CommonMark and GitHub Flavored Markdown (GFM) Rendering Interoperability

Maintaining consistent document rendering across different platforms requires understanding the interoperability between the CommonMark specification and GitHub Flavored Markdown (GFM). While GFM is designed as a superset of CommonMark, the behavior of extended syntax varies when processed by engines that only adhere to the base standard.

The primary goal is to ensure that content authored with GFM extensions remains readable and structured when rendered by a strict CommonMark-compliant parser. There is uncertainty regarding how non-GFM engines handle specific extensions like tables, task lists, and strikethrough text without losing the intended semantic structure.

• Does a strict CommonMark parser render GFM tables as literal text or attempt to parse them as standard paragraphs?
• What is the expected rendering behavior for GFM task list checkboxes in a standard CommonMark environment?