import.meta.xxx can't be used in markup

**Describe the bug**
In modern JavaScript, `import.meta.xxx` is valid syntax. It parses inside a `<script>`, but not inside markup.

**To Reproduce**
https://svelte.dev/repl/9630de41957a4c80a4fce264360a6bc7?version=3.25.1

**Severity**
Not urgent right now, but likely to become a blocker in the near future.