Google’s Martin Splitt explains why fragment identifiers don’t get crawled and the importance of href attributes.
The right way to create links. Using the HTML tag with the destination URL in the href attribute is the most straightforward way to create a link. For example, link.
Think twice about fragment identifiers. Fragment identifiers, which are distinguished by a “#” symbol within a URL, point to subsections of a given page, not necessarily a different page. For example, example.com/FAQ#subsection would take the user to a specific point on the page example.com/FAQ.
“Because fragments aren’t meant to point to different content, crawlers ignore them; they just pretend that the fragments don’t exist,” Splitt said. This means that if you build a single-page application with fragment identifiers, crawlers will not follow those links.
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