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According to a now-public Google Rater Guidelines Document, helpful supplementary content improves Google ranking. Examples include currency converters, loan interest calculators, and interactive recipes.

Citing references and sources, like research papers do, maybe a sign of quality. The Google Quality Guidelines states that reviewers should keep an eye out for sources when looking at certain pages: “This is a topic where expertise and/or authoritative sources are important...”. However, Google has denied that they use external links as a ranking signal.

Using a linked table of contents can help Google better understand your page's content. It can also result in sitelinks.

Images, videos, and other multimedia elements signify quality. One industry study found a correlation between multimedia and rankings:

YouTube videos are definitely given preferential treatment in the SERPs (probably because Google owns it). Search Engine Land found that YouTube.com traffic increased significantly after Google Panda. Many reports have shown that a YouTube page can reach the top of the first Google Search Engine Results Page with highly-targeted keywords in just 15 minutes.

The aforementioned Google Quality Document states that they prefer sites with an “appropriate amount of contact information”. Make sure that your contact information matches your WhoIs information.

The “Terms of Service” page and the “Privacy” Page help tell Google that a site is a trustworthy member of the internet. They may also help improve your site's E-A-T (Expertise, Authority, Trustworthiness).