Understanding the <_out> Tag

What is <_out>?

The <_out> tag is a container used by Moby to denote the exact start and end of generated file content. All content within a file generated by Moby must be enclosed within <_out> and </_out> tags to ensure compatibility with system parsing rules.

<_out>
[Your HTML, SVG, or text content here]
</_out>
                

Why is this needed?