1、 IEC 62766-5-2 Edition 1.0 2017-07 INTERNATIONAL STANDARD Consumer terminal function for access to IPTV and open internet multimedia services Part 5-2: Web standards TV profile IEC 62766-5-2:2017-07(en) THIS PUBLICATION IS COPYRIGHT PROTECTED Copyright 2017 IEC, Geneva, Switzerland All rights reserv
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11、 Part 5-2: Web standards TV profile INTERNATIONAL ELECTROTECHNICAL COMMISSION ICS 33.170 35.240.95 ISBN 978-2-8322-4621-4 Registered trademark of the International Electrotechnical Commission Warning! Make sure that you obtained this publication from an authorized distributor. 2 IEC 62766-5-2:2017 I
12、EC 2017 CONTENTS FOREWORD . 4 INTRODUCTION . 6 1 Scope 7 2 Normative references 7 3 Terms, definitions and abbreviated terms 9 3.1 Terms and definitions 9 3.2 Abbreviated terms . 10 4 Overview . 10 4.1 General . 10 4.2 Markup . 10 5 Style 10 5.1 General . 10 5.2 Basic graphic 11 5.3 Device adaptatio
13、n, layout and processing . 11 5.4 Text and fonts . 11 5.5 Advanced graphic . 11 6 Scripting 12 6.1 General . 12 6.2 ECMAScript 12 6.3 Event model 12 6.4 CSSOM view . 17 7 Application APIs 17 8 Media formats and protocols Media fragment URI 17 9 Memory usage . 17 Annex A (normative) Support tables .
14、19 A.1 General . 19 A.2 HTML5 profile . 19 A.2.1 Elements . 19 A.2.2 Global attributes 27 A.2.3 Web applications APIs . 30 A.3 CSS3 profile . 33 A.3.1 General . 33 A.3.2 CSS basic user interface . 33 A.3.3 CSS image values and replaced content 36 A.3.4 CSS backgrounds and borders 36 A.3.5 CSS fonts
15、module level 3 . 36 A.3.6 CSS text level 3 . 37 A.3.7 CSS transforms . 37 A.3.8 CSS transitions 37 A.4 Web APIs profile . 39 A.4.1 XMLHttpRequest . 39 A.4.2 Web workers 39 A.4.3 Canvas 2D . 39 Bibliography 43 IEC 62766-5-2:2017 IEC 2017 3 Table 1 Virtual keycode values 13 Table 2 Minimum memory requ
16、irements . 18 Table A.1 HTML elements 20 Table A.2 Global attributes 27 Table A.3 Web applications APIs . 30 Table A.4 Media APIs 31 Table A.5 Media element events 33 Table A.6 CSS basic user interface properties and values . 34 Table A.7 User interface pseudo classes . 36 Table A.8 CSS transitions
17、38 Table A.9 HTMLCanvasElement 39 Table A.10 TextMetrics 40 Table A.11 CanvasGradient . 40 Table A.12 CanvasRenderingContext2D 41 4 IEC 62766-5-2:2017 IEC 2017 INTERNATIONAL ELECTROTECHNICAL COMMISSION _ CONSUMER TERMINAL FUNCTION FOR ACCESS TO IPTV AND OPEN INTERNET MULTIMEDIA SERVICES Part 5-2: We
18、b standards TV profile FOREWORD 1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising all national electrotechnical committees (IEC National Committees). The object of IEC is to promote international co-operation on all questions concerning
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28、is drawn to the possibility that some of the elements of this IEC Publication may be the subject of patent rights. IEC shall not be held responsible for identifying any or all such patent rights. International Standard IEC 62766 has been prepared by IEC technical committee 100: Audio, video and mult
29、imedia systems and equipment The text of this International Standard is based on the following documents: CDV Report on voting 100/2549/CDV 100/2663/RVC Full information on the voting for the approval of this International Standard can be found in the report on voting indicated in the above table. T
30、his document has been drafted in accordance with the ISO/IEC Directives, Part 2. IEC 62766-5-2:2017 IEC 2017 5 A list of all parts in the IEC 62766 series, published under the general title Consumer terminal function for access to IPTV and open Internet multimedia services, can be found on the IEC w
31、ebsite. The committee has decided that the contents of this document will remain unchanged until the stability date indicated on the IEC website under “http:/webstore.iec.ch“ in the data related to the specific document. At this date, the document will be reconfirmed, withdrawn, replaced by a revise
32、d edition, or amended. A bilingual version of this publication may be issued at a later date. 6 IEC 62766-5-2:2017 IEC 2017 INTRODUCTION The IEC 62766 series is based on a series of specifications that was originally developed by the OPEN IPTV FORUM (OIPF). They specify the user-to-network interface
33、 (UNI) for consumer terminals to access IPTV and open internet multimedia services over managed or non-managed networks as defined by OIPF. IEC 62766-5-2 will be updated over time, as maturity of different standards (now works in progress) increase and/or new web standards are defined. This document
34、 is organized as follows: the main body includes a list of references to specifications upon which the defined profile relies and that are considered necessary to enable an enhanced user experience. Annex A contains instead a detailed list of which features for each specification are considered stab
35、le enough and therefore can be safely supported by terminals and used by application developers. Such tables will be updated in future revisions of this document as maturity of the various specifications evolve. Support tables are omitted for those specifications that are required to be fully suppor
36、ted. IEC 62766-5-2:2017 IEC 2017 7 CONSUMER TERMINAL FUNCTION FOR ACCESS TO IPTV AND OPEN INTERNET MULTIMEDIA SERVICES Part 5-2: Web standards TV profile 1 Scope This part of IEC 62766 specifies a profile of HTML5, CSS and other related web technologies for connected TVs. Its goal is to describe a c
37、ommon profile that can be relied on by content and service providers and implemented by manufacturers. It does not describe extensions or modification to any of the referenced technologies but only tries to define a subset of web standards that are suitable and useful for TV deployments and at the s
38、ame time stable enough to provide a good degree of confidence that real interoperability can be achieved. It may add clarifications and/or additional constraints where these are needed due to the nature of the target deployment environment. This part of IEC 62766 only describes a minimum subset of w
39、eb technology that a terminal compliant with this profile is required to support. This does not preclude terminals to support more technologies than the ones described in this profile. 2 Normative references The following documents, in whole or in part, are normatively referenced in this document an
40、d are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. IEC 62766-1, Open IPTV Forum (OIPF) consumer terminal function and network interfaces for access to
41、 IPTV and open Internet multimedia services Part 1: General IETF RFC 6265, HTTP State Management Mechanism; Adam Barth, April 2011 IETF RFC 6455, The WebSocket Protocol; I. Fette, A. Melnikov, December 2011 including verified errata W3C Recommendation, CSS 2.1 Cascading Style Sheets; Bert Bos, Tante
42、k elik, Ian Hickson, Hkon Wium Lie, 7 June 2011. Available from: http:/www.w3.org/TR/2011/REC-CSS2- 20110607/ W3C Recommendation, CSS Color Module Level 3; Tantek elik, Chris Lilley, L. David Baron, 7 June 2011. Available from http:/www.w3.org/TR/2011/REC-css3-color-20110607/ W3C Recommendation, Med
43、ia Fragments URI 1.0 (basic); Raphal Troncy et al, 25 September 2012. Available from http:/www.w3.org/TR/2012/REC-media-frags-20120925/ W3C Recommendation, Media Queries; Hkon Wium Lie; Tantek elik; Daniel Glazman; Anne van Kesteren, 19 June 2012. Available from http:/www.w3.org/TR/2012/REC-css3- me
44、diaqueries-20120619/ W3C Recommendation, Selectors API Level 3; Daniel Glazman et al., 29 September 2011. Available from http:/www.w3.org/TR/2011/REC-css3-selectors-20110929/ 8 IEC 62766-5-2:2017 IEC 2017 W3C Recommendation, Web Storage; Ian Hickson, 30 July 2013. Available from http:/www.w3.org/TR/
45、2013/REC-webstorage-20130730/ W3C Recommendation, WOFF File Format 1.0; Jonathan Kew, Tal Leming, Erik van Blokland, 13 December 2012. Available from http:/www.w3.org/TR/2012/REC-WOFF-20121213/ W3C, ECMAScript Language Specification, Edition 5.1, June 2011. Available from http:/www.ecma-internationa
46、l.org/publications/standards/Ecma-262.htm W3C Candidate Recommendation, CSS Backgrounds and Borders Module Level 3; Bert Bos, Elika J. Etemad, Brad Kemper, 24 July 2012. Available from http:/www.w3.org/TR/2012/CR- css3-background-20120724/ W3C Candidate Recommendation, CSS Image Values and Replaced
47、Content; Elika J. Etemad, Tab Atkins Jr., 17 April 2012. Available from http:/www.w3.org/TR/2012/CR-css3-images- 20120417 W3C Candidate Recommendation, CSS Flexible Box Layout Module, Tab Atkins Jr., Elika J. Etemad, Alex Mogilevsky, 18 September 2012. Available from http:/www.w3.org/TR/2012/CR- css
48、3-flexbox-20120918/ W3C Candidate Recommendation, CSS3 Module: Multi-column layout; Hkon Wium Lie, 12 April 2011. Available from http:/www.w3.org/TR/2011/CR-css3-multicol-20110412/ W3C Candidate Recommendation, HTML Canvas 2D Context; Rik Cabanier, Eliot Graff, Jay Munro, Tom Wiltzius, Ian Hickson,
49、17 December 2012. Available from http:/www.w3.org/TR/2012/CR-2dcontext-20121217 W3C Candidate Recommendation, HTML5; Robin Berjon, Steve Faulkner, Travis Leithead, Erika Doyle Navara, Edward OConnor, Silvia Pfeiffer, 6 August 2013. Available from http:/www.w3.org/TR/2013/CR-html5-20130806/ W3C Candidate Recommendation, HTML5 Web Messaging; Ian Hickson, 01 May 2012. Available from http:/www.w3.org/TR/2012/CR-webmessaging-20120501 W3C Candidate Recommendation,
