What problem does this address?

It is difficult to display a lot of grouped content on a page. The only option is to have all the content display at once on a page because there are no core blocks that hide and show content. A lot of third-party blocks do not follow the standards for tabs.

What is your proposed solution?

The proposed solution is to have a core tab block. See the examples from these websites:

• Tabs | Accessibility Guideliens
• 14 Guidelines For Web Site Tabs Usability
• Tabs, Used Right