The text that you specify provides assistive technology devices with a description of the hidden skip link image that can be used to make the control more accessible.

指定的文本为辅助技术设备提供了跳过链接隐藏图像的说明，使用这些说明可以使控件更易访问。

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To make that decision as informed as possible, there's also a feature comparison list, so skip along to the source link to get informed.

ENGADGET: Canon Rebel T2i / 550D squares off with EOS 7D in video performance test

While it's possible to skip the sign-in, those who link their account get both cross-platform access to their work as well as cloud-based searches of their more legible writing.

ENGADGET: Evernote intros Penultimate 4 for iPad, explores synced and searchable handwriting