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                    标记图形以用于屏幕阅读器软件
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                <div><div class="section"><p>如果希望屏幕阅读器能够说明文档中解释重要概念的图形元素，则必须提供此说明。屏幕阅读器不会识别或读取图形和多媒体，除非将替换文本添加到标签属性中。 </p>
<p>通过 Alt 文本属性可以在查看插图的位置创建可读取的替换文本。ActualText 与 Alt 文本相似，因为它显示在图像的位置。通过 ActualText 属性可以替换单词中的图像部分，例如，当别致的图像用于显示首字下沉效果时。在本例中，ActualText 属性允许将首字下沉字母作为单词的一部分进行读取。</p>
<p>导出为 Adobe PDF 时，Alt 文本和 ActualText 属性值存储在 PDF 文件中，并可以在 Acrobat 6.0 和更高版本中查看。然后，在 Acrobat 中将 PDF 文件存储为 HTML 或 XML 文件时，便可以使用此替换文本信息。有关更多信息，请参见 Adobe Acrobat 文档。</p>
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<ol><li><span>如果需要，请选择“视图”&gt;“显示结构”以显示“结构”窗格，并选择“窗口”&gt;“标签”以显示“标签”面板。</span></li>
<li><span>从“结构”窗格菜单中选择“添加未添加标签的项目”。</span></li>
<li><span>要确保图像被标记为“图形”，请选择此图像，然后在“标签”面板中选择“图形”。</span></li>
<li><span>选择“结构”窗格中的“图形”元素，然后从“结构”窗格菜单中选择“新建属性”。</span></li>
<li><span>对于“名称”，请键入 <strong>Alt</strong> 或 <strong>ActualText</strong>（此功能区分大小写）。</span></li>
<li><span>对于“值”，请键入将替代图像显示的文本。</span></li>
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