Objects behind "hidden" elements
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If you take a look at this page: http://www.americanmuscle.com/2010-mustang-body-kits.html
You will notice we have a little "Read More" script set up. I have used Google Data Validator to test structured data located behind this 'Read More' and it checks out OK but I was wondering if anyone has insight to whether or not the spiders are even seeing links, etc. behind the 'Read More' script.
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Looks like you've used the right format and that Google will be able to read the text behind the "read more".
You can actually test this by using services that return your website as how the Googlebot sees it. Seo-browser is one of them, and the simple search is free.
Here is the result for that webpage.
You can see the text behind the "read more" script on that page, which would indicate that Google isn't having a problem seeing it.