Google's spiders prefer you not to try and 'detect' them and serve different content up to them. However, afaik they're fine with this technique (I mean, they e

Google's spiders prefer you not to try and 'detect' them and serve different content up to them. However, afaik they're fine with this technique (I mean, they even provide a spec to do so). See their content guidelines on 'Hidden text and links' [1] > However, not all hidden text is considered deceptive. For example, if your site includes technologies that search engines have difficulty accessing, like JavaScript... [1] - https://support.google.com/webmasters/answer/66353?hl=en https://support.google.com/webmasters/answer/66353?hl=en