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无障碍 (a) 规则 - 3

Barbara Streisand
发布: 2024-11-18 20:32:02
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755 人浏览过

图片

这不仅仅是向图像添加替代文本;远不止这些。

装饰图像

  • 如果图像没有添加额外的上下文或信息(装饰图像)来让用户更好地理解上下文,那么它应该对辅助技术 (AT) 隐藏,例如屏幕阅读器。

  • 使用以下任何一种方法来隐藏 AT 中的图像:

    • 空文本替代 (alt)
    • 应用 ARIA
    • 添加图像作为 CSS 背景
<!-- All of these choices lead to the same result. -->
<img src=".../Ladybug.jpg" role="presentation">
<img src=".../Ladybug.jpg" role="none">
<img src=".../Ladybug.jpg" aria-hidden="true">
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  • 如有疑问,请为图像添加描述。

空或 null alt

  • 不要将图像 alt 属性设置为“”,除非图像纯粹是装饰性的。
Attribute Example Screen Reader Behavior Use Case
alt="" (Empty) Ignores the image completely Decorative or non-informative images
Missing alt May read the filename/URL Not recommended; implies negligence

信息丰富的图像

  • 如果图像传达概念、想法或情感,您应该包含描述图像用途的程序化替代文本。

  • 尽可能添加非常详细的图像描述。

例如

<img src=".../Ladybug_Swarm.jpg" alt="A swarm of red ladybugs is resting 
on the leaves of my prize rose bush.">
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Accessibility (a) Rules - 3

  • 如果图像是(内联),请添加 role="img"。

  • 由于元素不支持 alt 属性,请使用替代编码方法来提供描述。

Method Use Case Pros Cons
</td> <td>Short, brief descriptions</td> <td>Simple, widely supported</td> <td>Limited in length</td> </tr> <tr> <td>aria-label</td> <td>Brief descriptions</td> <td>Quick, inline</td> <td>Best for short text</td> </tr> <tr> <td>aria-labelledby</td> <td>Complex descriptions using <title> and <desc></td> <td>Comprehensive, flexible</td> <td>More verbose</td> </tr> <tr> <td><figcaption></td> <td>Visible description in a figure context</td> <td>Visible and accessible</td> <td>Not ideal for all SVGs</td> </tr> </tbody> </table></div> <h3> 功能图像 </h3> <ul> <li><p>任何具有功能性目的的图像(例如,链接到主页的徽标、用作搜索按钮的放大镜图标)都应包含适当的替代文本。</p></li> <li><p>替代文本应描述<strong>图像的操作</strong>,而不是其视觉方面。</p></li> <li><p>如果图像既提供信息又具有可操作性,您可以为每个元素添加替代描述 - 但这不是必需的。例如<br> </p></li> </ul> <div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false"><!-- All of these choices lead to the same result. --> <img src=".../Ladybug.jpg" role="presentation"> <img src=".../Ladybug.jpg" role="none"> <img src=".../Ladybug.jpg" aria-hidden="true"> </pre><div class="contentsignin">登录后复制</div></div><div class="contentsignin">登录后复制</div></div> <h3> 复杂图像 </h3> <ul> <li><p>如果图像需要比装饰性、信息性或功能性图像更多的解释(包括信息图表、地图、图形/图表和复杂插图),请使用这些方法中的任何一种来添加替代描述</p></li> <li><p>链接到资源或提供跳转链接到页面稍后的较长说明。例如<br> </p></li> </ul> <div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false"><img src=".../Ladybug_Swarm.jpg" alt="A swarm of red ladybugs is resting on the leaves of my prize rose bush."> </pre><div class="contentsignin">登录后复制</div></div><div class="contentsignin">登录后复制</div></div> <ul> <li>将 aria-scribedby 属性附加到 <img alt="无障碍 (a) 规则 - 3" > 中然后,元素将图像链接到包含较长描述的 ID。例如 </li> </ul> <div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false"><div title="Navigate to the homepage"> <a href="/"> <img src=".../Ladybug_Logo.png" alt="Lovely Ladybugs for your Lawn"/> </a> </div> </pre><div class="contentsignin">登录后复制</div></div> <h3> 替代文本最佳实践 </h3> <ul> <li><p>建议将替代文本限制在 150 个字符或更少,以避免读者疲劳。</p></li> <li><p>避免在说明中使用 <strong>“图像”</strong> 或 <strong>“照片”</strong> 等词语,因为屏幕阅读器会识别这些文件类型。</p></li> <li><p>命名图像时,尽可能保持一致和准确。当替代文本丢失或被忽略时,图像名称是后备。</p></li> <li><p>避免使用非字母字符(例如 #、9、&)</p></li> <li><p>在图像名称或替代文本中使用单词之间的破折号,而不是下划线。</p></li> <li><p>尽可能使用正确的标点符号。如果没有它,图像描述听起来就像是一个漫长的、永无休止的连续句子。</p></li> <li><p>像人类而不是机器人一样编写替代文本。关键字堆砌对任何人都没有好处——使用屏幕阅读器的人会感到恼火,搜索引擎算法会惩罚他们。</p></li> </ul> <p>以上是无障碍 (a) 规则 - 3的详细内容。更多信息请关注PHP中文网其他相关文章!</p> </div> </div> <div style="height: 25px;"> <div style="display: inline-flex;float: right; color:#333333;">来源:dev.to</div> </div> <div class="wzconOtherwz"> <a href="https://www.php.cn/zh/faq/1796689270.html" title="不同浏览器中画布元素的最大尺寸是多少?"> <span>上一篇:不同浏览器中画布元素的最大尺寸是多少?</span> </a> <a href="https://www.php.cn/zh/faq/1796689284.html" 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