屏幕读取器读取替换文字，而图像只占用一个像素的空间。
Screen readers read the alternate text aloud, and the image occupies only one pixel space.
屏幕读取器会读出替换文字，但图像不会打扰该页的可视化流。
Screen readers read the alternate text aloud but the image does not disturb the visual flow of the page.
获取或设置屏幕读取器所读取的隐藏图像的替换文字，以提供跳过链接列表的功能。
The alternate text of a hidden image read by screen readers to provide the ability to skip the list of links.
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