What is the name of a test page with content to check layout?

Question

HTML

What is the correct name for a page with test content to check the layout (examples of finished content, combinations of different elements, elements in different states)? Please provide examples if possible.

Answer 1

Commonly called "test page". No need to look for ready-made solutions, the feature of the test page is to support the syntax that allows you to insert an editor inside your CMS.
Usually these are paragraphs, lists, headings, pictures and tables.

Answer 2

Designed template with test content.
Here's what I'm doing slowly: xmoonlight.github.io