Single page application (SPA) frameworks are probably getting the most attention in the JavaScript world in the past years. Handling most of the processing at the client, boiler-plating the content on every page, maintaining the “state”, and omitting the overhead latency on switching pages are just some of its net benefits.
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Many search engines and social networks such as Facebook and Twitter expect plain HTML to utilize the meta tags and relevant page contents. They cannot determine when the JavaScript framework completes rendering the page. As a result, they can only see a very little part of HTML.
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