEvent
+interface
+provides
+information
+about
+the
+ambient
+light
+levels,
+as
+detected
+by
+the
+device's
+light
+detector,
+in
+terms
+of
+three
+general
+range:
+"dim",
+"normal",
+or
+"bright".
+The
+HTML5
+specification
+[
+HTML5
+]
+defines
+a
+Window
+interface,
+which
+this
+specification
+extends:
+ {
+};
+The
+onlightlevel
+event
+handler
+and
+its
+corresponding
+event
+handler
+event
+type
+lightlevel
+MUST
+be
+supported
+as
+an
+IDL
+attribute
+by
+all
+objects
+implementing
+the
+Window
+interface.
+6.1
+LightLevelEvent
+Interface
+ {
+ "",
+ "",
+ "",
+ ""
+}; {
+};]
+interface {
+};
+The
+value
+attribute
+of
+the
+LightLevelEvent
+interface
+MUST
+return
+the
+value
+it
+was
+initialized
+to.
+When
+the
+object
+is
+created,
+this
+attribute
+MUST
+be
+initialized
+to
+an
+empty
+string
+.
+It
+represents
+the
+current
+light
+level
+state
+.
+When
+a
+user
+agent
+is
+required
+to
+fire
+a
+light
+level
+event
+,
+the
+user
+agent
+MUST
+run
+the
+following
+steps:
+Create
+an
+event
+that
+uses
+the
+LightLevelEvent
+interface,
+with
+the
+name
+lightlevel
+,
+which
+bubbles,
+is
+not
+cancelable,
+and
+has
+no
+default
+action,
+that
+also
+meets
+the
+following
+conditions:
+If
+the
+implementation
+is
+unable
+to
+report
+the
+current
+light
+level
+state
+,
+initialize
+the
+value
+attribute
+to
+an
+empty
+string
+,
+otherwise
+initialize
+the
+attribute
+to
+the
+current
+light
+level
+state
+,
+which
+MUST
+be
+one
+of
+the
+following
+values:
+dim
+normal
+bright
+Note
+The
+lux
+ranges
+that
+map
+to
+the
+current
+light
+level
+state
+s
+are
+left
+to
+the
+implementation,
+as
+devices
+with
+different
+sensitivities
+could
+map
+them
+slightly
+differently.
+However,
+it
+is
+recommended
+that
+"
+dim
+"
+correspond
+to
+ambient
+light
+below
+50
+lux
+(dark
+enough
+that
+the
+light
+produced
+by
+a
+white
+background
+is
+eye-straining
+or
+distracting),
+"
+normal
+"
+correspond
+to
+light
+between
+50
+lux
+and
+10000
+lux
+(office
+building
+hallway,
+very
+dark
+overcast
+day,
+office
+lighting,
+sunrise
+or
+sunset
+on
+a
+clear
+day,
+overcast
+day,
+or
+similar),
+and
+"
+bright
+"
+correspond
+to
+light
+above
+10000
+lux
+(direct
+sunlight,
+or
+similarly
+bright
+conditions
+that
+make
+it
+hard
+to
+see
+things
+that
+aren't
+high-contrast).
+When
+the
+current
+light
+level
+state
+changes,
+the
+user
+agent
+MUST
+queue
+a
+task
+to
+fire
+a
+user
+proximity
+event
+at
+the
+top-level
+browsing
+context
+'s
+Window
+object.
+Note
+The
+definition
+of
+granularity
+i.e.
+how
+often
+the
+event
+is
+fired
+is
+left
+to
+the
+implementation.
+Implementations
+can
+fire
+the
+event
+if
+they
+have
+reason
+to
+believe
+that
+the
+page
+does
+not
+have
+sufficiently
+fresh
+data.
+6.1.1
+Event
+handlers
+The
+following
+are
+the
+event
+handlers
+(and
+their
+corresponding
+event
+handler
+event
+types
+)
+that
+MUST
+be
+supported
+as
+attributes
+by
+the
+Window
+object:
+event
+handler
+event
+handler
+event
+type
+onlightlevel
+lightlevel
+</del>
+<section class="appendix" id="acknowledgements">
+<h2 aria-level="1" role="heading" id="h2_acknowledgements">
+<span class="secno">
+A.
+</span>
+Acknowledgements
+</h2>
+<p>
+Doug
+Turner
+for
+the
+initial
+prototype
+and
+Marcos
+Caceres
+for
+the
+test
+suite.
+</p>
+</section>
+<section id="references" class="appendix" typeof="bibo:Chapter" resource="#references" rel="bibo:Chapter">
+<h2 aria-level="1" role="heading" id="h2_references">
+<span class="secno">
+B.
+</span>
+References
+</h2>
+<section id="normative-references" typeof="bibo:Chapter" resource="#normative-references" rel="bibo:Chapter">
+<h3 aria-level="2" role="heading" id="h3_normative-references">
+<span class="secno">
+B.1
+</span>
+Normative
+references
+</h3>
+<dl class="bibliography" about="">
+<dt id="bib-DOM4">
+[DOM4]
+</dt>
+<dd rel="dcterms:requires">
+Anne
+van
+Kesteren;
+Aryeh
+Gregor;
+<del class="diff-old">Lachlan
+Hunt;
+Ms2ger.
+</del>
+<ins class="diff-chg">Ms2ger;
+Alex
+Russell;
+Robin
+Berjon.
+</ins>
+<a href="http://www.w3.org/TR/dom/">
+<cite>
+<ins class="diff-new">W3C
+</ins>
+DOM4
+</cite>
+</a>.
+<del class="diff-old">6
+December
+2012.
+</del>
+<ins class="diff-chg">8
+May
+2014.
+</ins>
+W3C
+<del class="diff-old">Working
+Draft.
+</del>
+<ins class="diff-chg">Candidate
+Recommendation.
+</ins>
+URL:
+<a href="http://www.w3.org/TR/dom/">
+http://www.w3.org/TR/dom/
+</a>
+</dd>
+<dt id="bib-HTML5">
+[HTML5]
+</dt>
+<dd rel="dcterms:requires">
+Robin
+Berjon;
+Steve
+Faulkner;
+Travis
+Leithead;
+Erika
+Doyle
+Navara;
+Edward
+O'Connor;
+Silvia
+Pfeiffer.
+<a href="http://www.w3.org/TR/html5/">
+<cite>
+HTML5
+</cite>
+</a>.
+<del class="diff-old">6
+August
+2013.
+</del>
+<ins class="diff-chg">29
+April
+2014.
+</ins>
+W3C
+Candidate
+Recommendation.
+URL:
+<a href="http://www.w3.org/TR/html5/">
+http://www.w3.org/TR/html5/
+</a>
+</dd>
+<dt id="bib-RFC2119">
+[RFC2119]
+</dt>
+<dd rel="dcterms:requires">
+S.
+Bradner.
+<a href="http://www.ietf.org/rfc/rfc2119.txt">
+<cite>
+Key
+words
+for
+use
+in
+RFCs
+to
+Indicate
+Requirement
+<del class="diff-old">Levels.
+</del>
+<ins class="diff-chg">Levels
+</ins>
+</cite>
+</a>.
+March
+1997.
+<del class="diff-old">Internet
+RFC
+2119.
+</del>
+<ins class="diff-chg">Best
+Current
+Practice.
+</ins>
+URL:
+<a href="http://www.ietf.org/rfc/rfc2119.txt">
+http://www.ietf.org/rfc/rfc2119.txt
+</a>
+</dd>
+<dt id="bib-WEBIDL">
+[WEBIDL]
+</dt>
+<dd rel="dcterms:requires">
+Cameron
+McCormack.
+<a href="http://www.w3.org/TR/WebIDL/">
+<cite>
+Web
+IDL
+</cite>
+</a>.
+19
+April
+2012.
+W3C
+Candidate
+Recommendation.
+URL:
+<a href="http://www.w3.org/TR/WebIDL/">
+http://www.w3.org/TR/WebIDL/
+</a>
+</dd>
+</dl>
+</section>
+<section id="informative-references" typeof="bibo:Chapter" resource="#informative-references" rel="bibo:Chapter">
+<h3 aria-level="2" role="heading" id="h3_informative-references">
+<span class="secno">
+<ins class="diff-new">B.2
+</ins></span><ins class="diff-new">
+Informative
+references
+</ins></h3><dl class="bibliography" about=""><dt id="bib-mediaqueries4"><ins class="diff-new">
+[mediaqueries4]
+</ins></dt><dd rel="dcterms:references"><ins class="diff-new">
+Florian
+Rivoal;
+Tab
+Atkins
+Jr..
+</ins><a href="http://dev.w3.org/csswg/mediaqueries4/"><cite><ins class="diff-new">
+Media
+Queries
+Level
+4
+</ins></cite></a>.<ins class="diff-new">
+W3C
+Editor's
+Draft.
+URL:
+</ins><a href="http://dev.w3.org/csswg/mediaqueries4/"><ins class="diff-new">
+http://dev.w3.org/csswg/mediaqueries4/
+</ins>
+</a>
+</dd>
+</dl>
+</section>
+</section>
+</body>
+</html>
+