{expression} is invalid inside (...) since v5.2.8

[sebadob]

Describe the bug

After an npm update (have been using Svelte 5.1.16 before), quite a few components fail to compile with an error message that does not make sense to me. I was able to pin down the version that broke everything for me. It happened with 5.2.8. When I pin the version to =5.2.7, everything is fine, but everything after does not even compile anymore.

{expression} is invalid inside <table>

It makes sense when you for instance put a div inside a td or something like that, which is not allowed by definition, but it don't get the issue in this situation:

<table
        aria-colcount={columnWidths.length}
        aria-rowcount={rowCount}
        style:width
        style:max-width={maxWidth}
>

The error message comes up for style:max-width={maxWidth}. It does not for the shorthand style:width, but it does even here if I use the long syntax style:width={width}. The error only shows up on the very first occurence of the issue, until I resolve this one, so I have no idea what other parts are affected. It might be a rabbit whole. For instance, 3 lines below I am doing something like <tr style:grid-template-columns={gridTemplateColumns()}> which fails as well with the exact same error, if I remove the lines above.

Reproduction

When I get rid of everything else, I am doing the following:

<script lang="ts">
  let {maxWidth}: {maxWidth?: string} = $props();
</script>

<table style:max-width={maxWidth}>
</table>

Logs

No response

System Info

Working:

  System:
    OS: Linux 6.11 Fedora Linux 41 (KDE Plasma)
    CPU: (32) x64 AMD Ryzen 9 9950X 16-Core Processor
    Memory: 40.88 GB / 62.41 GB
    Container: Yes
    Shell: 5.2.32 - /bin/bash
  Binaries:
    Node: 22.11.0 - /usr/bin/node
    npm: 10.9.0 - /usr/bin/npm
  npmPackages:
    svelte: =5.2.7 => 5.2.7 

Broken:

  System:
    OS: Linux 6.11 Fedora Linux 41 (KDE Plasma)
    CPU: (32) x64 AMD Ryzen 9 9950X 16-Core Processor
    Memory: 40.69 GB / 62.41 GB
    Container: Yes
    Shell: 5.2.32 - /bin/bash
  Binaries:
    Node: 22.11.0 - /usr/bin/node
    npm: 10.9.0 - /usr/bin/npm
  npmPackages:
    svelte: ^5.2.8 => 5.2.10

Severity

blocking an upgrade

[dummdidumm]

Came in through #14395

[sebadob]

I can confirm that 5.2.11 fixes all issues for me, thanks a lot!