Errors list:

• Empty body
• Not empty body

• Large page size
• Not large page size

• Charset empty
• Charset exist
• Charset missing
• Charset many tags exist

• Markup Schema.org exist all attributes
• Markup Schema.org exist not all attributes
• Markup Schema.org is missing

• Markup OpenGraph exist all attributes
• Markup OpenGraph exist not all attributes
• Markup OpenGraph is missing

• Markup Twitter Card exist all attributes
• Markup Twitter Card exist not all attributes
• Markup Twitter Card is missing

Depends on domain (hardcoded domain in urls)

• Different links
• External links without nofollow
• External links with nofollow
• Internal links with nofollow
• Internal links without nofollow