Which structured data format closely resembles HTML?

Extensible Markup Language (XML) was adopted from Hypertext Markup Language (HTML) as a storage method for systems to interchange data. YAML Ain't Markup Language (YAML) is a white space–structured file that is also used to store data for the interchange of information. JavaScript Object Notation (JSON) is another structured storage method for data and was originally created for use with JavaScript and gained popularity with other languages. Comma-separated values (CSV) is a flat data storage method that is popular when lists of information must be passed from system to system.