WP 6.1 Theme block category 
Markup: HTML Tags and Formatting
Headings Header one Header two Header three Header four Header five Header six Blockquotes Single line blockquote: Stay hungry. Stay...
Markup: Image Alignment
Welcome to image alignment! The best way to demonstrate the ebb and flow of the various image positioning options is...
Markup: Text Alignment
Default This is a paragraph. It should not have any alignment of any kind. It should just flow like you...
Markup: Title With Special Characters ~`!@#$%^&*()-_=+{}[]/\;:'»?,.>
Putting special characters in the title should have no adverse effect on the layout or functionality. Special characters in the...
Markup: Title With Markup
Verify that: The post title renders the word "with" in italics and the word "markup" in bold (and "up" is...
Template: Featured Image (Vertical)
This post should display a featured image, if the theme supports it. Non-square images can provide some unique styling issues....
Template: Featured Image (Horizontal)
This post should display a featured image, if the theme supports it. Non-square images can provide some unique styling issues....
Template: More Tag
This content is before the more tag. Right after this sentence should be a "continue reading" button of some sort...
Template: Excerpt (Defined)
This is the post content. It should be displayed in place of the user-defined excerpt in single-page views.
Template: Excerpt (Generated)
This is the post content. It should be displayed in place of the auto-generated excerpt in single-page views. Archive-index pages...