地标与跳转链接

为何重要

Landmarks such as <main>, <nav> and <header> let screen-reader users jump straight to sections. A skip link lets keyboard users bypass repeated navigation (WCAG 2.4.1).

如何修复

1. Wrap the primary content in a single <main> element.
2. Add a ‘Skip to content’ link as the first focusable element, visible on focus.

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