When most webmasters talk about links, they almost always mean "navigation". There are several ways to connect your pages together so that humans can get from one to the next.
By contrast, there is precisely one way for spiders to get from one page to another and that is the HTML <A> tag. To look at a page in your browser, you will often be unable to tell what navigation is actually spiderable links. That’s one of the primary uses of OptiSpider.
OptiSpider, like the search engines, is only able to follow <A> tags — all other kinds of navigation, like Javascript, and form buttons as two examples, are completely invisible to OptiSpider.
So, if you are uncertain if your navigation is spiderable or not, just run OptiSpider and see which links are found and which are not.
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