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  • 麻将游戏下载免费:Video Introduction to Web Accessibility and W3C Standards

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    Audio Description

    This video does not include audio description because the visuals only support the audio and do not provide additional information. In this case, audio description would be more distracting than useful to most people, including people who cannot see the visuals. The Transcript with Description below includes descriptions of the supporting visuals.

    If you want examples of videos with audio description, see Web Accessibility Perspectives - Audio Described (YouTube playlist). Or you can select one of the videos on the Web Accessibility Perspectives web page and select “Enable Audio Description”.

    Text Transcript with Description of Visuals

    Audio Visual
    Hi! My name is Shadi Abou-Zahra. I'm the Accessibility Strategy and Technology Specialist at W3C, the World Wide Web Consortium, and today I'd like to tell you about web accessibility. Web Accessibility
    [Shadi speaking]
    The Web is for many people an essential part of daily life. People in an Internet cafe
    At work. Someone in an office using a computer
    At home. Someone sitting in a sofa using a laptop
    And on the road. Someone using a mobile phone while walking
    Web accessibility means that people with disabilities can use the Web equally. [Shadi speaking]
    For example, somebody who cannot use their arms, and uses a mouthstick to type. Someone using a mouthstick to type
    Or someone who cannot hear well, and uses captions to watch videos. Someone using a hearing aid
    Or someone who cannot see well, and uses a screen reader to read aloud what's on the screen. Someone using a screen reader
    Accessibility has many benefits. [Shadi speaking]
    For example, captions benefit anyone in a loud or in a quiet environment. Someone watching a video with captions in an office
    And good color contrast works better when there is glare. Someone looking at a mobile phone with glare on the screen
    Also people with age-related impairments, such as reduced dexterity, benefit. Someone with tremors using a mouse with difficulty
    In fact, everyone has a better user experience with an improved layout and design. Two people smiling happily at a well-designed website
    A lot of accessibility can be built into the underlying code of websites and applications. [Shadi speaking]
    Web technologies from W3C, such as HTML, provide many accessibility features. HTML code of a web page
    For example, to provide textual descriptions for images, which are read aloud by screen readers and also used by search engines. Example code
    Also headings, labels, and other code supports accessibility and improves the quality overall. Example code
    Good authoring tools, such as wikis, content management systems, and code editors, help create accessible code - either automatically or with input from the author. Example authoring tool used to create web content
    Also web browsers, media players, and apps need to support accessibility features. Example web browser used to show web content
    W3C provides standards to help make the Web accessible, which are internationally recognized by governments and businesses. [Shadi speaking]
    Most well-known is the Web Content Accessibility Guidelines - WCAG. WCAG is also ISO 40500, and adopted in the European standard called EN 301 549. It is built around four core principles: Web Content Accessibility Guidelines - WCAG; ISO 40500; EN 301 549
    First, Perceivable - for example, so people can see the content, or hear it. Someone typing on their tablet computer and listening to it with headphones
    Operable - for example, so people can use the computer by typing, or by voice. Someone speaking to their computer
    Understandable - for example, so people get clear and simple language. Two people looking confused at the computer screen with a dense website
    And Robust - so people can use different assistive technologies. Someone using screen magnification on a large computer screen
    Besides WCAG, W3C also provides the Authoring Tool Accessibility Guidelines - ATAG, which defines requirements for code management systems, code editors, and other software. Authoring Tool Accessibility Guidelines - ATAG
    And the User Agent Accessibility Guidelines - UAAG, defines requirements for web browsers and media players. User Agent Accessibility Guidelines - UAAG
    There are over one billion people with disabilities, or about 15-20% of the population. The UN Convention on the Rights of Persons with Disabilities defines that access to information, including the Web, as a human right. Most countries around the world have ratified this UN convention, and several have adopted binding policies too. Yet regardless of any laws and regulations, implementing the accessibility standards is essential for people with disabilities, and useful for all. [Shadi speaking]
    For more information on web accessibility, visit w3.org/WAI W3C Web Accessibility Initiative
    w3.org/WAI

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  • 回复@老老保老张工:那咋分配呢? 2019-11-17
  • 工信部:鼓励婴幼儿配方乳企质量安全追溯体系建设 2019-11-17
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