Describe the bug

Although the rootMargin value in the UseElementVisibilityOptions type appears to support responsiveness, the actual implementation does not take responsiveness into account.
and personally, considering the purpose of this composable, I think it might make more sense not to accept the rootMargin property at all.

On StackBlitz, rootMargin doesn't seem to work correctly—possibly due to viewport issues. I recommend running the reproduction locally for more accurate results.

Reproduction

https://stackblitz.com/edit/vitejs-vite-eeuwym9e

System Info

System:
  OS: Linux 5.0 undefined
  CPU: (8) x64 Intel(R) Core(TM) i9-9880H CPU @ 2.30GHz
  Memory: 0 Bytes / 0 Bytes
  Shell: 1.0 - /bin/jsh
Binaries:
  Node: 20.19.1 - /usr/local/bin/node
  Yarn: 1.22.19 - /usr/local/bin/yarn
  npm: 10.8.2 - /usr/local/bin/npm
  pnpm: 8.15.6 - /usr/local/bin/pnpm
npmPackages:
  @vueuse/core: ^13.6.0 => 13.6.0 
  vue: ^3.5.18 => 3.5.18

Used Package Manager

npm

Validations

• Follow our Code of Conduct
• Read the Contributing Guidelines.
• Read the docs.
• Check that there isn't already an issue that reports the same bug to avoid creating a duplicate.
• Make sure this is a VueUse issue and not a framework-specific issue. For example, if it's a Vue SFC related bug, it should likely be reported to https://github.com/vuejs/core instead.
• Check that this is a concrete bug. For Q&A open a GitHub Discussion.
• The provided reproduction is a minimal reproducible example of the bug.