<Li> Client - side JavaScript libraries addressing various issues . </Li> <Li> Server - side web frameworks that specialize in the SPA model . </Li> <Li> The evolution of browsers and the HTML5 specification designed for the SPA model . </Li> <P> Because of the lack of JavaScript execution on crawlers of some popular Web search engines, SEO (Search engine optimization) has historically presented a problem for public facing websites wishing to adopt the SPA model . </P>

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