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Copyright © 2021 W3C® (MIT, ERCIM, Keio, Beihang). W3C liability, trademark and permissive document license rules apply. This specification defines a concrete sensor interface to monitor the ambient light level or illuminance of the device’s environment. This section describes the status of this document at the time of its publication. Other documents may supersede this document. motion sensor light switch was published by the Devices and Sensors Working Group as a Working Draft. This document is intended to become a W3C Recommendation. …summary of comment…”. All comments are welcome. 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. This document was produced by a group operating under the W3C Patent Policy. W3C maintains a public list of any patent disclosures 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 Essential Claim(s) must disclose the information in accordance with section 6 of the W3C Patent Policy. This document is governed by the 15 September 2020 W3C Process Document. The Devices and Sensors Working Group is pursuing modern security and privacy reviews for this specification in consideration of the amount of change in both this specification and in privacy and security review practices since the horizontal reviews took place. Similarly, the group is pursuing an update to the Technical Architecture Group review for this specification to account for the latest architectural review practices. ’s main light detector, in terms of lux units. This document specifies an API designed for use cases which require fine grained illuminance data, with low latency, and possibly sampled at high frequencies. Note: it might be worthwhile to provide a high-level Light Level Sensor which would mirror the light-level media feature, but in JavaScript. This sensor would not require additional user permission to be activated in user agents that exposed the light-level media feature. Ambient Light Sensor provides information about lighting conditions near the device environment. Profiling. Ambient Light Sensor can leak information about user’s use patterns and surrounding. This information can be used to enhance user profiling and behavioral analysis. Cross-device linking. Two devices can access web sites that include the same third-party script that correlates lighting levels over time. Cross-device communication. A simple broadcast communication method can use device screen or camera LED flashes to broadcast messages read out with an Ambient Light Sensor in a close by device. Cross-origin leaks. Light emitted from the screen can be reflected back to the sensor from nearby reflective surfaces. Malicious sites can embed resources from different origins and scale the content to display particular pixels to allow distinguishing the contents, pixel by pixel. Hijacking browsing history. Styling visited links to allow distinguishing the light levels associated with visited and unvisited links i.e. visited links styled as a block of black screen; white for unvisited. The Ambient Light Sensor sensor type’s associated Sensor subclass is the AmbientLightSensor class. The Ambient Light Sensor has a default sensor, which is the device’s main light detector. The Ambient Light Sensor has an associated sensor permission name which is "ambient-light-sensor". The current light level or illuminance is a value that represents the ambient light level around the hosting device. To construct an AmbientLightSensor object the user agent must invoke the construct an ambient light sensor object abstract operation. The illuminance attribute of the AmbientLightSensor interface represents the current light level and returns the result of invoking get value from latest reading with this and "illuminance" as arguments. 1. Let allowed be the result of invoking check sensor policy-controlled features with AmbientLightSensor. 1. Throw a SecurityError DOMException. A Web application provides input for a smart home system to control lighting. A Web aplication checks whether light level at work space is sufficient. A Web application calculates settings for a camera with manual controls (aperture, shutter speed, ISO). A Web application monitors light level changes produced by hovering hand user gesture and interprets them to control a game character. While some of the use cases may benefit from obtaining precise ambient light measurements, the use cases that convert ambient light level fluctuations to user input events would benefit from higher sampling frequencies. Doug Turner for the initial prototype and Marcos Caceres for the test suite. Paul Bakaus for the LightLevelSensor idea. Mikhail Pozdnyakov and Alexander Shalamov for the use cases and requirements. Lukasz Olejnik for the privacy risk assessment. Conformance requirements are expressed with a combination of descriptive assertions and RFC 2119 terminology. The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in the normative parts of this document are to be interpreted as described in RFC 2119. However, for readability, these words do not appear in all uppercase letters in this specification. All of the text of this specification is normative except sections explicitly marked as non-normative, examples, and notes. A conformant user agent must implement all the requirements listed in this specification that are applicable to user agents. The IDL fragments in this specification must be interpreted as required for conforming IDL fragments, as described in the Web IDL specification.

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