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Detect invalid HTML elements #913

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benglewis opened this issue Nov 12, 2024 · 0 comments · Fixed by #918
Closed

Detect invalid HTML elements #913

benglewis opened this issue Nov 12, 2024 · 0 comments · Fixed by #918
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enhancement New feature or request new rule

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@benglewis
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Motivation

I found that in Svelte 4.0, we had used the following syntax:

<head>
  <script>...</script>
</head>

<svelte:head>
   <title>...</title>
</svelte:head>

<div>
</div>

But it turns out that in Svelte 5.0 (and officially even before Svelte 5.0, even though it worked :P) this is not valid syntax.

Description

The idea is to have a list of Svelte tags (known as "Special elements" in the Svelte docs) which are only supported with the svelte: syntax, e.g. head, body, window, document, element and to automatically notify the user if they are incorrect using these tags without the svelte: prefix. AFAIK, the linter already blocks components from using lower-case names (component-name-lowercase), so I believe that this rule would be exceedingly unlikely to trigger false positives.

Examples

<script>
</script>

<!-- ✓ GOOD -->
<svelte:head>
...
</svelte:head>

<!-- ✗ BAD -->
<head>
...
</head>

Additional comments

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Labels
enhancement New feature or request new rule
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feat: add rule no-deprecated-raw-special-elements mikededo/eslint-plugin-svelte
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@benglewis