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What about SEO? I've noticed a lot of these sites that are rendered client-side start with very little content in the HTML, doesn't this mean the search engines can't read the content?

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According to this other LinkIn blog post, http://engineering.linkedin.com/frontend/leaving-jsps-dust-m... (look for SEO in the comments), they detect cases where the client can't or won't do JS and perform the rendering server-side.

How do they do that? I can't really figure out anything apart checking user agent (for web crawlers?)

you can simply check for the accepts header.

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