[dajiaohuang]

Summary

• Preserve an explicit newline for a <br> whose previous sibling is also a <br>, including when inline content follows the second break.
• Add an integration regression test comparing rendered heights for one break versus two consecutive breaks.

The existing 02.Line break.htm sample contains consecutive breaks, and its checked-in baseline shows adjacent text lines without an empty line. The parser's correction only materialized a newline for a break at the start of a block or at the end before inline content; a middle consecutive break did not take that path.

Validation

• git diff --check passed.
• Attempted the focused integration test. The .NET 10.0.100 first-run initialized, but restore failed with NU1301 while loading https://api.nuget.org/v3/index.json (Value cannot be null. (Parameter 'path1')). No tests ran; this change is not independently validated yet.