When you are translating files containing HTML content such as an XLIFF or CSV file, the default settings are not configured to properly extract the content. An option is provided to inform the system that the file contains translatable HTML content. If this File Format Configuration setting is available, you will see an option titled Content is HTML.
When this option is selected, you will see an additional setting for selecting a configuration to use for extracting HTML content. A Default is provided, but you also have the option to create a custom configuration to be used during the translation.
If you do not choose another configuration, then the Default will be used. However, you can also view the default and create a custom one based on more specific translation needs. The following pages will explain what this configuration does and how to view or modify an existing configuration and how to create a new one.