Version

System:
    OS: macOS 26.4.1
    CPU: (10) arm64 Apple M1 Max
    Memory: 94.75 MB / 32.00 GB
    Shell: 5.9 - /bin/zsh
  Browsers:
    Brave Browser: 114.1.52.117
    Chrome: 147.0.7727.138
    Edge: 146.0.3856.97
    Firefox: 150.0
    Safari: 26.4

Details

The W3 Nu HTML Checker reports errors when checking output from npm run build. rspress should generate HTML that passes validation.

Reproduce link

https://validator.w3.org/nu/?showsource=yes&doc=https%3A%2F%2Frspress.rs%2Fguide%2Fstart%2Fintroduction

Reproduce Steps

The link above submits the rspress Guide's Introduction to the official W3 HTML validator, which reports 10 HTML errors on that page. This is just an example - similar errors are reported for other pages.