Detect invalid HTML elements #913
Description
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
No response