{@html ...}<tag> fails with NoModificationAllowedError

[Lonami]

Describe the bug
Attempting to write the following:

<p>{@html foo}<br>bar</p>

Will fail with (under Firefox):

NoModificationAllowedError: Modifications are not allowed for this document

However, adding whitespace after the } makes the error disappear, such as a newline or just a space:

<p>{@html foo} <br>bar</p>

Logs

NoModificationAllowedError: Modifications are not allowed for this document (bundle.js:1)

To Reproduce
Please paste the following code into https://svelte.dev/repl:

<script>
	let foo = 'foo<br>bar';
</script>

<p>{@html foo}<br>baz</p>

Expected behavior
It should work, as if I had written the space after the }.

Information about your Svelte project:

• Firefox 68.0.1 (64-bit)
• Linux Mint 19.1 Tessa x86_64, kernel 4.15.0-55-generic
• Svelte version 3.0.0
• Using Webpack

Severity
Low, but can trip other people.

Additional context
Loving this frameless framework :)

[Code0987]

Adding to your bug,
With <p>{@html string}<span>More text!</span></p>
Gives Failed to execute 'insertAdjacentHTML' on 'Element': The element has no parent.
And works normally if I add space after }.

In Chrome 75 / MacOS

[Rich-Harris]

Fixed in 3.7.0 — thanks