<heading> omitted on rendering

[survellow]

Describe the bug

Using the html5-tag within my document resulted in it disappearing from the rendered output with its contents.

Reproduction

add Test in Vue template

System Info

System:
    OS: macOS 14.5
    CPU: (12) arm64 Apple M3 Pro
    Memory: 223.42 MB / 18.00 GB
    Shell: 5.9 - /bin/zsh
  Binaries:
    Node: 22.2.0 - /opt/homebrew/bin/node
    npm: 10.7.0 - /opt/homebrew/bin/npm
  Browsers:
    Chrome: 126.0.6478.127
    Edge: 126.0.2592.87
    Safari: 17.5
    Safari Technology Preview: 18.0

Used Package Manager

npm

Validations

• [X] Follow our Code of Conduct
• [X] Read the Contributing Guide.
• [X] Check that there isn't already an issue that reports the same bug to avoid creating a duplicate.
• [X] Check that this is a concrete bug. For Q&A, please open a GitHub Discussion instead.
• [X] The provided reproduction is a minimal reproducible of the bug.

Contributions

• [ ] I am willing to submit a PR to fix this issue
• [ ] I am willing to submit a PR with failing tests (actually just go ahead and do it, thanks!)