"这篇博客讨论了HTML5中的`<nav>`元素在现代浏览器中的识别情况，指出虽然大多数浏览器能识别它作为导航元素，但为了确保辅助技术和搜索引擎能更好地理解和解析网页，明确设置`role="navigation"`属性是必要的。这有助于残障用户使用屏幕阅读器等辅助技术，并可能提高搜索引擎的爬取能力。"
It is true that most modern browsers/technologies recognise the HTML5 element as navigation and give it the same attention. But explicitly setting the role="navigation" attribute just makes sure that a lot more technologies can pick it up.
For example screen-readers and other technologies for users with disabilities are very rarely fully standards compliant (especially if they have to work all the way back to IE6 or lower!) so adding the role attributes explicitly always ensures that you cover all your bases for the most users possible.
Also (and this is just a guess) some of the lesser known search engines may not fully recognise HTML5 yet, so adding these roles should help with the sites crawl-ability.
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