Supplementary content sc is usually an important part of a webpage (but is not required for a page to receive a high or even highest rating. true or false
supplementary content sc is usually an important part of a webpage (but is not required for a page to receive a high or even highest rating). true.

True

Explanation:

In a web page, there are two categories of content, they are, the main content and the supplementary content.

The main content holds the needed information of the web page and changes from page to page, while the supplementary content, as the name implies, supports the quality of the main content. It content can be duplicated in multiple pages and does not need a high rating to promote the quality of a web page.