fix: ignore props with invalid chars

[farnabaz]

🔗 Linked issue

resolves #283

❓ Type of change

• 📖 Documentation (updates to the documentation or readme)
• 🐞 Bug fix (a non-breaking change that fixes an issue)
• 👌 Enhancement (improving an existing functionality like performance)
• ✨ New feature (a non-breaking change that adds functionality)
• ⚠️ Breaking change (fix or feature that would cause existing functionality to change)

📚 Description

📝 Checklist

• I have linked an issue or discussion.
• I have run pnpm verify and it passes.
• I have updated the documentation accordingly.

[vercel]

The latest updates on your projects. Learn more about Vercel for GitHub.

Project	Deployment	Actions	Updated (UTC)
comark	Ready	Preview	Jul 30, 2026 3:37pm
comark-json-render	Ready	Preview	Jul 30, 2026 3:37pm
comark-nextjs	Ready	Preview	Jul 30, 2026 3:37pm
comark-nuxt	Ready	Preview	Jul 30, 2026 3:37pm
comark-svelte	Ready	Preview	Jul 30, 2026 3:37pm
comark-sveltekit	Ready	Preview	Jul 30, 2026 3:37pm
comark-twoslash	Ready	Preview	Jul 30, 2026 3:37pm
comark-vue	Ready	Preview	Jul 30, 2026 3:37pm

[pkg-pr-new]

Open in StackBlitz

comark

npm i https://pkg.pr.new/comark@298

@comark/angular

npm i https://pkg.pr.new/@comark/angular@298

@comark/ansi

npm i https://pkg.pr.new/@comark/ansi@298

@comark/html

npm i https://pkg.pr.new/@comark/html@298

@comark/nuxt

npm i https://pkg.pr.new/@comark/nuxt@298

@comark/react

npm i https://pkg.pr.new/@comark/react@298

@comark/svelte

npm i https://pkg.pr.new/@comark/svelte@298

@comark/vue

npm i https://pkg.pr.new/@comark/vue@298

commit: e1ddc51

[rock53770]

function isValidAttrName(name) {
  try {
    document.createAttribute(name)
    return true
  } catch {
    return false
  }
}

Is it better to use this as each browser version supports different attributes?

[farnabaz]

@rock53770 document only exists in browser environment but Comark is agnostic and can be run on any environment.
Also this PR makes sure that attributes only include alphabet, numbers, - and _