The W3C HTML5 Specification (Working Draft) explicitly recognizes this and provides detailed examples for alt text depending on the function and context of the image.
W3C的HTML5规范(草案)明确指出了这一点，并详细示范了如何撰写基于功能和上下文的替换文本。
Along with the input string, the SUBSTRING function has three other arguments, which are start position, length, and code unit specification.
除了输入字符串之外，SUBSTRING函数还有其他三个参数，它们分别是：起始位置、长度和代码单元指定。
"Tells us that the bind will be made asynchronously, and the ReadAsync function provides the specification of how the BeginRead and EndRead methods should be called."
告诉我们，接下来的赋值过程将使用异步的方式，而ReadAsync函数为BeginRead和EndRead方法如何被调用提供了规范。
Rule, function, and specification description values should be surrounded by double-quotes (") if the values contain a comma.
如果值包含逗号的话，规则、功能和说明值应当使用双引号（"）包围起来。
Many features were introduced in the XSLT 2.0 specification-features like function definitions, multiple result documents, sequences and temporary trees, stronger typing, and text parsing.
XSLT 2.0规范引入了很多特性，比如函数定义、多结果文档、序列和临时树、更强的类型设置以及文本分析。
The built-in Concat function supports the specification of a prefix, postfix, and delimiters through its property page.
内置的Concat函数支持通过其属性页指定前缀、后缀和分隔符。
Furthermore, it illuminates how to use VDM technology to develop program, and program testifying with function and operation formational specification with a instance.
然后通过一个应用实例来说明如何利用VDM技术进行软件开发，及利用函数与操作的形式化规格说明来证明程序是正确的。
The product shall be of HART communication function, and measuring scope shall meet the demand of measuring scope required in Technical Specification .
必须具有HART通讯功能，测量范围必须满足技术规格书对测量范围的要求。
There shall be detailed specification of function, performance and price of the product in application report.
呈批件中必须详细说明该固定资产用途、性能、价格。
Master the basic theory and method of management , they are familiar with the function, the basic business process and management specification of enterprise management ;
掌握基本的管理理论及方法，熟悉企业管理的管理职能、基本业务流程与管理规范；
Ps:Regarding other specification , configuration and function, should consult with technique department of our company.
说明：对于其他的价格，配置和功能应事先征询公司技术部门。
This paper suggests the method by which function point estimates the size and software requirement specification in the developing process based on TSP;
本文介绍了在基于TSP的开发过程中，利用功能点对有效规模、需求说明书进行估计的方法；
This article emphatically introduced the video capture technology implementation and the main function and the technical specification taking PC machine as hardware environment video capture card.
本文着重介绍了视频采集技术的实施，及以PC机为硬件环境的视频采集卡的主要功能和技术指标。
The paper makes a detailed analysis of and introduction to the technical specification and function implementation of the system.
文中对系统的技术指标和功能实现，做了详尽的分析和介绍。
A three-phase signal source generator based on single-chip microprocessor is presented in this paper…The function , technical specification , hardware and software are explained in detail.
简要叙述单片机三相信号发生器的设计思想和开发方法，并对系统的功能，技术指标，硬件电路，软件设计，及使用方法作了说明。
Based on Bluetooth Specification 1.2, we explain the intact frame and function of Bluetooth protocol suites, sum up ideas of Bluetooth programming.
以蓝牙规范1.2版本为基础，阐述了蓝牙规范的完整框架和蓝牙协议栈的功能，归纳出蓝牙协议栈的结构特点。
A scheme of temporal specification using function construct of classical B AMN is proposed to support specification and verification of real-time software system.
提出一套利用B方法中经典AMN记号表达时态规约的函数结构方案以支持实时软件系统的规约和验证。
Through operating proving, the main technical specification of the testing machine was satisfied and its main function was realized after the control system.
经运行验证，控制系统完全能满足试验机的主要技术指标要求，并实现其主要功能。
The testing result discloses that the drift and diffusion function are nonlinear, and the distribution of interest rate does not follow the specification in the parametric models.
结果显示，短期利率扩散过程的漂移函数和扩散函数都是非线性的，短期利率的概率分布不服从参数模型所假设的分布。
Its basic function is to assist system analyst to analyze the requirement of the developed system, and to get an intact and accurate software requirement specification which is made up of Data Fl.
需求分析工具用于软件工程的需求分析阶段，它的基本功能是辅助系统分析人员对开发的系统需求进行分析，最终得到由数据流图和数据字典组成的完整而准确的软件需求规约。
Based on IEEE standard and domestic and overseas engineering practice, the fallback system is studied in detail. The definition, function, operational principle and design specification are presented.
本文在结合IEEE标准以及国内外的工程实践的基础上，对后备系统进行了深入地研究，给出了后备系统的定义、功能、工作原理、设计要求。
Mapping scalar value into a color specification and an opacity value, transfer function could highlight specific structure.
传递函数将体数据灰度值映射为颜色和不透明度，来突出显示特定的组织结构。
1 purchase of any fixed asset requires approval by general manager on application report. there shall be detailed specification of function, performance and price of the product in application report.
公司有关部门如需添置固定资产，必须填写呈批件报总经理批准。呈批件中必须详细说明该固定资产用途、性能、价格。
The current situation of the on board ticketing system and the technical specification and function of BST 001 portable ticketing terminal are introduced in this paper.
介绍了当前车上补票的现状和便携售票终端BST - 0 0 1的设计、主要功能和技术指标。
Raised when a function or method is invoked and at least one of the passed arguments does not meet the parameter specification of the called function or method.
在调用函数或方法，且传递的参数中至少有一个不符合被调函数或方法的参数规范时引发。
Raised when a function or method is invoked and at least one of the passed arguments does not meet the parameter specification of the called function or method.
在调用函数或方法，且传递的参数中至少有一个不符合被调函数或方法的参数规范时引发。
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